GH43 endo-arabinanase from Bacillus licheniformis: Structure, activity and unexpected synergistic effect on cellulose enzymatic hydrolysis

Autor(es)

Farro, Erick Giancarlo S. ^[1] ; Leite, Ana Elisa T. ^[1] ; Silva, Isabela A. ^[1] ; Filgueiras, Jefferson G. ^[1] ; de Azevedo, Eduardo R. ^[1] ; Polikarpov, Igor ^[1] ; Nascimento, Alessandro S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Biological Macromolecules; v. 117, p. 7-16, OCT 1 2018.
• Citações Web of Science: 2

Resumo

The hydrolysis of the plant biomass provides many interesting opportunities for the generation of building blocks for the green chemistry industrial applications. An important progress has been made for the hydrolysis of the cellulosic component of the biomass while, for the hemicellulosic components, the advances are less straightforward. Here, we describe the cloning, expression and biochemical and structural characterization of BlAbnl, a GH43 arabinanase from Bacillus licheniformis. This enzyme is selective for linear arabinan and efficiently hydrolyzes this substrate, with a specific activity of 127 U/mg. The enzyme has optimal conditions for activity at pH 8.0 and 45 degrees C and its activity is only partially dependent of a bound calcium ion since 70% of the maximal activity is preserved even when 1 mM EDTA is added to the reaction medium. BlAbn1 crystal structure revealed a typical GH43 fold and narrow active site, which explains the selectivity for linear substrates. Unexpectedly, the enzyme showed a synergic effect with the commercial cocktail Accellerase 1500 on cellulose hydrolysis. Scanning Electron Microscopy, Solid-State NMR and relaxometry data indicate that the enzyme weakens the interaction between cellulose fibers in filter paper, thus providing an increased access to the cellulases of the cocktail. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/06565-2 - Estendendo as fronteiras em interações biomoleculares: docking e avaliação da energia livre
• Beneficiário: Alessandro Silva Nascimento
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/13684-0 - Estudos estruturais e funcionais de enzimas que participam na síntese e degradação de carboidratos complexos
• Beneficiário: Igor Polikarpov
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/03768-0 - Busca de moldes estruturais para a engenharia de funções catalíticas
• Beneficiário: Erick Giancarlo Suclupe Farro
• Modalidade de apoio: Bolsas no Brasil - Mestrado