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Candidatus Puniceispirillum marinum IMCC1322

ABSTRACT: Transcriptome analysis of light-utilizing Strain IMCC1322, a member of SAR116 group bacteria

PROVIDER: PRJNA141609 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR210879.fastq.gz	Fastqsanger.gz
	SRR210880.fastq.gz	Fastqsanger.gz
	SRR210881.fastq.gz	Fastqsanger.gz
	SRR210882.fastq.gz	Fastqsanger.gz
	SRR210883.fastq.gz	Fastqsanger.gz

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Candidatus Puniceispirillum marinum

Project description:alpha proteobacterium IMCC1322 overview

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Effect of Light Regime on <i>Candidatus</i> Puniceispirillum marinum IMCC1322 in Nutrient-Replete Conditions.

Project description:Previous studies showed no improvement in bacterial biomass for Candidatus Puniceispirillum marinum IMCC1322 under light regimes. Nevertheless, in nutrient-replete cultures with higher inoculating cell densities, strain IMCC1322 exhibited proteorhodopsin photoheterotrophy. Increasing both inoculum size and the amino acid pool can eliminate quorum sensing and starvation responses in strain IMCC1322. Light regimes affected IMCC1322 cultures in stationary/death phases, where cellular ATP levels ranged from 0.0331 to 1.74 mM, with ATP/cell ranging from 13.9 to 367 zeptomoles. In nutrient-depleted conditions, strain IMCC1322 may suffer from excessive protons generated by proteorhodopsin under light conditions. IMCC1322 may tolerate excessive periplasmic protons through ATP-dependent proton pumping and protonation of augmented amino acids. Meanwhile, acid stress could also be mitigated by refining membrane permeability through unsaturation and cyclopropanation of phospholipids. Oceanic bacteria such as IMCC1322 and SAR11 preferred anaplerotic TCA cycles over glycolysis and rely on the Entner-Doudoroff (ED) pathway for growth. Although ATP generation is less efficient in the ED pathway, it offers advantages during rapid growth owing to its strong thermodynamic driving force. The metabolism of IMCC1322 favors gluconeogenesis over glycolysis, aligning with the metabolism of SAR11 reported in previous studies. However, the additional light-driven, PR-dependent ATP synthesis in IMCC1322 is expected to be insufficient to support protein turnover after the log phase, as well as in nutrient-limited conditions. Stable isotope measurements showed no significant differences in the inorganic carbon assimilation between constant light and constant dark cultures in late log phase.

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Complete genome sequence of "Candidatus Puniceispirillum marinum" IMCC1322, a representative of the SAR116 clade in the Alphaproteobacteria.

Project description:The complete genome sequence of "Candidatus Puniceispirillum marinum" IMCC1322, the first cultured representative of the SAR116 clade in the Alphaproteobacteria, is reported here. The genome contains genes for proteorhodopsin, aerobic-type carbon monoxide dehydrogenase, dimethylsulfoniopropionate demethylase, and C(1) compound metabolism. The genome information proposes the SAR116 group to be metabolic generalists in ocean nutrient cycling.

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Candidatus Puniceispirillum marinum IMCC1322

Project description:Marine organism isolated from the East Sea of Korea

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Candidatus Puniceispirillum

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Transcriptome analysis of light-utilizing Strain IMCC1322, a member of SAR116 group bacteria

Project description:The purpose of this study is to elucidate the proteorhodopsin function based on the genome of strain IMCC1322 which was cultivated species of SAR116 from East Sea of Korea. Light-enhanced photoheterotrophy of strain IMCC1322 is interrogated by the transcriptomics of IMCC1322 once the appropriate phenotypic characteristics are revealed by cultivation and polyphasic studies. Transcriptome revealed that green light (max. wavelength =522nm) drives metabolism and cessation of bacterial aging of IMCC1322. Here we report the mRNA profiling of IMCC1322 which is the first effort to the biogeochemistry of light-utilizing SAR116 group in the ocean.

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