Chemistry:Allysine
Allysine is a derivative of lysine that features a formyl group in place of the terminal amine. The free amino acid does not exist, but the allysine residue does. It is produced by aerobic oxidation of lysine residues by the enzyme lysyl oxidase. The transformation is an example of a post-translational modification. The semialdehyde form exists in equilibrium with a cyclic derivative.[1]
Biochemical reactions
Allysine is linked to L-lysine in reactions catalysed by saccharopine dehydrogenases. These interconvert them via saccharopine:[2][3][4]
Allysine is involved in the production of elastin and collagen.[5] Increased allysine concentration in tissues has been correlated to the presence of fibrosis.[6]
Allysine residues react with sodium 2-naphthol-6-sulfonate to produce a fluorescent bis-naphtol-allysine product.[7] In another assay, allysine-containing proteins are reduced with sodium borohydride to give a peptide containing the 6-hydroxynorleucine (6-hydroxy-2-aminocaproic acid) residue, which (unlike allysine) is stable to proteolysis.[1]
References
- ↑ 1.0 1.1 Requena, J. R.; Levine, R. L.; Stadtman, E. R. (2003). "Recent Advances in the Analysis of Oxidized Proteins". Amino Acids 25 (3–4): 221–226. doi:10.1007/s00726-003-0012-1. PMID 14661085.
- ↑ "Saccharopine dehydrogenase. Interaction with substrate analogues". Eur. J. Biochem. 25 (2): 301–7. 1972. doi:10.1111/j.1432-1033.1972.tb01697.x. PMID 4339117.
- ↑ "Saccharopine, an intermediate of the aminoadipic acid pathway of lysine biosynthesis. IV. Saccharopine dehydrogenase". J. Biol. Chem. 241 (14): 3435–40. 1966. doi:10.1016/S0021-9258(18)96483-5. PMID 4287986.
- ↑ "Chemical mechanism of saccharopine reductase from Saccharomyces cerevisiae". Biochemistry 48 (25): 5899–907. June 2009. doi:10.1021/bi900599s. PMID 19449898.
- ↑ Eyre, David R.; Paz, Mercedes A.; Gallop, Paul M. (1984). "Cross-Linking in Collagen and Elastin". Annual Review of Biochemistry 53: 717–748. doi:10.1146/annurev.bi.53.070184.003441. PMID 6148038.
- ↑ "68Ga-NODAGA-Indole: An Allysine-Reactive Positron Emission Tomography Probe for Molecular Imaging of Pulmonary Fibrogenesis". Journal of the American Chemical Society 141 (14): 5593–5596. April 2019. doi:10.1021/jacs.8b12342. PMID 30908032.
- ↑ "High sensitivity HPLC method for determination of the allysine concentration in tissue by use of a naphthol derivative". Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences 1064: 7–13. October 2017. doi:10.1016/j.jchromb.2017.08.032. PMID 28886479.
Further reading
- "Formation of allysine in β-lactoglobulin and myofibrillar proteins by glyoxal and methylglyoxal: Impact on water-holding capacity and in vitro digestibility". Food Chemistry 271: 87–93. January 2019. doi:10.1016/j.foodchem.2018.07.167. PMID 30236745.
- "Allysine and α-Aminoadipic Acid as Markers of the Glyco-Oxidative Damage to Human Serum Albumin under Pathological Glucose Concentrations". Antioxidants 10 (3): 474. March 2021. doi:10.3390/antiox10030474. PMID 33802856.
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