CATH Classification

Domain Context

CATH Clusters

Superfamily Aspartate Aminotransferase, domain 1
Functional Family Phosphoserine aminotransferase

Enzyme Information

2.6.1.52
Phosphoserine transaminase.
based on mapping to UniProt Q96255
(1) O-phospho-L-serine + 2-oxoglutarate = 3-phosphonooxypyruvate + L-glutamate. (2) 4-phosphonooxy-L-threonine + 2-oxoglutarate = (3R)-3-hydroxy-2-oxo-4- phosphonooxybutanoate + L-glutamate.
-!- Catalyzes the second step in the phosphorylated pathway of serine biosynthesis in Escherichia coli. -!- Also catalyzes the third step in the biosynthesis of the coenzyme pyridoxal 5'-phosphate in E.coli (using reaction 2 above). -!- In E.coli, pyridoxal 5'-phosphate is synthesized de novo by a pathway that involves EC 1.2.1.72, EC 1.1.1.290, EC 2.6.1.52, EC 1.1.1.262, EC 2.6.99.2 and EC 1.4.3.5 (with pyridoxine 5'-phosphate as substrate). -!- Pyridoxal phosphate is the cofactor for both activities and therefore seems to be involved in its own biosynthesis. -!- Non-phosphorylated forms of serine and threonine are not substrates.

UniProtKB Entries (1)

Q96255
SERB1_ARATH
Arabidopsis thaliana
Phosphoserine aminotransferase 1, chloroplastic

PDB Structure

PDB 6CZX
External Links
Method X-RAY DIFFRACTION
Organism
Primary Citation
Structural Analysis of Phosphoserine Aminotransferase (Isoform 1) FromArabidopsis thaliana- the Enzyme Involved in the Phosphorylated Pathway of Serine Biosynthesis.
Sekula, B., Ruszkowski, M., Dauter, Z.
Front Plant Sci