Enzyme production by filamentous fungi: analysis of the secretome of Trichoderma reesei grown on unconventional carbon source

Microbial Cell Factories

Research

Thomas Kieselbach¹  Leif J Jönsson¹  He Jun² 

[1] Department of Chemistry, Umeå University, Umeå, Sweden;Department of Chemistry, Umeå University, Umeå, Sweden;Research Institute of Animal Nutrition, Sichuan Agricultural University Ya'an, 625014, Sichuan, P. R. China;

关键词: Xylose;    Cellulase;    Protein Spot;    Corn Stover;    Sugarcane Bagasse;   

DOI  :  10.1186/1475-2859-10-68

 received in 2011-06-09, accepted in 2011-08-23,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundSpent hydrolysates from bioethanolic fermentation processes based on agricultural residues have potential as an abundant and inexpensive source of pentose sugars and acids that could serve as nutrients for industrial enzyme-producing microorganisms, especially filamentous fungi. However, the enzyme mixtures produced in such media are poorly defined. In this study, the secretome of Trichoderma reesei Rut C-30 grown either on a spent hydrolysate model medium (SHMM) or on a lactose-based standard medium (LBSM) was explored using proteomics.ResultsOur results show that both the SHMM and LBSM serve as excellent growth media for T. reesei Rut C-30. In total, 52 protein spots on 2-D gels were identified by using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) and electrospray ionization liquid chromatography tandem mass spectrometry (ESI-LC MS/MS). As expected, a considerable number of the identified proteins were related to the degradation of lignocellulosic biomass. The enzyme production profiles in the two media were similar, but β-glucosidase and β-galactosidase were only produced in LBSM. The main cellobiohydrolases (Cel7A/Cel6A) and endoglucanases (Cel7B/Cel5A) were identified in both media and the cellobiohydrolases, i.e. Cel7A and Cel6A, were the most abundant cellulolytic enzymes. Moreover, both media can also serve as a potent inducer of xylanolytic enzymes. Several key enzymes involved in sugar assimilation and regulation of cellulase formation were identified, and were found to be differentially expressed in the two growth media.ConclusionsThis study not only provides a catalogue of the prevalent proteins secreted by T. reesei in the two media, but the results also suggest that production of hydrolytic enzymes using unconventional carbon sources, such as components in spent hydrolysates, deserves further attention in the future.

【 授权许可】

Unknown   
© Jun et al; licensee BioMed Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.