7ZON image
Entry Detail
PDB ID:
7ZON
Keywords:
Title:
Carbohydrate binding domain CBM92-B from a multi-catalytic glucanase-chitinase from Chitinophaga pinensis DSM 2588 in complex with glucose
Biological Source:
PDB Version:
Deposition Date:
2022-04-26
Release Date:
2023-05-10
Method Details:
Experimental Method:
Resolution:
1.77 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glycoside hydrolase family 18
Chain IDs:A, B
Chain Length:147
Number of Molecules:2
Biological Source:Chitinophaga pinensis DSM 2588
Primary Citation
Structural and biochemical analysis of family 92 carbohydrate-binding modules uncovers multivalent binding to beta-glucans.
Nat Commun 15 3429 3429 (2024)
PMID: 38653764 DOI: 10.1038/s41467-024-47584-y

Abstact

Carbohydrate-binding modules (CBMs) are non-catalytic proteins found appended to carbohydrate-active enzymes. Soil and marine bacteria secrete such enzymes to scavenge nutrition, and they often use CBMs to improve reaction rates and retention of released sugars. Here we present a structural and functional analysis of the recently established CBM family 92. All proteins analysed bind preferentially to β-1,6-glucans. This contrasts with the diversity of predicted substrates among the enzymes attached to CBM92 domains. We present crystal structures for two proteins, and confirm by mutagenesis that tryptophan residues permit ligand binding at three distinct functional binding sites on each protein. Multivalent CBM families are uncommon, so the establishment and structural characterisation of CBM92 enriches the classification database and will facilitate functional prediction in future projects. We propose that CBM92 proteins may cross-link polysaccharides in nature, and might have use in novel strategies for enzyme immobilisation.

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