Insights into an unusual Auxiliary Activity 9 family member lacking the histidine brace motif of lytic polysaccharide monooxygenases
Journal Article
·
· Journal of Biological Chemistry
- Univ. of Copenhagen (Denmark); Aix-Marseille Univ., Marseille (France)
- Novozymes, Bagsvaerd (Denmark)
- Aix-Marseille Univ., Marseille (France)
- Univ. of Leeds (United Kingdom); Univ. of York (United Kingdom)
- Univ. of Oxford (United Kingdom)
- Univ. of Surrey, Guildford (United Kingdom)
- Univ. of Copenhagen (Denmark)
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Univ. of California, Berkeley, CA (United States)
- Univ. of Copenhagen (United Kingdom)
- Aix-Marseille Univ., Marseille (France); INRA, Marseille (France); King Abdulaziz Univ., Jeddah (Saudi Arabia)
Lytic polysaccharide monooxygenases (LPMOs) are redox-enzymes involved in biomass degradation. All characterized LPMOs possess an active site of two highly conserved histidine residues coordinating a copper ion (the histidine brace), which are essential for LPMO activity. However, some protein sequences that belong to the AA9 LPMO family display a natural N-terminal His to Arg substitution (Arg-AA9). These are found almost entirely in the phylogenetic fungal class Agaricomycetes, associated with wood decay, but no function has been demonstrated for any Arg-AA9. Through bioinformatics, transcriptomic, and proteomic analyses we present data, which suggest that Arg-AA9 proteins could have a hitherto unidentified role in fungal degradation of lignocellulosic biomass in conjunction with other secreted fungal enzymes. We present the first structure of an Arg-AA9, LsAA9B, a naturally occurring protein from Lentinus similis The LsAA9B structure reveals gross changes in the region equivalent to the canonical LPMO copper-binding site, whereas features implicated in carbohydrate binding in AA9 LPMOs have been maintained. We obtained a structure of LsAA9B with xylotetraose bound on the surface of the protein although with a considerably different binding mode compared with other AA9 complex structures. In addition, we have found indications of protein phosphorylation near the N-terminal Arg and the carbohydrate-binding site, for which the potential function is currently unknown. Finally, our results are strong evidence that Arg-AA9s function markedly different from canonical AA9 LPMO, but nonetheless, may play a role in fungal conversion of lignocellulosic biomass.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Biotechnology and Biotechnology Sciences (BBSRC); Carlsberg Foundation; Danish Council for Strategic Research; Danish Ministry of Higher Education and Science; Novo Nordisk Foundation; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1619137
- Journal Information:
- Journal of Biological Chemistry, Journal Name: Journal of Biological Chemistry Journal Issue: 45 Vol. 294; ISSN 0021-9258
- Publisher:
- American Society for Biochemistry and Molecular BiologyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Profile Comparer Extended: phylogeny of lytic polysaccharide monooxygenase families using profile hidden Markov model alignments
|
journal | January 2019 |
| Additional file 2 of Functional characterization of fungal lytic polysaccharide monooxygenases for cellulose surface oxidation | dataset | January 2023 |
Further structural studies of the lytic polysaccharide monooxygenase AoAA13 belonging to the starch-active AA13 family
|
journal | January 2019 |
Further structural studies of the lytic polysaccharide monooxygenase AoAA13 belonging to the starch-active AA13 family
|
text | January 2019 |
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