High Resolution Structure of the Phosphohistidine-Activated Form of Escherichia Coli Cofactor-Dependent Phosphoglycerate Mutase.Bond, C.S., White, M.F., Hunter, W.N.
(2001) J Biol Chem 276: 3247
- PubMed: 11038361
- DOI: https://doi.org/10.1074/jbc.M007318200
- Primary Citation of Related Structures:
- PubMed Abstract:
The active conformation of the dimeric cofactor-dependent phosphoglycerate mutase (dPGM) from Escherichia coli has been elucidated by crystallographic methods to a resolution of 1.25 A (R-factor 0.121; R-free 0.168). The active site residue His(10), central in the catalytic mechanism of dPGM, is present as a phosphohistidine with occupancy of 0.28. The structural changes on histidine phosphorylation highlight various features that are significant in the catalytic mechanism. The C-terminal 10-residue tail, which is not observed in previous dPGM structures, is well ordered and interacts with residues implicated in substrate binding; the displacement of a loop adjacent to the active histidine brings previously overlooked residues into positions where they may directly influence catalysis. E. coli dPGM, like the mammalian dPGMs, is a dimer, whereas previous structural work has concentrated on monomeric and tetrameric yeast forms. We can now analyze the sequence differences that cause this variation of quaternary structure.
Wellcome Trust Biocentre, University of Dundee, Dundee DD1 5EH, United Kingdom.