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Functional and structural study of a cellulosomal cellulase from anaerobic fungus and its dockerin-scaffoldin interaction

Grant number: 20/15595-3
Support Opportunities:Regular Research Grants
Duration: September 01, 2021 - February 29, 2024
Field of knowledge:Biological Sciences - Biophysics - Molecular Biophysics
Principal Investigator:Wanius José Garcia da Silva
Grantee:Wanius José Garcia da Silva
Host Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil
Associated researchers:Fábio Márcio Squina ; Leandro Farias Estrozi


The lignocellulosic biomass is the most abundant renewable carbon source on the planet, with several biotechnological applications, including the conversion of cellulose into ethanol. The cellulosome is a modular multi-enzymatic complex with high molecular mass present in anaerobic microorganisms and which presents a high efficiency in the degradation of cellulose. As a comparison, the cellulosome of the anaerobic bacterium Clostridium thermocellum presents one of the highest degradation rates with efficiency dozens of times higher in the degradation of crystalline cellulose when compared to the cellulolytic system of the fungus of the genus Trichoderma. Similarly to the bacterium C. thermocellum, the enzymes of anaerobic fungi that degrade the plant cell wall are organized into cellulosomes with high molecular mass. In contrast to bacterial cellulosomes, fungal cellulosomes are still much less studied and characterized. Even after all the research developed, currently an effective commercial process using cellulosomes is still not feasible. Therefore, more studies need to be carried out to better understand the mechanism of assembly and action of cellulosomes, especially the cellulosomes of anaerobic fungi. To this end, in this research project, we propose to study a cellulosomal cellulase identified in the genome of the anaerobic fungus Piromyces finnis and its interaction with scaffoldins of the same fungus. The sequence of a cellulase from the GH5 family from P. finnis e two scaffoldins were cloned into bacterial expression vectors. P. finnis cellulase is composed of a GH5 catalytic domain connected to a CBM1 domain through a dockerin module, and showed promising expression in E. coli cells. Efforts will be directed at the initiative to build mini-cellulosomes of P. finnis, based on the recombinant expression of two different scaffoldins and evaluation of their interaction with the modular cellulase (dockerin-scaffoldin interaction). The structure of the modular cellulase and the formation of complexes with scaffoldins will be analyzed by physical techniques such as circular dichroism spectroscopy, dynamic light scattering, small angle X-rays scattering, protein crystallography and cryogenic electron microscopy. The results from this research can provide original and innovative information on the structure, organization and functioning of cellulosome complexes of anaerobic fungi. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DOS SANTOS, OTAVIO AUGUSTO LEITAO; GONCALVES, THIAGO AUGUSTO; SODRE, VICTORIA; VILELA, NATHALIA; TOMAZETTO, GEIZECLER; SQUINA, FABIO M.; GARCIA, WANIUS. Recombinant expression, purification and characterization of an active bacterial feruloyl-CoA synthase with potential for application in vanillin production. Protein Expression and Purification, v. 197, p. 7-pg., . (17/16089-1, 15/50590-4, 18/18101-1, 17/08166-6, 20/15595-3, 20/05784-3, 17/17275-3)
ANDRADE, VIVIANE BRITO; TOMAZETTO, GEIZECLER; ALMEIDA, DNANE VIEIRA; TRAMONTINA, ROBSON; SQUINA, FABIO MARCIO; GARCIA, WANIUS. Enzymatic and biophysical characterization of a novel modular cellulosomal GH5 endoglucanase multifunctional from the anaerobic gut fungus Piromyces finnis. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS, v. 1872, n. 1, p. 11-pg., . (20/15595-3, 20/05784-3, 21/04254-3, 15/23279-6, 22/08958-8, 15/50590-4)

Unique properties of a Dictyostelium discoideum carbohydrate-binding module expand our understanding of CBM-ligand interactions

. Journal of Biological Chemistry, v. 298, n. 5, p. 10-pg., . (15/50590-4, 13/06336-0, 15/23279-6, 20/15595-3, 14/04105-4, 20/05784-3, 15/14009-5, 17/17275-3)

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