6D41 image
Entry Detail
PDB ID:
6D41
Keywords:
Title:
Bacteriodes uniformis beta-glucuronidase 1 bound to D-glucaro-1,5-lactone
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2018-04-17
Release Date:
2018-10-17
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.16
R-Value Work:
0.13
R-Value Observed:
0.14
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Beta-galactosidase/beta-glucuronidase
Chain IDs:A (auth: B), B (auth: A)
Chain Length:603
Number of Molecules:2
Biological Source:Bacteroides uniformis
Primary Citation
Three structurally and functionally distinct beta-glucuronidases from the human gut microbeBacteroides uniformis.
J. Biol. Chem. 293 18559 18573 (2018)
PMID: 30301767 DOI: 10.1074/jbc.RA118.005414

Abstact

The glycoside hydrolases encoded by the human gut microbiome play an integral role in processing a variety of exogenous and endogenous glycoconjugates. Here we present three structurally and functionally distinct β-glucuronidase (GUS) glycoside hydrolases from a single human gut commensal microbe, Bacteroides uniformis We show using nine crystal structures, biochemical, and biophysical data that whereas these three proteins share similar overall folds, they exhibit different structural features that create three structurally and functionally unique enzyme active sites. Notably, quaternary structure plays an important role in creating distinct active site features that are hard to predict via structural modeling methods. The enzymes display differential processing capabilities toward glucuronic acid-containing polysaccharides and SN-38-glucuronide, a metabolite of the cancer drug irinotecan. We also demonstrate that GUS-specific and nonselective inhibitors exhibit varying potencies toward each enzyme. Together, these data highlight the diversity of GUS enzymes within a single Bacteroides gut commensal and advance our understanding of how structural details impact the specific roles microbial enzymes play in processing drug-glucuronide and glycan substrates.

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