2XEC image
Entry Detail
PDB ID:
2XEC
Keywords:
ISOMERASE
Title:
Nocardia farcinica maleate cis-trans isomerase bound to TRIS
Biological Source:
Source Organism:
NOCARDIA FARCINICA
Host Organism:
ESCHERICHIA COLI
PDB Version:
Deposition Date:
2010-05-13
Release Date:
2010-08-18
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.20 Å
R-Value Free:
0.28
R-Value Work:
0.23
R-Value Observed:
0.24
Space Group:
P 21 21 21
2XEC validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:PUTATIVE MALEATE ISOMERASE
Chain IDs:A, B, C, D
Chain Length:273
Number of Molecules:4
Biological Source:NOCARDIA FARCINICA
UniProt ID:Q5YXQ1 Pfam ID:PF17645 EC:5.2.1.1
Ligand Molecules
CA
TRS
Primary Citation
A Covalent Succinylcysteine-Like Intermediate in the Enzyme-Catalyzed Transformation of Maleate to Fumarate by Maleate Isomerase.
J.Am.Chem.Soc. 132 11455 ? (2010)
PMID: 20677745 DOI: 10.1021/JA1053576

Abstact

Maleate isomerase (MI), a member of the Asp/Glu racemase superfamily, catalyzes cis-trans isomerization of the C2-C3 double bond in maleate to yield fumarate. Mutational studies, in conjunction with the structure of the C194A mutant of Nocardia farcinica MI cocrystallized with maleate, have revealed an unprecedented mode of catalysis for the superfamily in which the isomerization reaction is initiated by nucleophilic attack of cysteine at the double bond, yielding a covalent succinylcysteine-like intermediate.

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Primary Citation of related structures
2XEC