An actinobacteria lytic polysaccharide monooxygenase acts on both cellulose and xylan to boost biomass saccharification

Autor(es)

Ribeiro Correa, Thamy Livia ^[1] ; Tomazini Junior, Atilio ^[1] ; Wolf, Lucia Daniela ^[1] ; Buckeridge, Marcos Silveira ^[2] ; dos Santos, Leandro Vieira ^[1] ; Murakami, Mario Tyago ^[1]

Afiliação do(s) autor(es)

^[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Bioethanol Sci & Technol Lab CTBE, Campinas, SP - Brazil

^[2] Univ Sao Paulo, Inst Biosci, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIOTECHNOLOGY FOR BIOFUELS; v. 12, MAY 10 2019.
• Citações Web of Science: 1

Resumo

BackgroundLytic polysaccharide monooxygenases (LPMOs) opened a new horizon for biomass deconstruction. They use a redox mechanism not yet fully understood and the range of substrates initially envisaged to be the crystalline polysaccharides is steadily expanding to non-crystalline ones.ResultsThe enzyme KpLPMO10A from the actinomycete Kitasatospora papulosa was cloned and overexpressed in Escherichia coli cells in the functional form with native N-terminal. The enzyme can release oxidized species from chitin (C1-type oxidation) and cellulose (C1/C4-type oxidation) similarly to other AA10 members from clade II (subclade A). Interestingly, KpLPMO10A also cleaves isolated xylan (not complexed with cellulose, C4-type oxidation), a rare activity among LPMOs not described yet for the AA10 family. The synergistic effect of KpLPMO10A with Celluclast((R)) and an endo--1,4-xylanase also supports this finding. The crystallographic elucidation of KpLPMO10A at 1.6 angstrom resolution along with extensive structural analyses did not indicate any evident difference with other characterized AA10 LPMOs at the catalytic interface, tempting us to suggest that these enzymes might also be active on xylan or that the ability to attack both crystalline and non-crystalline substrates involves yet obscure mechanisms of substrate recognition and binding.ConclusionsThis work expands the spectrum of substrates recognized by AA10 family, opening a new perspective for the understanding of the synergistic effect of these enzymes with canonical glycoside hydrolases to deconstruct ligno(hemi)cellulosic biomass. (AU)

• Processo FAPESP: 15/26982-0 - Explorando novas estratégias para a despolimerização de polissacarídeos da parede celular vegetal: da estrutura, função e desenho racional de hidrolases glicosídicas às implicações biológicas e potenciais aplicações biotecnológicas
• Beneficiário: Mário Tyago Murakami
• Modalidade de apoio: Auxílio à Pesquisa - Temático