Biology:Taurine dioxygenase
| taurine dioxygenase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 1.14.11.17 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
In enzymology, a taurine dioxygenase (EC 1.14.11.17) is an enzyme that catalyzes the chemical reaction.
- taurine + 2-oxoglutarate + O2 [math]\displaystyle{ \rightleftharpoons }[/math] sulfite + aminoacetaldehyde + succinate + CO2
The 3 substrates of this enzyme are taurine, 2-oxoglutarate, and O2, whereas its 4 products are sulfite, aminoacetaldehyde, succinate, and CO2.[1]
This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with 2-oxoglutarate as one donor, and incorporation of one atom o oxygen into each donor. The systematic name of this enzyme class is taurine, 2-oxoglutarate:O2 oxidoreductase (sulfite-forming). Other names in common use include 2-aminoethanesulfonate dioxygenase, and alpha-ketoglutarate-dependent taurine dioxygenase. This enzyme participates in taurine and hypotaurine metabolism. It has 3 cofactors: iron, Ascorbate, and Fe2+.
Structural studies
As of late 2007, 4 structures have been solved for this class of enzymes, with PDB accession codes 1GQW, 1GY9, 1OS7, and 1OTJ.
Mechanism
Initiating steps
In the decomposition of taurine, it has been shown that molecular oxygen is activated by Iron II, which lies in the coordinating complex of taurine dioxygenase.[2] Here the enzyme with conjunction of an Iron II and 2-oxoglutarate maintain non-covalent bonds by electrostatic interactions, and coordinate a nucleophilic attack from dioxygen on 2-oxoglutarate carbon number 2.[3] This leads to the two oxidations, one on 2-oxoglutarate, and another on taurine, each one electron.
References
- ↑ "X-ray crystal structure of Escherichia coli taurine/alpha-ketoglutarate dioxygenase complexed to ferrous iron and substrates". Biochemistry 41 (16): 5185–5192. April 2002. doi:10.1021/bi016014e. PMID 11955067.
- ↑ "Interconversion of two oxidized forms of taurine/α-ketoglutarate dioxygenase, a non-heme iron hydroxylase: Evidence for bicarbonate binding". Proceedings of the National Academy of Sciences of the United States of America 100 (7): 3790–3795. April 2003. doi:10.1073/pnas.0636740100. PMID 12642663.
- ↑ "Characteristics and biotechnology applications of aliphatic amino acid hydroxylases belonging to the Fe(II)/α-ketoglutarate-dependent dioxygenase superfamily". Applied Microbiology and Biotechnology 98 (9): 3869–3876. May 2014. doi:10.1007/s00253-014-5620-z. PMID 24682483.
Further reading
- "Characterization of alpha-ketoglutarate-dependent taurine dioxygenase from Escherichia coli". The Journal of Biological Chemistry 272 (37): 23031–23036. September 1997. doi:10.1074/jbc.272.37.23031. PMID 9287300.
 |  |
