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Roseibium alexandrii DFL-11

ABSTRACT: Collected from the toxic dinoflagellate Alexandrium ostenfeldii

PROVIDER: PRJNA19367 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ACCU02.dat.gz	Other
	ACCU02.fasta.gz	Fasta.gz
	ACCU02.master.dat	Other
	ACCU01.dat.gz	Other

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Roseibium alexandrii

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Genome of the R-body producing marine alphaproteobacterium Labrenzia alexandrii type strain (DFL-11(T)).

Project description:Labrenzia alexandrii Biebl et al. 2007 is a marine member of the family Rhodobacteraceae in the order Rhodobacterales, which has thus far only partially been characterized at the genome level. The bacterium is of interest because it lives in close association with the toxic dinoflagellate Alexandrium lusitanicum. Ultrastructural analysis reveals R-bodies within the bacterial cells, which are primarily known from obligate endosymbionts that trigger "killing traits" in ciliates (Paramecium spp.). Genomic traits of L. alexandrii DFL-11(T) are in accordance with these findings, as they include the reb genes putatively involved in R-body synthesis. Analysis of the two extrachromosomal elements suggests a role in heavy-metal resistance and exopolysaccharide formation, respectively. The 5,461,856 bp long genome with its 5,071 protein-coding and 73 RNA genes consists of one chromosome and two plasmids, and has been sequenced in the context of the Marine Microbial Initiative.

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Project description:transcriptomic response to various nitrate concentrations in the toxic dinoflagellate Alexandrium tamarense

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Amphidinium operculatum

Project description:Toxic marine dinoflagellate

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Roseibium alexandrii strain:MAR44

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MS Differentiating toxic and nontoxic congeneric harmful algae using the non-polar metabolome

Project description:Recognition and rejection of chemically defended prey is critical to maximizing fitness for predators. Paralytic shellfish toxins (PSTs) which strongly inhibit voltage-gated sodium channels in diverse animal taxa are produced by several species of the bloom-forming algal genus Alexandrium where they appear to function as chemical defenses against grazing copepods. Despite PSTs being produced and localized within phytoplankton cells, some copepods distinguish toxic from non-toxic prey, selectively ingesting less toxic cells, in ways that suggest cell surface recognition perhaps associated with non-polar metabolites. In this study LC/MS and NMR-based metabolomics revealed that the non-polar metabolomes of two toxic species (Alexandrium catenella and Alexandrium pacificum) vary considerably from their non-toxic congener Alexandrium tamarense despite all three being very closely related. Toxic and non-toxic Alexandrium spp. were distinguished from each other by metabolites belonging to seven lipid classes. Of these, 17 specific metabolites were significantly more abundant in both toxic A. catenella and A. pacificum compared to non-toxic A. tamarense suggesting that just a small portion of the observed metabolic variability is associated with toxicity. Future experiments aimed at deciphering chemoreception mechanisms of copepod perception of Alexandrium toxicity should consider these metabolites, and the broader lipid classes phosphatidylcholines and sterols, as potential candidate cues.

2021-07-22 | ST001885 | MetabolomicsWorkbench

Dinoroseobacter shibae DFL 12 = DSM 16493

Project description:An aerobic anoxygenic phototrophic bacterium isolated from a marine dinoflagellate

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Roseibium alexandrii strain:PT-S21 | isolate:PT-S21

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Dinoroseobacter shibae DFL 12 = DSM 16493

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