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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.)

Carbohydrate-active enzymes in Trichoderma harzianum: a bioinformatic analysis bioprospecting for key enzymes for the biofuels industry

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Ferreira Filho, Jaire Alves [1, 2] ; Crivelente Horta, Maria Augusta [1] ; Beloti, Lilian Luzia [1] ; dos Santos, Clelton Aparecido [1] ; de Souza, Anete Pereira [1, 3]
Total Authors: 5
[1] Univ Campinas UNICAMP, Ctr Mol Biol & Genet Engn CBMEG, Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Biol, Grad Program Genet & Mol Biol, Campinas, SP - Brazil
[3] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: BMC Genomics; v. 18, OCT 12 2017.
Web of Science Citations: 4

Background: Trichoderma harzianum is used in biotechnology applications due to its ability to produce powerful enzymes for the conversion of lignocellulosic substrates into soluble sugars. Active enzymes involved in carbohydrate metabolism are defined as carbohydrate-active enzymes (CAZymes), and the most abundant family in the CAZy database is the glycoside hydrolases. The enzymes of this family play a fundamental role in the decomposition of plant biomass. Results: In this study, the CAZymes of T. harzianum were identified and classified using bioinformatic approaches after which the expression profiles of all annotated CAZymes were assessed via RNA-Seq, and a phylogenetic analysis was performed. A total of 430 CAZymes (3.7% of the total proteins for this organism) were annotated in T. harzianum, including 259 glycoside hydrolases (GHs), 101 glycosyl transferases (GTs), 6 polysaccharide lyases (PLs), 22 carbohydrate esterases (CEs), 42 auxiliary activities (AAs) and 46 carbohydrate-binding modules (CBMs). Among the identified T. harzianum CAZymes, 47% were predicted to harbor a signal peptide sequence and were therefore classified as secreted proteins. The GH families were the CAZyme class with the greatest number of expressed genes, including GH18 (23 genes), GH3 (17 genes), GH16 (16 genes), GH2 (13 genes) and GH5 (12 genes). A phylogenetic analysis of the proteins in the AA9/GH61, CE5 and GH55 families showed high functional variation among the proteins. Conclusions: Identifying the main proteins used by T. harzianum for biomass degradation can ensure new advances in the biofuel production field. Herein, we annotated and characterized the expression levels of all of the CAZymes from T. harzianum, which may contribute to future studies focusing on the functional and structural characterization of the identified proteins. (AU)

FAPESP's process: 16/19775-0 - Development and/or improvement of enzymatic cocktails designed for plant biomass hydrolysis: use of site-directed mutagenesis and chimeric proteins design
Grantee:Clelton Aparecido dos Santos
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/09202-0 - Study of Trichoderma harzianum genomic regions associated to the control of the expression of the enzymes involved in the degradation of biomass
Grantee:Anete Pereira de Souza
Support type: Regular Research Grants
FAPESP's process: 14/18856-1 - Study of global gene expression and genomic regions associated with control expression of enzymes involved in the degradation of lignocellulosic compounds by Trichoderma harzianum
Grantee:Maria Augusta Crivelente Horta
Support type: Scholarships in Brazil - Post-Doctorate