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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Functional characterization of GH7 endo-1,4-beta-glucanase from Aspergillus fumigatus and its potential industrial application

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Author(s):
Bernardi, Aline Vianna [1] ; de Gouvea, Paula Fagundes [1] ; Gerolamo, Luis Eduardo [1] ; Yonamine, Deborah Kimie [1] ; de Lima Balico, Lais de Lourdes [2] ; Uyemura, Sergio Akira [2] ; Dinamarco, Taisa Magnani [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Ribeirao Preto, SP - Brazil
[2] Fac Ciencias Farmaceut Ribeirao Preto, Ribeirao Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Protein Expression and Purification; v. 150, p. 1-11, OCT 2018.
Web of Science Citations: 7
Abstract

A gene encoding an endo-1,4-beta-glucanase (Afu6g01800) from A. fumigatus was cloned into the vector pET-28a (+) and expressed in the E. coli strain RosettaTM (DE3) pLysS. Sequence analysis indicated that the enzyme Af-EGL7 belonged to the GH7 family. The gene Af-egl7 encoded a protein comprising 460 amino acids, with a CBM1 domain at residues 424-460 and molecular mass of 52 kDa, as estimated by SDS-PAGE. This enzyme was optimally active at pH and temperatures ranging from 4.5 to 5.5 and from 40 to 60 degrees C, respectively. Mn2+ addition significantly enhanced the Af-EGL7 cellulase activity by 233%, whereas SDS addition fully inhibited this activity. Higher activity was observed toward beta-glucan than toward xyloglucan and CM-Cellulose, suggesting that the enzyme corresponds to a beta-1,3-1,4-glucanase. qRT-PCR in different culture media helped to establish the time course expression profile. Different polysaccharides induced the gene Af-egl7 in a time-dependent manner; in the particular case of the substrate sugarcane exploded bagasse (SEB), Af-egl7 was induced 2500-fold. Upon addition to a commercial cellulase cocktail, Af-EGL7 significantly improved SEB saccharification, which suggested that the enzyme Af-EGL7 had great potential to hydrolyze complex biomass. From a biotechnological point of view, A. fumigatus Af-EGL7 is a promising candidate to enhance enzyme cocktails used in biorefineries such as consolidated bioprocessing. (AU)

FAPESP's process: 14/10466-0 - Transcriptome analysis of Aspergillus fumigatus grown on sugarcane bagasse
Grantee:Taisa Magnani Dinamarco
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 16/19095-0 - Identification, characterization and functional expression of auxiliary activity enzymes (LPMOs) from Aspergillus fumigatus
Grantee:Taisa Magnani Dinamarco
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants