Download MendeleySolution structure of Escherichia coli glutaredoxin-2 shows similarity to mammalian glutathione-S-transferases.
Xia, B., Vlamis-Gardikas, A., Holmgren, A., Wright, P.E., Dyson, H.J.(2001) J Mol Biol 310: 907-918
- PubMed: 11453697
- DOI: https://doi.org/10.1006/jmbi.2001.4721
- Primary Citation of Related Structures:
1G7O - PubMed Abstract:
Glutaredoxin 2 (Grx2) from Escherichia coli is distinguished from other glutaredoxins by its larger size, low overall sequence identity and lack of electron donor activity with ribonucleotide reductase. However, catalysis of glutathione (GSH)-dependent general disulfide reduction by Grx2 is extremely efficient. The high-resolution solution structure of E. coli Grx2 shows a two-domain protein, with residues 1 to 72 forming a classical "thioredoxin-fold" glutaredoxin domain, connected by an 11 residue linker to the highly helical C-terminal domain, residues 84 to 215. The active site, Cys9-Pro10-Tyr11-Cys12, is buried in the interface between the two domains, but Cys9 is solvent-accessible, consistent with its role in catalysis. The structures reveal the hither to unknown fact that Grx2 is structurally similar to glutathione-S-transferases (GST), although there is no obvious sequence homology. The similarity of these structures gives important insights into the functional significance of a new class of mammalian GST-like proteins, the single-cysteine omega class, which have glutaredoxin oxidoreductase activity rather than GSH-S-transferase conjugating activity. E. coli Grx 2 is structurally and functionally a member of this new expanding family of large glutaredoxins. The primary function of Grx2 as a GST-like glutaredoxin is to catalyze reversible glutathionylation of proteins with GSH in cellular redox regulation including stress responses.
Organizational Affiliation:
Department of Molecular Biology and Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
