1FRO image
Deposition Date 1997-02-25
Release Date 1997-06-16
Last Version Date 2024-02-07
Entry Detail
PDB ID:
1FRO
Title:
HUMAN GLYOXALASE I WITH BENZYL-GLUTATHIONE INHIBITOR
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.23
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 43
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:LACTOYLGLUTATHIONE LYASE
Gene (Uniprot):GLO1
Chain IDs:A, B, C, D
Chain Length:183
Number of Molecules:4
Biological Source:Homo sapiens
Primary Citation
Crystal structure of human glyoxalase I--evidence for gene duplication and 3D domain swapping.
EMBO J. 16 3386 3395 (1997)
PMID: 9218781 DOI: 10.1093/emboj/16.12.3386

Abstact

The zinc metalloenzyme glyoxalase I catalyses the glutathione-dependent inactivation of toxic methylglyoxal. The structure of the dimeric human enzyme in complex with S-benzyl-glutathione has been determined by multiple isomorphous replacement (MIR) and refined at 2.2 A resolution. Each monomer consists of two domains. Despite only low sequence homology between them, these domains are structurally equivalent and appear to have arisen by a gene duplication. On the other hand, there is no structural homology to the 'glutathione binding domain' found in other glutathione-linked proteins. 3D domain swapping of the N- and C-terminal domains has resulted in the active site being situated in the dimer interface, with the inhibitor and essential zinc ion interacting with side chains from both subunits. Two structurally equivalent residues from each domain contribute to a square pyramidal coordination of the zinc ion, rarely seen in zinc enzymes. Comparison of glyoxalase I with other known structures shows the enzyme to belong to a new structural family which includes the Fe2+-dependent dihydroxybiphenyl dioxygenase and the bleomycin resistance protein. This structural family appears to allow members to form with or without domain swapping.

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