Biology:Alcohol dehydrogenase

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Short description: Group of dehydrogenase enzymes
Alcohol dehydrogenase
Protein ADH5 PDB 1m6h.png
Crystallographic structure of the
homodimer of human ADH5.[1]
Identifiers
EC number1.1.1.1
CAS number9031-72-5
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
Gene OntologyAmiGO / QuickGO

Alcohol dehydrogenases (ADH) (EC 1.1.1.1) are a group of dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of nicotinamide adenine dinucleotide (NAD+) to NADH. In humans and many other animals, they serve to break down alcohols that are otherwise toxic, and they also participate in the generation of useful aldehyde, ketone, or alcohol groups during the biosynthesis of various metabolites. In yeast, plants, and many bacteria, some alcohol dehydrogenases catalyze the opposite reaction as part of fermentation to ensure a constant supply of NAD+.

Evolution

Genetic evidence from comparisons of multiple organisms showed that a glutathione-dependent formaldehyde dehydrogenase, identical to a class III alcohol dehydrogenase (ADH-3/ADH5), is presumed to be the ancestral enzyme for the entire ADH family.[2][3][4] Early on in evolution, an effective method for eliminating both endogenous and exogenous formaldehyde was important and this capacity has conserved the ancestral ADH-3 through time. Gene duplication of ADH-3, followed by series of mutations, led to the evolution of other ADHs.[3][4]

The ability to produce ethanol from sugar (which is the basis of how alcoholic beverages are made) is believed to have initially evolved in yeast. Though this feature is not adaptive from an energy point of view, by making alcohol in such high concentrations so that they would be toxic to other organisms, yeast cells could effectively eliminate their competition. Since rotting fruit can contain more than 4% of ethanol, animals eating the fruit needed a system to metabolize exogenous ethanol. This was thought to explain the conservation of ethanol active ADH in species other than yeast, though ADH-3 is now known to also have a major role in nitric oxide signaling.[5][6]

In humans, sequencing of the ADH1B gene (responsible for production of an alcohol dehydrogenase polypeptide) shows several functional variants. In one, there is a SNP (single nucleotide polymorphism) that leads to either a Histidine or an Arginine residue at position 47 in the mature polypeptide. In the Histidine variant, the enzyme is much more effective at the aforementioned conversion.[7] The enzyme responsible for the conversion of acetaldehyde to acetate, however, remains unaffected, which leads to differential rates of substrate catalysis and causes a buildup of toxic acetaldehyde, causing cell damage.[7] This provides some protection against excessive alcohol consumption and alcohol dependence (alcoholism).[8][9][10][11] Various haplotypes arising from this mutation are more concentrated in regions near Eastern China, a region also known for its low alcohol tolerance and dependence.

A study was conducted in order to find a correlation between allelic distribution and alcoholism, and the results suggest that the allelic distribution arose along with rice cultivation in the region between 12,000 and 6,000 years ago.[12] In regions where rice was cultivated, rice was also fermented into ethanol.[12] This led to speculation that increased alcohol availability led to alcoholism and abuse, resulting in lower reproductive fitness.[12] Those with the variant allele have little tolerance for alcohol, thus lowering chance of dependence and abuse.[7][12] The hypothesis posits that those individuals with the Histidine variant enzyme were sensitive enough to the effects of alcohol that differential reproductive success arose and the corresponding alleles were passed through the generations. Classical Darwinian evolution would act to select against the detrimental form of the enzyme (Arg variant) because of the lowered reproductive success of individuals carrying the allele. The result would be a higher frequency of the allele responsible for the His-variant enzyme in regions that had been under selective pressure the longest. The distribution and frequency of the His variant follows the spread of rice cultivation to inland regions of Asia, with higher frequencies of the His variant in regions that have cultivated rice the longest.[7] The geographic distribution of the alleles seems to therefore be a result of natural selection against individuals with lower reproductive success, namely, those who carried the Arg variant allele and were more susceptible to alcoholism.[13] However, the persistence of the Arg variant in other populations argues that the effect could not be strong.

Discovery

Horse LADH (Liver Alcohol Dehydrogenase)

The first-ever isolated alcohol dehydrogenase (ADH) was purified in 1937 from Saccharomyces cerevisiae (brewer's yeast).[14] Many aspects of the catalytic mechanism for the horse liver ADH enzyme were investigated by Hugo Theorell and coworkers.[15] ADH was also one of the first oligomeric enzymes that had its amino acid sequence and three-dimensional structure determined.[16][17][18]

In early 1960, the alcohol dehydrogenase (ADH) gene was discovered in fruit flies of the genus Drosophila melanogaster.[19] Flies that are mutant for ADH cannot breakdown alcohols into aldehydes and ketones.[20] While ethanol produced by decaying fruit is a natural food source and location for oviposit for Drosophila at low concentrations (<4%), high concentrations of ethanol can induce oxidative stress and alcohol intoxication.[21] Drosophila's fitness is elevated by consuming the low concentration of ethanol. Initial exposure to ethanol causes hyperactivity, followed by incoordination and sedation.[22] Further research has shown that the antioxidant alpha-ketoglutarate may be beneficial in reducing the oxidative stress produced by alcohol consumption. A 2016 study concluded that food supplementation with 10-mM alpha-ketoglutarate decreased Drosophila alcohol sensitivity over time.[23] For the gene that codes for ADH, there are 194 known classic and insertion alleles.[24] Two alleles that are commonly used for experimentation involving ethanol toxicity and response are ADHs (slow) and ADHF (fast). Numerous experiments have concluded that the two alleles account for the differences in enzymatic activity for each. In comparing Adh-F homozygotes (wild-type) and Adh- nulls (homozygous null), research has shown that Adh- nulls have a lower level of tolerance for ethanol, starting the process of intoxication earlier than its counter partner.[22] Other experiments have also concluded that the Adh allele is haplosufficient. Haplosuffiency means that having one functioning allele will be adequate in producing the needed phenotypes for survival. That means that flies that were heterozygous for the Adh allele (one copy of the Adh null allele and one copy of the Adh Wild type allele) gave very similar phenotypical alcohol tolerance as the homozygous dominant flies (two copies of the wild type Adh allele).[21] Regardless of genotype, Drosophila show a negative response to exposure to samples with an ethanol content above 5%, which render any tolerance inadequate, resulting in a lethal dosage and a mortality rate of around 70%.[25] Drosophila show many of the same ethanol responses as humans do. Low doses of ethanol produce hyperactivity, moderate doses incoordination, and high doses sedation.[26]

Properties

The alcohol dehydrogenases comprise a group of several isozymes that catalyse the oxidation of primary and secondary alcohols to aldehydes and ketones, respectively, and also can catalyse the reverse reaction.[19] In mammals this is a redox (reduction/oxidation) reaction involving the coenzyme nicotinamide adenine dinucleotide (NAD+).

Mechanism of action in humans

Steps

  1. Binding of the coenzyme NAD+
  2. Binding of the alcohol substrate by coordination to zinc(II) ion
  3. Deprotonation of His-51
  4. Deprotonation of nicotinamide ribose
  5. Deprotonation of Thr-48
  6. Deprotonation of the alcohol
  7. Hydride transfer from the alkoxide ion to NAD+, leading to NADH and a zinc-bound aldehyde or ketone
  8. Release of aldehyde.

The mechanism in yeast and bacteria is the reverse of this reaction. These steps are supported through kinetic studies.[27]

Involved subunits

The substrate is coordinated to the zinc and this enzyme has two zinc atoms per subunit. One is the active site, which is involved in catalysis. In the active site, the ligands are Cys-46, Cys-174, His-67, and one water molecule. The other subunit is involved with structure. In this mechanism, the hydride from the alcohol goes to NAD+. Crystal structures indicate that the His-51 deprotonates the nicotinamide ribose, which deprotonates Ser-48. Finally, Ser-48 deprotonates the alcohol, making it an aldehyde.[27] From a mechanistic perspective, if the enzyme adds hydride to the re face of NAD+, the resulting hydrogen is incorporated into the pro-R position. Enzymes that add hydride to the re face are deemed Class A dehydrogenases.

Active site

The active site of alcohol dehydrogenase

The active site of human ADH1 (PDB:1HSO) consists of a zinc atom, His-67, Cys-174, Cys-46, Thr-48, His-51, Ile-269, Val-292, Ala-317, and Phe-319. In the commonly studied horse liver isoform, Thr-48 is a Ser, and Leu-319 is a Phe. The zinc coordinates the substrate (alcohol). The zinc is coordinated by Cys-46, Cys-174, and His-67. Leu-319, Ala-317, His-51, Ile-269 and Val-292 stabilize NAD+ by forming hydrogen bonds. His-51 and Ile-269 form hydrogen bonds with the alcohols on nicotinamide ribose. Phe-319, Ala-317 and Val-292 form hydrogen bonds with the amide on NAD+.[27]

Structural zinc site

The structural zinc binding motif in alcohol dehydrogenase from an MD simulation

Mammalian alcohol dehydrogenases also have a structural zinc site. This Zn ion plays a structural role and is crucial for protein stability. The structures of the catalytic and structural zinc sites in horse liver alcohol dehydrogenase (HLADH) as revealed in crystallographic structures, which has been studied computationally with quantum chemistry as well as with classical molecular dynamics methods. The structural zinc site is composed of four closely spaced cysteine ligands (Cys97, Cys100, Cys103, and Cys111 in the amino acid sequence) positioned in an almost symmetric tetrahedron around the Zn ion. A recent study showed that the interaction between zinc and cysteine is governed by primarily an electrostatic contribution with an additional covalent contribution to the binding.[28]

Types

Human

In humans, ADH exists in multiple forms as a dimer and is encoded by at least seven genes. Among the five classes (I-V) of alcohol dehydrogenase, the hepatic forms that are used primarily in humans are class 1. Class 1 consists of α, β, and γ subunits that are encoded by the genes ADH1A, ADH1B, and ADH1C.[29][30] The enzyme is present at high levels in the liver and the lining of the stomach.[31] It catalyzes the oxidation of ethanol to acetaldehyde (ethanal):

CH3CH2OH + NAD+ → CH3CHO + NADH + H+

This allows the consumption of alcoholic beverages, but its evolutionary purpose is probably the breakdown of alcohols naturally contained in foods or produced by bacteria in the digestive tract.[32]

Another evolutionary purpose is reversible metabolism of retinol (vitamin A), an alcohol, to retinaldehyde, also known as retinal, which is then irreversibly converted into retinoic acid, which regulates expression of hundreds of genes.[33][34][35]

alcohol dehydrogenase 1A,
α polypeptide
Identifiers
SymbolADH1A
Alt. symbolsADH1
NCBI gene124
HGNC249
OMIM103700
RefSeqNM_000667
UniProtP07327
Other data
EC number1.1.1.1
LocusChr. 4 q23
alcohol dehydrogenase 1B,
β polypeptide
Identifiers
SymbolADH1B
Alt. symbolsADH2
NCBI gene125
HGNC250
OMIM103720
RefSeqNM_000668
UniProtP00325
Other data
EC number1.1.1.1
LocusChr. 4 q23
alcohol dehydrogenase 1C,
γ polypeptide
Identifiers
SymbolADH1C
Alt. symbolsADH3
NCBI gene126
HGNC251
OMIM103730
RefSeqNM_000669
UniProtP00326
Other data
EC number1.1.1.1
LocusChr. 4 q23

Alcohol dehydrogenase is also involved in the toxicity of other types of alcohol: For instance, it oxidizes methanol to produce formaldehyde and ultimately formic acid.[36] Humans have at least six slightly different alcohol dehydrogenases. Each is a dimer (i.e., consists of two polypeptides), with each dimer containing two zinc ions Zn2+. One of those ions is crucial for the operation of the enzyme: It is located at the catalytic site and holds the hydroxyl group of the alcohol in place. [citation needed]

Alcohol dehydrogenase activity varies between men and women, between young and old, and among populations from different areas of the world. For example, young women are unable to process alcohol at the same rate as young men because they do not express the alcohol dehydrogenase as highly, although the inverse is true among the middle-aged.[37] The level of activity may not be dependent only on level of expression but also on allelic diversity among the population.

The human genes that encode class II, III, IV, and V alcohol dehydrogenases are ADH4, ADH5, ADH7, and ADH6, respectively.

alcohol dehydrogenase 4
(class II), π polypeptide
Identifiers
SymbolADH4
NCBI gene127
HGNC252
OMIM103740
RefSeqNM_000670
UniProtP08319
Other data
EC number1.1.1.1
LocusChr. 4 q22
alcohol dehydrogenase 5
(class III), χ polypeptide
Identifiers
SymbolADH5
NCBI gene128
HGNC253
OMIM103710
RefSeqNM_000671
UniProtP11766
Other data
EC number1.1.1.1
LocusChr. 4 q23
alcohol dehydrogenase 6
(class V)
Identifiers
SymbolADH6
NCBI gene130
HGNC255
OMIM103735
RefSeqNM_000672
UniProtP28332
Other data
EC number1.1.1.1
LocusChr. 4 q23
alcohol dehydrogenase 7
(class IV), μ or σ polypeptide
Identifiers
SymbolADH7
NCBI gene131
HGNC256
OMIM600086
RefSeqNM_000673
UniProtP40394
Other data
EC number1.1.1.1
LocusChr. 4 q23-q24

Yeast and bacteria

Unlike humans, yeast and bacteria (except lactic acid bacteria, and E. coli in certain conditions) do not ferment glucose to lactate. Instead, they ferment it to ethanol and CO
2. The overall reaction can be seen below:

Glucose + 2 ADP + 2 Pi → 2 ethanol + 2 CO2 + 2 ATP + 2 H2O[38]
Alcohol Dehydrogenase

In yeast[39] and many bacteria, alcohol dehydrogenase plays an important part in fermentation: Pyruvate resulting from glycolysis is converted to acetaldehyde and carbon dioxide, and the acetaldehyde is then reduced to ethanol by an alcohol dehydrogenase called ADH1. The purpose of this latter step is the regeneration of NAD+, so that the energy-generating glycolysis can continue. Humans exploit this process to produce alcoholic beverages, by letting yeast ferment various fruits or grains. Yeast can produce and consume their own alcohol.

The main alcohol dehydrogenase in yeast is larger than the human one, consisting of four rather than just two subunits. It also contains zinc at its catalytic site. Together with the zinc-containing alcohol dehydrogenases of animals and humans, these enzymes from yeasts and many bacteria form the family of "long-chain"-alcohol dehydrogenases.

Brewer's yeast also has another alcohol dehydrogenase, ADH2, which evolved out of a duplicate version of the chromosome containing the ADH1 gene. ADH2 is used by the yeast to convert ethanol back into acetaldehyde, and it is expressed only when sugar concentration is low. Having these two enzymes allows yeast to produce alcohol when sugar is plentiful (and this alcohol then kills off competing microbes), and then continue with the oxidation of the alcohol once the sugar, and competition, is gone.[40]

Plants

In plants, ADH catalyses the same reaction as in yeast and bacteria to ensure that there is a constant supply of NAD+. Maize has two versions of ADH - ADH1 and ADH2, Arabidopsis thaliana contains only one ADH gene. The structure of Arabidopsis ADH is 47%-conserved, relative to ADH from horse liver. Structurally and functionally important residues, such as the seven residues that provide ligands for the catalytic and noncatalytic zinc atoms, however, are conserved, suggesting that the enzymes have a similar structure.[41] ADH is constitutively expressed at low levels in the roots of young plants grown on agar. If the roots lack oxygen, the expression of ADH increases significantly.[42] Its expression is also increased in response to dehydration, to low temperatures, and to abscisic acid, and it plays an important role in fruit ripening, seedlings development, and pollen development.[43] Differences in the sequences of ADH in different species have been used to create phylogenies showing how closely related different species of plants are.[44] It is an ideal gene to use due to its convenient size (2–3 kb in length with a ≈1000 nucleotide coding sequence) and low copy number.[43]

Iron-containing

Iron-containing alcohol dehydrogenase
PDB 1jqa EBI.jpg
bacillus stearothermophilus glycerol dehydrogenase complex with glycerol
Identifiers
SymbolFe-ADH
PfamPF00465
Pfam clanCL0224
InterProIPR001670
PROSITEPDOC00059
SCOP21jqa / SCOPe / SUPFAM

A third family of alcohol dehydrogenases, unrelated to the above two, are iron-containing ones. They occur in bacteria and fungi. In comparison to enzymes the above families, these enzymes are oxygen-sensitive.[citation needed] Members of the iron-containing alcohol dehydrogenase family include:

Other types

A further class of alcohol dehydrogenases belongs to quinoenzymes and requires quinoid cofactors (e.g., pyrroloquinoline quinone, PQQ) as enzyme-bound electron acceptors. A typical example for this type of enzyme is methanol dehydrogenase of methylotrophic bacteria.

Applications

In biotransformation, alcohol dehydrogenases are often used for the synthesis of enantiomerically pure stereoisomers of chiral alcohols. Often, high chemo- and enantioselectivity can be achieved. One example is the alcohol dehydrogenase from Lactobacillus brevis (LbADH), which is described to be a versatile biocatalyst.[52] The high chemospecificity has been confirmed also in the case of substrates presenting two potential redox sites. For instance cinnamaldehyde presents both aliphatic double bond and aldehyde function. Unlike conventional catalysts, alcohol dehydrogenases are able to selectively act only on the latter, yielding exclusively cinnamyl alcohol.[53]

In fuel cells, alcohol dehydrogenases can be used to catalyze the breakdown of fuel for an ethanol fuel cell. Scientists at Saint Louis University have used carbon-supported alcohol dehydrogenase with poly(methylene green) as an anode, with a nafion membrane, to achieve about 50 μA/cm2.[54]

In 1949, E. Racker defined one unit of alcohol dehydrogenase activity as the amount that causes a change in optical density of 0.001 per minute under the standard conditions of assay.[55] Recently, the international definition of enzymatic unit (E.U.) has been more common: one unit of Alcohol Dehydrogenase will convert 1.0 μmole of ethanol to acetaldehyde per minute at pH 8.8 at 25 °C.[56]

Clinical significance

Alcoholism

There have been studies showing that variations in ADH that influence ethanol metabolism have an impact on the risk of alcohol dependence.[8][9][10][11][57] The strongest effect is due to variations in ADH1B that increase the rate at which alcohol is converted to acetaldehyde. One such variant is most common in individuals from East Asia and the Middle East, another is most common in individuals from Africa.[9] Both variants reduce the risk for alcoholism, but individuals can become alcoholic despite that. Researchers have tentatively detected a few other genes to be associated with alcoholism, and know that there must be many more remaining to be found.[58] Research continues in order to identify the genes and their influence on alcoholism.

Drug dependence

Drug dependence is another problem associated with ADH, which researchers think might be linked to alcoholism. One particular study suggests that drug dependence has seven ADH genes associated with it, however, more research is necessary.[59] Alcohol dependence and other drug dependence may share some risk factors, but because alcohol dependence is often comorbid with other drug dependences, the association of ADH with the other drug dependencies may not be causal.

Poisoning

Fomepizole, a drug that competitively inhibits alcohol dehydrogenase, can be used in the setting of acute methanol[60] or ethylene glycol[61] toxicity. This prevents the conversion of the methanol or ethylene glycol to its toxic metabolites (such as formic acid, formaldehyde, or glycolate). The same effect is also sometimes achieved with ethanol, again by competitive inhibition of ADH.

Drug metabolism

The drug hydroxyzine is broken into its active metabolite cetirizine by alcohol dehydrogenase. Other drugs with alcohol groups may be metabolized in a similar way as long as steric hindrance does not prevent the alcohol from reaching the active site.[62]

See also

References

This article incorporates text from the public domain Pfam and InterPro: IPR001670
  1. ↑ PDB: 1m6h​; "Human glutathione-dependent formaldehyde dehydrogenase. Structures of apo, binary, and inhibitory ternary complexes". Biochemistry 41 (35): 10778–86. September 2002. doi:10.1021/bi0257639. PMID 12196016. 
  2. ↑ "Purification, characterization, and partial sequence of the glutathione-dependent formaldehyde dehydrogenase from Escherichia coli: a class III alcohol dehydrogenase". Biochemistry 31 (2): 475–81. January 1992. doi:10.1021/bi00117a025. PMID 1731906. 
  3. ↑ 3.0 3.1 ""Enzymogenesis": classical liver alcohol dehydrogenase origin from the glutathione-dependent formaldehyde dehydrogenase line". Proceedings of the National Academy of Sciences of the United States of America 89 (19): 9247–51. October 1992. doi:10.1073/pnas.89.19.9247. PMID 1409630. Bibcode: 1992PNAS...89.9247D. 
  4. ↑ 4.0 4.1 "Medium- and short-chain dehydrogenase/reductase gene and protein families : the MDR superfamily". Cellular and Molecular Life Sciences 65 (24): 3879–94. December 2008. doi:10.1007/s00018-008-8587-z. PMID 19011751. 
  5. ↑ "Medium- and short-chain dehydrogenase/reductase gene and protein families : Dual functions of alcohol dehydrogenase 3: implications with focus on formaldehyde dehydrogenase and S-nitrosoglutathione reductase activities". Cellular and Molecular Life Sciences 65 (24): 3950–60. December 2008. doi:10.1007/s00018-008-8592-2. PMID 19011746. 
  6. ↑ "S-Nitrosogluthathione reductase activity of amphioxus ADH3: insights into the nitric oxide metabolism". International Journal of Biological Sciences 2 (3): 117–24. 2006. doi:10.7150/ijbs.2.117. PMID 16763671. 
  7. ↑ 7.0 7.1 7.2 7.3 "ADH and ALDH genotypes in relation to alcohol metabolic rate and sensitivity". Alcohol and Alcoholism 2: 59–65. 1994. PMID 8974317. http://152.98.160.29/contents/p/staff/JW058.pdf. [yes|permanent dead link|dead link}}]
  8. ↑ 8.0 8.1 "Alcohol and aldehyde dehydrogenase genotypes and alcoholism in Chinese men". American Journal of Human Genetics 48 (4): 677–81. April 1991. PMID 2014795. 
  9. ↑ 9.0 9.1 9.2 "Alcohol dehydrogenases, aldehyde dehydrogenases and alcohol use disorders: a critical review". Alcoholism: Clinical and Experimental Research 42 (12): 2281–2297. October 2018. doi:10.1111/acer.13904. PMID 30320893. 
  10. ↑ 10.0 10.1 "Genes encoding enzymes involved in ethanol metabolism". Alcohol Research 34 (3): 339–44. 2012. PMID 23134050. 
  11. ↑ 11.0 11.1 "Transancestral GWAS of alcohol dependence reveals common genetic underpinnings with psychiatric disorders". Nature Neuroscience 21 (12): 1656–1669. December 2018. doi:10.1038/s41593-018-0275-1. PMID 30482948. 
  12. ↑ 12.0 12.1 12.2 12.3 "The ADH1B Arg47His polymorphism in east Asian populations and expansion of rice domestication in history". BMC Evolutionary Biology 10 (1): 15. January 2010. doi:10.1186/1471-2148-10-15. PMID 20089146. Bibcode: 2010BMCEE..10...15P. 
  13. ↑ "Alcohol Research and Health". Alcohol Health & Research World (U.S. Government Printing Office). 2007-01-01. ISSN 1535-7414. 
  14. ↑ "Diphosphopyridinproteid ackohol, acetaldehyd". Biochem. Z. 293: 351. 1937. 
  15. ↑ "Mechanism of action of liver alcohol dehydrogenase". Nature 192 (4797): 47–50. October 1961. doi:10.1038/192047a0. PMID 13920552. Bibcode: 1961Natur.192...47T. 
  16. ↑ "Horse liver alcohol dehydrogenase. On the primary structure of the ethanol-active isoenzyme". European Journal of Biochemistry 13 (3): 565–76. April 1970. doi:10.1111/j.1432-1033.1970.tb00962.x. PMID 5462776. 
  17. ↑ "Structure of liver alcohol dehydrogenase at 2.9-angstrom resolution". Proceedings of the National Academy of Sciences of the United States of America 70 (8): 2439–42. August 1973. doi:10.1073/pnas.70.8.2439. PMID 4365379. Bibcode: 1973PNAS...70.2439B. 
  18. ↑ Enzymatic studies of alcohol dehydrogenase by a combination of in vitro and in silico methods, PhD thesis. Stockholm, Sweden: Karolinska Institutet. 2009. p. 70. ISBN 978-91-7409-567-8. http://diss.kib.ki.se/2009/978-91-7409-567-8/thesis.pdf. 
  19. ↑ 19.0 19.1 "Analysis of alcohol dehydrogenase gene expression in Drosophila". Annual Review of Genetics 21: 203–25. 1987. doi:10.1146/annurev.ge.21.120187.001223. PMID 3327463. 
  20. ↑ "Drosophila melanogaster alcohol dehydrogenase: mechanism of aldehyde oxidation and dismutation". The Biochemical Journal 329 (Pt 3): 561–70. February 1998. doi:10.1042/bj3290561. PMID 9445383. 
  21. ↑ 21.0 21.1 "The influence of Adh function on ethanol preference and tolerance in adult Drosophila melanogaster". Chemical Senses 35 (9): 813–22. November 2010. doi:10.1093/chemse/bjq084. PMID 20739429. 
  22. ↑ 22.0 22.1 "Genetics and genomics of alcohol responses in Drosophila". Neuropharmacology 122: 22–35. August 2017. doi:10.1016/j.neuropharm.2017.01.032. PMID 28161376. 
  23. ↑ "Alpha-ketoglutarate reduces ethanol toxicity in Drosophila melanogaster by enhancing alcohol dehydrogenase activity and antioxidant capacity". Alcohol 55: 23–33. September 2016. doi:10.1016/j.alcohol.2016.07.009. PMID 27788775. 
  24. ↑ "FlyBase Gene Report: Dmel\Adh". http://flybase.org/reports/FBgn0000055#alleles_main_sub. 
  25. ↑ "Ecological Niche Difference Associated with Varied Ethanol Tolerance between Drosophila suzukii and Drosophila melanogaster (Diptera: Drosophilidae)". Florida Entomologist 101 (3): 498–504. September 2018. doi:10.1653/024.101.0308. ISSN 0015-4040. 
  26. ↑ "Deletion of a conserved regulatory element in the Drosophila Adh gene leads to increased alcohol dehydrogenase activity but also delays development". Genetics 156 (1): 219–27. September 2000. doi:10.1093/genetics/156.1.219. PMID 10978287. PMC 1461225. http://www.genetics.org/content/156/1/219. 
  27. ↑ 27.0 27.1 27.2 "Relating protein motion to catalysis". Annual Review of Biochemistry 75: 519–41. 2006. doi:10.1146/annurev.biochem.75.103004.142800. PMID 16756501. 
  28. ↑ "Molecular dynamics study of zinc binding to cysteines in a peptide mimic of the alcohol dehydrogenase structural zinc site". Physical Chemistry Chemical Physics 11 (6): 975–83. February 2009. doi:10.1039/b815482a. PMID 19177216. Bibcode: 2009PCCP...11..975B. https://zenodo.org/record/996012. 
  29. ↑ "Incorporation of the genetic control of alcohol dehydrogenase into a physiologically based pharmacokinetic model for ethanol in humans". Toxicological Sciences 78 (1): 20–31. March 2004. doi:10.1093/toxsci/kfh057. PMID 14718645. 
  30. ↑ "Alcohol Dehydrogenases, Aldehyde Dehydrogenases, and Alcohol Use Disorders: A Critical Review". Alcoholism: Clinical and Experimental Research 42 (12): 2281–2297. December 2018. doi:10.1111/acer.13904. PMID 30320893. 
  31. ↑ "Alcohol dehydrogenase of class IV (sigma sigma-ADH) from human stomach. cDNA sequence and structure/function relationships". European Journal of Biochemistry 224 (2): 549–57. September 1994. doi:10.1111/j.1432-1033.1994.00549.x. PMID 7925371. 
  32. ↑ "Alcohol and Nutrition". MedicineNet, Inc.. http://www.medicinenet.com/alcohol_and_nutrition/article.htm. 
  33. ↑ "Retinoic acid synthesis and signaling during early organogenesis". Cell 134 (6): 921–31. September 2008. doi:10.1016/j.cell.2008.09.002. PMID 18805086. 
  34. ↑ "Alcohol dehydrogenase 2 is a major hepatic enzyme for human retinol metabolism". Cellular and Molecular Life Sciences 64 (4): 498–505. February 2007. doi:10.1007/s00018-007-6449-8. PMID 17279314. 
  35. ↑ "Vitamin A". Present Knowledge in Nutrition, Eleventh Edition. London, United Kingdom: Academic Press (Elsevier). 2020. pp. 73–92. ISBN 978-0-323-66162-1. 
  36. ↑ "Methanol Toxicity". StatPearls. Treasure Island (FL): StatPearls Publishing. 2020. http://www.ncbi.nlm.nih.gov/books/NBK482121/. Retrieved 2020-11-06. 
  37. ↑ "Gastric alcohol dehydrogenase activity in man: influence of gender, age, alcohol consumption and smoking in a caucasian population". Alcohol and Alcoholism 37 (4): 388–93. 2002. doi:10.1093/alcalc/37.4.388. PMID 12107043. 
  38. ↑ Lehninger Principles of Biochemistry. San Francisco: W. H. Freeman. 2005. p. 180. ISBN 978-0-7167-4339-2. https://archive.org/details/lehningerprincip00lehn_0/page/180. 
  39. ↑ "The three zinc-containing alcohol dehydrogenases from baker's yeast, Saccharomyces cerevisiae". FEMS Yeast Research 2 (4): 481–94. December 2002. doi:10.1111/j.1567-1364.2002.tb00116.x. PMID 12702265. 
  40. ↑ "Festive special: The brewer's tale - life". New Scientist. 23 December 2006. https://www.newscientist.com/channel/life/mg19225831.100-festive-special-the-brewers-tale.html. Retrieved 2009-04-27. 
  41. ↑ "Molecular cloning and DNA sequence of the Arabidopsis thaliana alcohol dehydrogenase gene". Proceedings of the National Academy of Sciences of the United States of America 83 (5): 1408–12. March 1986. doi:10.1073/pnas.83.5.1408. PMID 2937058. Bibcode: 1986PNAS...83.1408C. 
  42. ↑ "Arabidopsis alcohol dehydrogenase expression in both shoots and roots is conditioned by root growth environment". Plant Physiology 121 (2): 429–36. October 1999. doi:10.1104/pp.121.2.429. PMID 10517834. 
  43. ↑ 43.0 43.1 "Evaluation of the impact of functional diversification on Poaceae, Brassicaceae, Fabaceae, and Pinaceae alcohol dehydrogenase enzymes". Journal of Molecular Modeling 16 (5): 919–28. May 2010. doi:10.1007/s00894-009-0576-0. PMID 19834749. 
  44. ↑ "Phylogenetic relationships of Betula species (Betulaceae) based on nuclear ADH and chloroplast matK sequences". American Journal of Botany 91 (11): 1834–45. November 2004. doi:10.3732/ajb.91.11.1834. PMID 21652331. 
  45. ↑ "Homology of Saccharomyces cerevisiae ADH4 to an iron-activated alcohol dehydrogenase from Zymomonas mobilis". Molecular & General Genetics 209 (2): 374–81. September 1987. doi:10.1007/bf00329668. PMID 2823079. 
  46. ↑ "Cloning and sequencing of the alcohol dehydrogenase II gene from Zymomonas mobilis". Journal of Bacteriology 169 (6): 2591–7. June 1987. doi:10.1128/jb.169.6.2591-2597.1987. PMID 3584063. 
  47. ↑ "Similarity of Escherichia coli propanediol oxidoreductase (fucO product) and an unusual alcohol dehydrogenase from Zymomonas mobilis and Saccharomyces cerevisiae". Journal of Bacteriology 171 (7): 3754–9. July 1989. doi:10.1128/jb.171.7.3754-3759.1989. PMID 2661535. 
  48. ↑ "Molecular characterization of two Clostridium acetobutylicum ATCC 824 butanol dehydrogenase isozyme genes". Journal of Bacteriology 174 (22): 7149–58. November 1992. doi:10.1128/jb.174.22.7149-7158.1992. PMID 1385386. 
  49. ↑ "Pyruvate-formate-lyase-deactivase and acetyl-CoA reductase activities of Escherichia coli reside on a polymeric protein particle encoded by adhE". FEBS Letters 281 (1–2): 59–63. April 1991. doi:10.1016/0014-5793(91)80358-A. PMID 2015910. 
  50. ↑ "Mapping and cloning of gldA, the structural gene of the Escherichia coli glycerol dehydrogenase". Journal of Bacteriology 176 (6): 1796–800. March 1994. doi:10.1128/jb.176.6.1796-1800.1994. PMID 8132480. 
  51. ↑ "Cloning, expression, and sequence analysis of the Bacillus methanolicus C1 methanol dehydrogenase gene". Journal of Bacteriology 174 (16): 5346–53. August 1992. doi:10.1128/jb.174.16.5346-5353.1992. PMID 1644761. 
  52. ↑ "Alcohol dehydrogenase from Lactobacillus brevis: A versatile catalyst for enenatioselective reduction". CABEQ: 267–281. 2011. http://www.hdki.hr/cabeq/pdf/25_2_2011/Cabeq_2011_02_13.pdf. [yes|permanent dead link|dead link}}]
  53. ↑ "Cofactor recycling for selective enzymatic biotransformation of cinnamaldehyde to cinnamyl alcohol". Bioscience, Biotechnology, and Biochemistry 73 (5): 1224–6. May 2009. doi:10.1271/bbb.90025. PMID 19420690. 
  54. ↑ "Microchip-based ethanol/oxygen biofuel cell". Lab on a Chip 5 (2): 218–25. February 2005. doi:10.1039/b412719f. PMID 15672138. 
  55. ↑ "Crystalline alcohol dehydrogenase from baker's yeast". The Journal of Biological Chemistry 184 (1): 313–9. May 1950. doi:10.1016/S0021-9258(19)51151-6. PMID 15443900. 
  56. ↑ "Enzymatic Assay of Alcohol Dehydrogenase (EC 1.1.1.1)". Sigma Aldrich. http://www.sigmaaldrich.com/technical-documents/protocols/biology/enzymatic-assay-of-alcohol-dehydrogenase.html. 
  57. ↑ "Genome-Wide Association Study Meta-Analysis of the Alcohol Use Disorders Identification Test (AUDIT) in Two Population-Based Cohorts". The American Journal of Psychiatry 176 (2): 107–118. February 2019. doi:10.1176/appi.ajp.2018.18040369. PMID 30336701. 
  58. ↑ "Genome-wide association study of alcohol consumption and use disorder in 274,424 individuals from multiple populations". Nature Communications 10 (1): 1499. April 2019. doi:10.1038/s41467-019-09480-8. PMID 30940813. Bibcode: 2019NatCo..10.1499K. 
  59. ↑ "Multiple ADH genes modulate risk for drug dependence in both African- and European-Americans". Human Molecular Genetics 16 (4): 380–90. February 2007. doi:10.1093/hmg/ddl460. PMID 17185388. 
  60. ↑ International Programme on Chemical Safety (IPCS): Methanol (PIM 335), [1], retrieved on 1 March 2008
  61. ↑ "Ethylene glycol ingestion treated only with fomepizole". Journal of Medical Toxicology 3 (3): 125–8. September 2007. doi:10.1007/BF03160922. PMID 18072148. 
  62. ↑ "Chapter 36: Nonsteroidal anti-inflammatory drugs". Foye's Principles of Medicinal Chemistry (7th ed.). Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. 2013. ISBN 978-1-60913-345-0. 

External links

  • PDBsum has links to three-dimensional structures of various alcohol dehydrogenases contained in the Protein Data Bank
  • ExPASy contains links to the alcohol dehydrogenase sequences in Swiss-Prot, to a Medline literature search about the enzyme, and to entries in other databases.
  • PDBe-KB provides an overview of all the structure information available in the PDB for Alcohol dehydrogenase 1A.
  • PDBe-KB provides an overview of all the structure information available in the PDB for Alcohol dehydrogenase 1B.
  • PDBe-KB provides an overview of all the structure information available in the PDB for Alcohol dehydrogenase 1C.
  • PDBe-KB provides an overview of all the structure information available in the PDB for Alcohol dehydrogenase 4.
  • PDBe-KB provides an overview of all the structure information available in the PDB for Alcohol dehydrogenase class-3.



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