9FDL image
Entry Detail
PDB ID:
9FDL
Title:
Crystal structure of the catalytic domain of an AA9 lytic polysaccharide monooxygenase from Thermothelomyces thermophilus (TtLPMO9F)
Biological Source:
PDB Version:
Deposition Date:
2024-05-17
Release Date:
2024-12-25
Method Details:
Experimental Method:
Resolution:
2.33 Å
R-Value Free:
0.20
R-Value Work:
0.16
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glycoside hydrolase family 61 protein
Chain IDs:A, B, C
Chain Length:230
Number of Molecules:3
Biological Source:Thermothelomyces thermophilus ATCC 42464
Primary Citation
Mutational study of a lytic polysaccharide monooxygenase from Myceliophthora thermophila (MtLPMO9F): Structural insights into substrate specificity and regioselectivity.
Int.J.Biol.Macromol. 288 138574 138574 (2024)
PMID: 39662565 DOI: 10.1016/j.ijbiomac.2024.138574

Abstact

Lytic polysaccharide monooxygenases (LPMOs) are key enzymes for the biotechnological exploitation of lignocellulosic biomass, yet their efficient application depends on the in-depth understanding of their mechanism of action. Here, we describe the structural and mutational characterization of a C4-active LPMO from Myceliophthora thermophila, MtLPMO9F, that belongs to auxiliary activity family 9 (AA9). MtLPMO9F is active on cellulose, cello-oligosaccharides and xyloglucan. The crystal structure of MtLPMO9F catalytic domain, determined at 2.3 Å resolution, revealed a double conformation for loop L3 with a potential implication in the formation of aglycon subsites. Product analysis of reactions with cello-oligosaccharides showed a prevalent -4 to +2 binding mode. Subsequent biochemical characterization of 4 MtLPMO9F point mutants further provided insights in LPMO structure-function relationships regarding both substrate binding and the role of second-coordination sphere residues.

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