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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 and Low-Resolution Structure of an Endoglucanase Cel45A from the Filamentous Fungus Neurospora crassa OR74A: Thermostable Enzyme with High Activity Toward Lichenan and beta-Glucan

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Seiki Kadowaki, Marco Antonio [1] ; Camilo, Cesar Moises [1] ; Muniz, Amanda Bernardes [1] ; Polikarpov, Igor [1]
Total Authors: 4
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: MOLECULAR BIOTECHNOLOGY; v. 57, n. 6, p. 574-588, JUN 2015.
Web of Science Citations: 7

Biomass is the most abundant and short-term renewable natural resource on Earth whose recalcitrance toward enzymatic degradation represents significant challenge for a number of biotechnological applications. The not so abundant but critically necessary class of GH45 endoglucanases constitutes an essential component of tailored industrial enzyme cocktails because they randomly and internally cleave cellulose molecules. Moreover, GH45 glucanases are core constituents of major-brand detergent formulations as well as enzymatic aid components in the cotton processing industry, clipping unwanted cellulosic fibers from cotton (cellulosic)-based tissues. Here we report on a recombinant high-yield Neurospora crassa OR74A NcCel45A production system, a single-band GH45 endoglucanase purification, and a complete enzyme functional characterization. NcCel45A is a bimodular endoglucanase showing maximum activity at pH 6.0 and 60 A degrees C, while most active against lichenan and beta-glucans and lesser active toward filter paper, carboxymethylcellulose, and phosphoric acid-swollen cellulose. Gluco-oligosaccharide degradation fingerprinting experiments suggest cellopentaose as the minimal length substrate and ThermalFluor studies indicate that NcCel45A displays excellent stability at elevated temperatures up to 70 A degrees C and pHs ranging from 5 to 9. Remarkably, we show that NcCel45A is uniquely resistant to a wide-range of organic solvents and small-angle X-ray scattering show a monkey-wrench molecular shape structure in solution, which indicates, unlike to other known cellulases, a non-fully extended conformation, thus conferring solvent protection. These NcCel45A unique enzymatic properties maybe key for specific industrial applications such as cotton fiber processing and detergent formulations. (AU)

FAPESP's process: 10/08680-2 - Molecular aspectos of lignocellulosic biomass degradation: dynamics of enzymes and plant cell wall nanoarchitecture
Grantee:Rodrigo Leandro Silveira
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 09/11536-3 - Biochemical and structural studies of the cellulolytic system of Trichoderma reesei and Phanerochaete chrysosporium, applied to improve the efficiency biomass degradation
Grantee:Cesar Moises Camilo
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 09/54035-4 - Facility for advanced studies of biosystems and nanostructured materials
Grantee:Igor Polikarpov
Support type: Multi-user Equipment Program
FAPESP's process: 11/20505-4 - Two important classes of glycosyl hydrolases: functional studies and structural analysis
Grantee:Marco Antonio Seiki Kadowaki
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 08/56255-9 - Structure and function of enzymes and auxiliary proteins from Trichoderma, active in cell-wall hydrolysis
Grantee:Igor Polikarpov
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants