6HMG image
Entry Detail
PDB ID:
6HMG
Keywords:
Title:
Structure of the GH99 endo-alpha-mannanase from Bacteroides xylanisolvens in complex with alpha-Glc-1,3-(1,2-anhydro-carba-glucosamine)
Biological Source:
PDB Version:
Deposition Date:
2018-09-12
Release Date:
2018-09-26
Method Details:
Experimental Method:
Resolution:
1.27 Å
R-Value Free:
0.15
R-Value Work:
0.13
R-Value Observed:
0.13
Space Group:
I 4
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glycosyl hydrolase family 71
Chain IDs:A
Chain Length:385
Number of Molecules:1
Biological Source:Bacteroides xylanisolvens XB1A
Primary Citation
From 1,4-Disaccharide to 1,3-Glycosyl Carbasugar: Synthesis of a Bespoke Inhibitor of Family GH99 Endo-alpha-mannosidase.
Org.Lett. 20 7488 7492 (2018)
PMID: 30427198 DOI: 10.1021/acs.orglett.8b03260

Abstact

Understanding the enzyme reaction mechanism can lead to the design of enzyme inhibitors. A Claisen rearrangement was used to allow conversion of an α-1,4-disaccharide into an α-1,3-linked glycosyl carbasugar to target the endo-α-mannosidase from the GH99 glycosidase family, which, unusually, is believed to act through a 1,2-anhydrosugar "epoxide" intermediate. Using NMR and X-ray crystallography, it is shown that glucosyl carbasugar α-aziridines can act as reasonably potent endo-α-mannosidase inhibitors, likely by virtue of their shape mimicry and the interactions of the aziridine nitrogen with the conserved catalytic acid/base of the enzyme active site.

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