4UAP image
Entry Detail
PDB ID:
4UAP
Title:
X-ray structure of GH31 CBM32-2 bound to GalNAc
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-08-11
Release Date:
2015-10-07
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.19
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glycosyl hydrolase, family 31/fibronectin type III domain protein
Chain IDs:A, B
Chain Length:152
Number of Molecules:2
Biological Source:Clostridium perfringens
Primary Citation
Diverse modes of galacto-specific carbohydrate recognition by a family 31 glycoside hydrolase from Clostridium perfringens.
PLoS ONE 12 e0171606 e0171606 (2017)
PMID: 28158290 DOI: 10.1371/journal.pone.0171606

Abstact

Clostridium perfringens is a commensal member of the human gut microbiome and an opportunistic pathogen whose genome encodes a suite of putative large, multi-modular carbohydrate-active enzymes that appears to play a role in the interaction of the bacterium with mucin-based carbohydrates. Among the most complex of these is an enzyme that contains a presumed catalytic module belonging to glycoside hydrolase family 31 (GH31). This large enzyme, which based on its possession of a GH31 module is a predicted α-glucosidase, contains a variety of non-catalytic ancillary modules, including three CBM32 modules that to date have not been characterized. NMR-based experiments demonstrated a preference of each module for galacto-configured sugars, including the ability of all three CBM32s to recognize the common mucin monosaccharide GalNAc. X-ray crystal structures of the CpGH31 CBM32s, both in apo form and bound to GalNAc, revealed the finely-tuned molecular strategies employed by these sequentially variable CBM32s in coordinating a common ligand. The data highlight that sequence similarities to previously characterized CBMs alone are insufficient for identifying the molecular mechanism of ligand binding by individual CBMs. Furthermore, the overlapping ligand binding profiles of the three CBMs provide a fail-safe mechanism for the recognition of GalNAc among the dense eukaryotic carbohydrate networks of the colonic mucosa. These findings expand our understanding of ligand targeting by large, multi-modular carbohydrate-active enzymes, and offer unique insights into of the expanding ligand-binding preferences and binding site topologies observed in CBM32s.

Legend

Protein

Chemical

Disease

Primary Citation of related structures