2ZPU image
Entry Detail
PDB ID:
2ZPU
Keywords:
Title:
Crystal Structure of Modified Serine Racemase from S.pombe.
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2008-07-29
Release Date:
2009-04-28
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.20
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Uncharacterized protein C320.14
Chain IDs:A
Chain Length:323
Number of Molecules:1
Biological Source:Schizosaccharomyces pombe
Primary Citation
Serine racemase with catalytically active lysinoalanyl residue.
J.Biochem. 145 421 424 (2009)
PMID: 19155267 DOI: 10.1093/jb/mvp010

Abstact

Serine racemase synthesizes d-serine, a physiological agonist of the NMDA receptor in mammalian brains. Schizosaccharomyces pombe produces serine racemase (spSR) that is highly similar to the brain enzyme. Our mass-spectrometric and X-ray studies revealed that spSR is modified with its natural substrate serine. spSR remains partially active even though its essential Lys57 inherently forming a Schiff base with the coenzyme pyridoxal 5'-phosphate is converted to N(6)-(R-2-amino-2-carboxyethyl)-l-lysyl (lysino-d-alanyl) residue. This indicates that the alpha-amino group of the d-alanyl moiety of the lysino-d-alanyl residue serves as a catalytic base in the same manner as the epsilon-amino group of Lys57 of the original spSR.

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Primary Citation of related structures