4-hydroxythreonine-4-phosphate dehydrogenase
| 4-hydroxythreonine-4-phosphate dehydrogenase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 1.1.1.262 | ||||||||
| 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 | ||||||||
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In enzymology, a 4-hydroxythreonine-4-phosphate dehydrogenase (EC 1.1.1.262) is an enzyme that catalyzes the chemical reaction
- 4-phosphonooxy-L-threonine + NAD+ (2S)-2-amino-3-oxo-4-phosphonooxybutanoate + NADH + H+
Thus, the two substrates of this enzyme are 4-phosphonooxy-L-threonine and NAD+, whereas its 3 products are (2S)-2-amino-3-oxo-4-phosphonooxybutanoate, NADH, and H+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 4-phosphonooxy-L-threonine:NAD+ oxidoreductase. Other names in common use include NAD+-dependent threonine 4-phosphate dehydrogenase, L-threonine 4-phosphate dehydrogenase, 4-(phosphohydroxy)-L-threonine dehydrogenase, PdxA, and 4-(phosphonooxy)-L-threonine:NAD+ oxidoreductase. This enzyme participates in vitamin B6 metabolism.
Structural studies
As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes 1PS6, 1PS7, 1PTM, 1R8K, 1YXO, and 2HI1.
References
- ID; Hsiung, Yuju; Cornish, Julie A.; Robinson, J. Kenneth; Spenser, Ian D. (1998). "Biosynthesis of vitamine B6: The oxidation of L-threonine 4-phosphate by PdxA". J. Am. Chem. Soc. 120 (8): 1936&ndash, 1937. doi:10.1021/ja9742085.
- Laber B, Maurer W, Scharf S, Stepusin K, Schmidt FS (1999). "Vitamin B6 biosynthesis: formation of pyridoxine 5'-phosphate from 4-(phosphohydroxy)-L-threonine and 1-deoxy-D-xylulose-5-phosphate by PdxA and PdxJ protein". FEBS Lett. 449 (1): 45&ndash, 8. doi:10.1016/S0014-5793(99)00393-2. PMID 10225425.
- Sivaraman J, Li Y, Banks J, Cane DE, Matte A, Cygler M (2003). "Crystal structure of Escherichia coli PdxA, an enzyme involved in the pyridoxal phosphate biosynthesis pathway". J. Biol. Chem. 278 (44): 43682&ndash, 90. doi:10.1074/jbc.M306344200. PMID 12896974.