Morphology and enzyme production of Trichoderma reesei Rut C-30 are affected by the physical and structural characteristics of cellulosic substrates
Journal article, 2014

The industrial production of cellulolytic enzymes is dominated by the filamentous fungus Trichoderma reesei (anamorph of Hypocrea jecorina). In order to develop optimal enzymatic cocktail, it is of importance to understand the natural regulation of the enzyme profile as response to the growth substrate. The influence of the complexity of cellulose on enzyme production by the microorganisms is not understood. In the present study we attempted to understand how different physical and structural properties of cellulose-rich substrates affected the levels and profiles of extracellular enzymes produced by T. reesei. Enzyme production by T. reesei Rut C-30 was studied in submerged cultures on five different cellulose-rich substrates, namely, commercial cellulose AvicelĀ® and industrial-like cellulosic pulp substrates which consist mainly of cellulose, but also contain residual hemicellulose and lignin. In order to evaluate the hydrolysis of the substrates by the fungal enzymes, the spatial polymer distributions were characterised by cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance (CP/MAS 13C-NMR) in combination with spectral fitting. Proteins in culture supernatants at early and late stages of enzyme production were labeled by Tandem Mass Tags (TMT) and protein profiles were analysed by liquid chromatography-tandem mass spectrometry. In total 124 proteins were identified and quantified in the culture supernatants, including cellulases, hemicellulases, other glycoside hydrolases, lignin-degrading enzymes, auxiliary activity 9 (AA9) family (formerly GH61), supporting activities of proteins and enzymes acting on cellulose, proteases, intracellular proteins and several hypothetical proteins. Surprisingly, substantial differences in the enzyme profiles were found even though there were minor differences in the chemical composition between the cellulose-rich substrates.

TMT

biomass degrading enzymes

Trichoderma reesei Rut C-30

Cellulose I structure

submerged cultivation

quantitative proteomics

Author

Ausra Peciulyte

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

George E Anasontzis

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

Katarina Karlström

Innventia

Per Tomas Larsson

Innventia

Royal Institute of Technology (KTH)

Lisbeth Olsson

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

Fungal Genetics and Biology

1087-1845 (ISSN) 1096-0937 (eISSN)

Vol. 72 64-72

Subject Categories

Paper, Pulp and Fiber Technology

Biocatalysis and Enzyme Technology

Areas of Advance

Life Science Engineering

DOI

10.1016/j.fgb.2014.07.011

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9/6/2018 1