Glycosylation of hyperthermostable designer cellulosome components yields enhanced stability and cellulose hydrolysis.
Caldicellulosiruptor bescii
cellulosome
expression host
glycosylation
thermostability
Journal
The FEBS journal
ISSN: 1742-4658
Titre abrégé: FEBS J
Pays: England
ID NLM: 101229646
Informations de publication
Date de publication:
10 2020
10 2020
Historique:
received:
29
08
2019
revised:
06
01
2020
accepted:
14
02
2020
pubmed:
18
2
2020
medline:
18
5
2021
entrez:
18
2
2020
Statut:
ppublish
Résumé
Biomass deconstruction remains integral for enabling second-generation biofuel production at scale. However, several steps necessary to achieve significant solubilization of biomass, notably harsh pretreatment conditions, impose economic barriers to commercialization. By employing hyperthermostable cellulase machinery, biomass deconstruction can be made more efficient, leading to milder pretreatment conditions and ultimately lower production costs. The hyperthermophilic bacterium Caldicellulosiruptor bescii produces extremely active hyperthermostable cellulases, including the hyperactive multifunctional cellulase CbCel9A/Cel48A. Recombinant CbCel9A/Cel48A components have been previously produced in Escherichia coli and integrated into synthetic hyperthermophilic designer cellulosome complexes. Since then, glycosylation has been shown to be vital for the high activity and stability of CbCel9A/Cel48A. Here, we studied the impact of glycosylation on a hyperthermostable designer cellulosome system in which two of the cellulosomal components, the scaffoldin and the GH9 domain of CbCel9A/Cel48A, were glycosylated as a consequence of employing Ca. bescii as an expression host. Inclusion of the glycosylated components yielded an active cellulosome system that exhibited long-term stability at 75 °C. The resulting glycosylated designer cellulosomes showed significantly greater synergistic activity compared to the enzymatic components alone, as well as higher thermostability than the analogous nonglycosylated designer cellulosomes. These results indicate that glycosylation can be used as an essential engineering tool to improve the properties of designer cellulosomes. Additionally, Ca. bescii was shown to be an attractive candidate for production of glycosylated designer cellulosome components, which may further promote the viability of this bacterium both as a cellulase expression host and as a potential consolidated bioprocessing platform organism.
Substances chimiques
Cellulose
9004-34-6
Cellulases
EC 3.2.1.-
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
4370-4388Informations de copyright
© 2020 Federation of European Biochemical Societies.
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