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Methylocystis sp. SB2

ABSTRACT: Genomic and Transcriptomic Analyses of the Facultative Methanotroph, Methylocystis Strain SB2

PROVIDER: PRJNA222791 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1012282_1.fastq.gz	Fastqsanger.gz
	SRR1012282_2.fastq.gz	Fastqsanger.gz
	SRR1012283_1.fastq.gz	Fastqsanger.gz
	SRR1012283_2.fastq.gz	Fastqsanger.gz
	SRR1012284_1.fastq.gz	Fastqsanger.gz

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Genomic and Transcriptomic Analyses of the Facultative Methanotroph, Methylocystis Strain SB2

Project description:Here we present the assembled genome of the facultative methanotroph, Methylocystis strain SB2, along with assessment of its transcriptome when grown on methane vs. ethanol. As expected, transcriptomic analyses indicate methane is converted to carbon dioxide via the canonical methane oxidation pathway for energy generation, and that carbon is assimilated at the level of formaldehyde via the serine cycle. When grown on ethanol, it appears this strain converts ethanol to acetyl-CoA and then utilizes the TCA cycle for energy generation and the ethylmalonyl CoA pathway for the production of biomass. All cultures were grown in triplicates for subsequent DNA and RNA extraction as well as for subsequent sequencing using Illumina. Transcriptomic analysis results presented in this Series.

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Project description:Using recent developments in sample preparation strategies and improvements in mass spectrometry (MS), an optimized procedure was developed to characterize the proteome of Methylocystis sp. strain SC2, a type II methanotroph. It represents one of the ecologically important groups of methane-oxidizing bacteria. The major challenge for developing an efficient analytical proteomics workflow for methanotrophic bacteria is the high amount of membrane-associated proteins that need to be efficiently solubilized and digested for downstream analysis. Therefore, each step of the workflow, including cell lysis, protein solubilization and digestion, and MS peptide quantification, was assessed and optimized. Our novel crude-lysate-MS approach proved to increase protein quantification accuracy and the proteome coverage of strain SC2. It captured 62% of predicted SC2 proteome, with 10-fold increase in membrane-associated proteins relative to less effective conditions. Use of crude cell lysate for downstream analysis showed not only to be highly efficient for strain SC2 but also for other members of the Methylocystaceae family. To validate the efficiency of our newly developed workflow, we analyzed the SC2 proteome under two contrasting nitrogen conditions, with a focus on the differential expression of proteins involved in methane and nitrogen metabolisms.

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Methylocella silvestris BL2

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Genomic and transcriptomic analyses of the facultative methanotroph Methylocystis sp. strain SB2 grown on methane or ethanol.

Project description:A minority of methanotrophs are able to utilize multicarbon compounds as growth substrates in addition to methane. The pathways utilized by these microorganisms for assimilation of multicarbon compounds, however, have not been explicitly examined. Here, we report the draft genome of the facultative methanotroph Methylocystis sp. strain SB2 and perform a detailed transcriptomic analysis of cultures grown with either methane or ethanol. Evidence for use of the canonical methane oxidation pathway and the serine cycle for carbon assimilation from methane was obtained, as well as for operation of the complete tricarboxylic acid (TCA) cycle and the ethylmalonyl-coenzyme A (EMC) pathway. Experiments with Methylocystis sp. strain SB2 grown on methane revealed that genes responsible for the first step of methane oxidation, the conversion of methane to methanol, were expressed at a significantly higher level than those for downstream oxidative transformations, suggesting that this step may be rate limiting for growth of this strain with methane. Further, transcriptomic analyses of Methylocystis sp. strain SB2 grown with ethanol compared to methane revealed that on ethanol (i) expression of the pathway of methane oxidation and the serine cycle was significantly reduced, (ii) expression of the TCA cycle dramatically increased, and (iii) expression of the EMC pathway was similar. Based on these data, it appears that Methylocystis sp. strain SB2 converts ethanol to acetyl-coenzyme A, which is then funneled into the TCA cycle for energy generation or incorporated into biomass via the EMC pathway. This suggests that some methanotrophs have greater metabolic flexibility than previously thought and that operation of multiple pathways in these microorganisms is highly controlled and integrated.

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