Dataset Information

Screening of fiber-degrading bacteria and metabolic utilization rice straw

ABSTRACT: To increase the utilization rate of straw, the purpose of this study screened cellulose-degrading bacteria from the intestinal tract of termites by Congo red primary screening and filter paper degradation re-screening test, which was Cellulomonas iranensis (CE). The enzyme activities of endoglucanase, exoglucose and β glucosidase of them were measured at 0.097 U/mL, 0.316 U/mL, 0.110 U/mL. PS was also inoculated in the liquid medium with rice straw or glucose as the sole carbon source for14 days fermentation. Further transcriptomic and proteomic analyses revealed that rice straw cultured CE an upregulation of genes and a downregulation of genes, compared with glucose cultured PS.

ORGANISM(S): Cellulomonas Iranensis

SUBMITTER: Qing Zhang

PROVIDER: PXD065194 | iProX | Wed Jun 18 00:00:00 BST 2025

REPOSITORIES: iProX

ACCESS DATA

Similar Datasets

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.

Dataset Information

Screening of fiber-degrading bacteria and metabolic utilization rice straw

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets