Open AccessThree‐dimensional structure of a thermophilic family GH11 xylanase from Thermobifida fusca
Author(s) -
Lammerts van Bueren Alicia,
Otani Suzie,
Friis Esben P.,
Wilson Keith S.,
Davies Gideon J.
Publication year - 2012
Publication title -
acta crystallographica section f
Language(s) - English
Resource type - Journals
ISSN - 1744-3091
DOI - 10.1107/s1744309111049608
Subject(s) - xylanase , thermophile , hydrogen bond , xylan , ligand (biochemistry) , chemistry , thermal stability , bioorganic chemistry , enzyme , covalent bond , stereochemistry , crystallography , organic chemistry , biochemistry , molecule , receptor
Thermostable enzymes employ various structural features dictated at the amino‐acid sequence level that allow them to maintain their integrity at higher temperatures. Many hypotheses as to the nature of thermal stability have been proposed, including optimized core hydrophobicity and an increase in charged surface residues to enhance polar solvent interactions for solubility. Here, the three‐dimensional structure of the family GH11 xylanase from the moderate thermophile Thermobifida fusca in its trapped covalent glycosyl‐enzyme intermediate complex is presented. Interactions with the bound ligand show fewer direct hydrogen bonds from ligand to protein than observed in previous complexes from other species and imply that binding of the xylan substrate involves several water‐mediated hydrogen bonds.