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Transcriptome Analysis of Avicel Utilization by Thermomyces lanuginosus

ABSTRACT: Thermomyces lanuginosus is a thermophilic fungus whose genome encodes many carbohydrate-active enzymes involved in Avicel degradation. This study examined and compared the transcriptomes of T. lanuginosus during cultivation on Avicesl or glucose. We identified approximately 4485 genes that showed expression differences when T. lanuginosus was cultured on Avicel compared to glucose. Functional annotation of up-regulated genes showed enrichment for proteins predicted to be involved in Avicel degradation, but also many genes encoding proteins of unknown function. Our study represents the first analysis of transcriptomes, with biologic replicates, generated by RNA-seq technology. We conclude that RNA-seq based transcriptome characterization would expedite genetic network analyses and permit the dissection of complex biologic functions.

ORGANISM(S): Thermomyces lanuginosus

PROVIDER: GSE69763 | GEO | 2015/06/17

SECONDARY ACCESSION(S): PRJNA286684

REPOSITORIES: GEO

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Project description:Plant biomass holds tremendous potential as a renewable feedstock in the production of biofuels and biochemicals. The effective co-utilization of the main components cellulose and hemicellulose in plant lignocellulose is critical to the economic viability of lignocellulosic biorefineries. Here, we found that the thermophilic cellulolytic fungi Myceliophthora thermophila can utilize cellulose and hemicellulose synchronously. To investigate the underlying molecular mechanisms, we firstly checked the soluble carbohydrate of the culture using plant biomass (corncob) as sole carbon source and revealed the presence of various oligosaccharides including cellodextrin and xylodextrin, both intracellularly and extracellularly in the cultures, in addition to glucose or xylose. Based on these, intracellular oligosaccharide metabolism was proposed and confirmed by identification of cellodextrin and xylodextrin metabolism pathway. Furthermore, sugar consumption assay showed that contrasting with synchronous utilization of mixed cello-/xylo-dextrin, the inhibition effect of glucose for the metabolism of xylose and cello-/xylo-dextrin exists in this fungus, suggesting Carbon Catabolite Repression (CCR) is largely avoided at the form of oligosaccharides. Transporter MtCDT-2 showing preference to xylobiose and the tolerance of cellobiose inhibition also helps to bypass metabolic inhibition. Finally, the expression of cellulase and hemicellulase genes, were found orthogonal induction by cellobiose/Avicel and xylobiose/xylan, which conferred the ability of the strain to synchronously utilize cellulose and hemicellulose. Taken together, the orthogonal oligosaccharide catabolic pathway in this fungus establishes the molecular basis for the synchronous utilization of cellulose and hemicellulose, which sheds new light on understanding the plant biomass degradation by fungi and provides alternative paradigm for development of lignocellulose biorefinery such as consolidated bioprocessing in the future.

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Transcriptome Analysis of Avicel Utilization by Thermomyces lanuginosus

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