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Research article2024Peer reviewedOpen access

The first crystal structure of a family 45 glycoside hydrolase from a brown-rot fungus, Gloeophyllum trabeum GtCel45A

Okmane, Laura; Fitkin, Louise; Sandgren, Mats; Stahlberg, Jerry


Here we describe the first crystal structure of a beta-1,4-endoglucanase from a brown-rot fungus, Gloeophyllum trabeum GtCel45A, which belongs to subfamily C of glycoside hydrolase family 45 (GH45). GtCel45A is similar to 18 kDa in size and the crystal structure contains 179 amino acids. The structure is refined at 1.30 angstrom resolution and R-free 0.18. The enzyme consists of a single catalytic module folded into a six-stranded double-psi beta-barrel domain surrounded by long loops. GtCel45A is very similar in sequence (82% identity) and structure to PcCel45A from the white-rot fungus Phanerochaete chrysosporium. Surprisingly though, initial hydrolysis of barley beta-glucan was almost twice as fast in GtCel45A as compared to PcCel45A.


Cel45A; cellulase; cellulose; endoglucanase; glycoside hydrolase GH45

Published in

FEBS open bio
2024, Volume: 14, number: 3, pages: 505-514
Publisher: WILEY