Download MendeleyCrystal structure of human phosphoglucose isomerase and analysis of the initial catalytic steps
Cordeiro, A.T., Godoi, P.H.C., Silva, C.H.T.P., Garratt, R.C., Oliva, G., Thiemann, O.H.(2003) Biochim Biophys Acta 1645: 117-122
- PubMed: 12573240
- DOI: https://doi.org/10.1016/s1570-9639(02)00464-8
- Primary Citation of Related Structures:
1JLH - PubMed Abstract:
The second enzyme in the glycolytic pathway, phosphoglucose isomerase (PGI), catalyses an intracellular aldose-ketose isomerization. Here we describe the human recombinant PGI structure (hPGI) solved in the absence of active site ligands. Crystals isomorphous to those previously reported were used to collect a 94% complete data set to a limiting resolution of 2.1 A. From the comparison between the free active site hPGI structure and the available human and rabbit PGI (rPGI) structures, a mechanism for protein initial catalytic steps is proposed. Binding of the phosphate moiety of the substrate to two distinct elements of the active site is responsible for driving a series of structural changes resulting in the polarisation of the active site histidine, priming it for the initial ring-opening step of catalysis.
Organizational Affiliation:
Laboratory of Protein Crystallography and Structural Biology, Physics Institute of São Carlos, University of São Paulo-USP, Av Trabalhador Sãocarlense 400, PO Box 369, 13566-590 São Carlos-SP, Brazil.
