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Cellulomonas fimi ATCC 484

ABSTRACT: Cellulose-degrading bacterium

PROVIDER: PRJNA33691 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR191895.fastq.gz	Fastqsanger.gz
	SRR3926443.fastq.gz	Fastqsanger.gz
	SRR3926444.fastq.gz	Fastqsanger.gz
	GCA_000212695.1_sequence_report.txt	Txt

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Project description:Cellulose-degrading bacterium

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Proteomic Analysis of the Secretome of Cellulomonas fimi ATCC 484 and Cellulomonas flavigena ATCC 482.

Project description:The bacteria in the genus Cellulomonas are known for their ability to degrade plant cell wall biomass. Cellulomonas fimi ATCC 484 and C. flavigena ATCC 482 have been the subject of much research into secreted cellulases and hemicellulases. Recently the genome sequences of both C. fimi ATCC 484 and C. flavigena ATCC 482 were published, and a genome comparison has revealed their full spectrum of possible carbohydrate-active enzymes (CAZymes). Using mass spectrometry, we have compared the proteins secreted by C. fimi and C. flavigena during growth on the soluble cellulose substrate, carboxymethylcellulose (CMC), as well as a soluble xylan fraction. Many known C. fimi CAZymes were detected, which validated our analysis, as were a number of new CAZymes and other proteins that, though identified in the genome, have not previously been observed in the secretome of either organism. Our data also shows that many of these are co-expressed on growth of either CMC or xylan. This analysis provides a new perspective on Cellulomonas enzymes and provides many new CAZyme targets for characterization.

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Project description:Cellulose-degrading bacterium

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Characterization of five ?-glycoside hydrolases from Cellulomonas fimi ATCC 484.

Project description:The Gram-positive bacterium Cellulomonas fimi produces a large array of carbohydrate-active enzymes. Analysis of the collection of carbohydrate-active enzymes from the recent genome sequence of C. fimi ATCC 484 shows a large number of uncharacterized genes for glycoside hydrolase (GH) enzymes potentially involved in biomass utilization. To investigate the enzymatic activity of potential ?-glucosidases in C. fimi, genes encoding several GH3 enzymes and one GH1 enzyme were cloned and recombinant proteins were expressed in Escherichia coli. Biochemical analysis of these proteins revealed that the enzymes exhibited different substrate specificities for para-nitrophenol-linked substrates (pNP), disaccharides, and oligosaccharides. Celf_2726 encoded a bifunctional enzyme with ?-d-xylopyranosidase and ?-l-arabinofuranosidase activities, based on pNP-linked substrates (CfXyl3A). Celf_0140 encoded a ?-d-glucosidase with activity on ?-1,3- and ?-1,6-linked glucosyl disaccharides as well as pNP-?-Glc (CfBgl3A). Celf_0468 encoded a ?-d-glucosidase with hydrolysis of pNP-?-Glc and hydrolysis/transglycosylation activities only on ?-1,6-linked glucosyl disaccharide (CfBgl3B). Celf_3372 encoded a GH3 family member with broad aryl-?-d-glycosidase substrate specificity. Celf_2783 encoded the GH1 family member (CfBgl1), which was found to hydrolyze pNP-?-Glc/Fuc/Gal, as well as cellotetraose and cellopentaose. CfBgl1 also had good activity on ?-1,2- and ?-1,3-linked disaccharides but had only very weak activity on ?-1,4/6-linked glucose.

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