Structural highlights
Function
MPI_CANAL Involved in the synthesis of the GDP-mannose and dolichol-phosphate-mannose required for a number of critical mannosyl transfer reactions.
Publication Abstract from PubMed
Type I phosphomannose isomerases (PMIs) are zinc-dependent monofunctional metalloenzymes catalyzing the reversible isomerization of d-mannose 6-phosphate to d-fructose 6-phosphate. 5-Phospho-d-arabinonhydrazide (5PAHz), designed as an analogue of the enediolate high-energy intermediate, strongly inhibits PMI from Candida albicans (CaPMI). In this study, we report the 3D crystal structure of CaPMI complexed with 5PAHz at 1.85 A resolution. The high-resolution structure suggests that Glu294 is the catalytic base that transfers a proton between the C1 and C2 carbon atoms of the substrate. Bidentate coordination of the inhibitor explains the stereochemistry of the isomerase activity, as well as the absence of both anomerase and C2-epimerase activities for Type I PMIs. A detailed mechanism of the reversible isomerization is proposed. This article is protected by copyright. All rights reserved.
Crystal Structure of Phosphomannose Isomerase from Candida albicans Complexed with 5-Phospho-d-Arabinonhydrazide.,Ahmad L, Plancqueel S, Dubosclard V, Lazar N, Ghattas W, Li de la Sierra-Gallay I, van Tilbeurgh H, Salmon L FEBS Lett. 2018 Apr 23. doi: 10.1002/1873-3468.13059. PMID:29687459[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Ahmad L, Plancqueel S, Dubosclard V, Lazar N, Ghattas W, Li de la Sierra-Gallay I, van Tilbeurgh H, Salmon L. Crystal Structure of Phosphomannose Isomerase from Candida albicans Complexed with 5-Phospho-d-Arabinonhydrazide. FEBS Lett. 2018 Apr 23. doi: 10.1002/1873-3468.13059. PMID:29687459 doi:http://dx.doi.org/10.1002/1873-3468.13059
