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Crystal structure of a putative exo‐β‐1,3‐galactanase from Bifidobacterium bifidum S17
Author(s) -
Godoy Andre S.,
de Lima Mariana Z. T.,
Camilo Cesar M.,
Polikarpov Igor
Publication year - 2016
Publication title -
acta crystallographica section f
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 37
ISSN - 2053-230X
DOI - 10.1107/s2053230x16003617
Subject(s) - bifidobacterium bifidum , bifidobacterium , crystal (programming language) , chemistry , crystallography , biology , biochemistry , computer science , fermentation , lactobacillus , programming language
Given the current interest in second‐generation biofuels, carbohydrate‐active enzymes have become the most important tool to overcome the structural recalcitrance of the plant cell wall. While some glycoside hydrolase families have been exhaustively described, others remain poorly characterized, especially with regard to structural information. The family 43 glycoside hydrolases are a diverse group of inverting enzymes; the available structure information on these enzymes is mainly from xylosidases and arabinofuranosidase. Currently, only one structure of an exo‐β‐1,3‐galactanase is available. Here, the production, crystallization and structure determination of a putative exo‐β‐1,3‐galactanase from Bifidobacterium bifidum S17 ( Bb Gal43A) are described. Bb Gal43A was successfully produced and showed activity towards synthetic galactosides. Bb Gal43A was subsequently crystallized and data were collected to 1.4 Å resolution. The structure shows a single‐domain molecule, differing from known homologues, and crystal contact analysis predicts the formation of a dimer in solution. Further biochemical studies are necessary to elucidate the differences between Bb Gal43A and its characterized homologues.