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Acaryochloris marina MBIC11017

ABSTRACT: The complex transcriptional response of Acaryochloris marina to different oxygen levels

PROVIDER: PRJNA352044 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR4784080_1.fastq.gz	Fastqsanger.gz
	SRR4784080_2.fastq.gz	Fastqsanger.gz
	SRR4784081_1.fastq.gz	Fastqsanger.gz
	SRR4784081_2.fastq.gz	Fastqsanger.gz
	SRR4784082_1.fastq.gz	Fastqsanger.gz

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The complex transcriptional response of Acaryochloris marina to different oxygen levels

Project description:Ancient oxygenic photosynthetic prokaryotes produced oxygen as a waste product, but existed for a long time under an oxygen-free (anoxic) atmosphere, before an oxic atmosphere emerged. The change in oxygen levels in the atmosphere influenced the chemistry and structure of many enzymes that contained prosthetic groups that were inactivated by oxygen. In the genome of Acaryochloris marina, multiple gene copies exist for proteins that are normally encoded by a single gene copy in other cyanobacteria. Using high throughput RNA sequencing to profile transcriptome responses from cells grown under microoxic and hyperoxic conditions, we detected 8446 transcripts out of the 8462 annotated genes in the Cyanobase database. Two thirds of the 50 most abundant transcripts are key proteins in photosynthesis. Microoxic conditions negatively affected the levels of expression of genes encoding photosynthetic complexes, with the exception of some subunits. In addition to the known regulation of the multiple copies of psbA, we detected a similar transcriptional pattern for psbJ and psbU, which might play a key role in the altered components of photosystem II. Furthermore, regulation of genes encoding proteins important for reactive oxygen species-scavenging is discussed at genome level, including, for the first time, specific small RNAs having possible regulatory roles under varying oxygen levels.

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Project description:The aim of this project is to identify, by bottom-up proteomic analysis, one or both representatives of two classes of 8-vinyl reductase in an Acaryochloris marina cell lysate. This enzyme is responsible for the conversion of the C8 vinyl group in the chlorophyll precursor Mg-divinyl-protochlorophyllide to ethyl as part of the chlorphyll biosynthesis pathway. Both putative 8VRs, NmrA and FrhB were detected.

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Project description:In this study, we investigated the metabolic potential of N. marina based on its complete genome sequence and performed physiological experiments to test genome-derived hypotheses. Our data confirm that N. marina benefits from additions of undefined organic carbon substrates, has adaptations to resist oxidative, osmotic and UV light-induced stress and low dissolved pCO2. Additionally, N. marina is able to grow chemoorganotrophically on formate, and is thus not an obligate chemolithoautotroph. We further investigated the metabolic response of N. marina to low (5.6 µM) O2 concentrations. In response to O2-limited conditions, the abundance of a potentially more efficient CO2-fixing pyruvate:ferredoxin oxidoreductase (POR) complex and a high-affinity cbb3-type terminal oxidase increased, suggesting a role in sustaining nitrite oxidation-driven autotrophy under O2 limitation.

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