Another Aerobic Bacterium which Contains Bacteriochlorophyll a

Shiba, Tsuneo; Simidu, Usio; Taga, Nobuo

doi:10.2331/suisan.45.801

Cited by 74 publications

(59 citation statements)

References 3 publications

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“…Most of the global biological activity such as photosynthesis and respiration takes place in the photic zone of the ocean, having a major impact on the overall carbon cycle. It has been recognized for many decades that marine organisms capture energy from sunlight via well-known chlorophyll-based photosynthesis and to a much lesser extent via bacteriochlorophyll-a (Shiba et al, 1979). However, in recent years, it has been found that a third pigment type, proteorhodopsins (PR), may also be important.…”

Section: Introductionmentioning

confidence: 99%

Proteorhodopsin light-enhanced growth linked to vitamin-B1 acquisition in marine Flavobacteria

et al. 2015

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Proteorhodopsins (PR) are light-driven proton pumps widely distributed in bacterioplankton. Although they have been thoroughly studied for more than a decade, it is still unclear how the proton motive force (pmf) generated by PR is used in most organisms. Notably, very few PR-containing bacteria show growth enhancement in the light. It has been suggested that the presence of specific functions within a genome may define the different PR-driven light responses. Thus, comparing closely related organisms that respond differently to light is an ideal setup to identify the mechanisms involved in PR light-enhanced growth. Here, we analyzed the transcriptomes of three PR-harboring Flavobacteria strains of the genus Dokdonia: Dokdonia donghaensis DSW-1 T , Dokdonia MED134 and Dokdonia PRO95, grown in identical seawater medium in light and darkness. Although only DSW-1 T and MED134 showed light-enhanced growth, all strains expressed their PR genes at least 10 times more in the light compared with dark. According to their genomes, DSW-1 T and MED134 are vitamin-B 1 auxotrophs, and their vitamin-B 1 TonB-dependent transporters (TBDT), accounted for 10-18% of all pmf-dependent transcripts. In contrast, the expression of vitamin-B 1 TBDT was 10 times lower in the prototroph PRO95, whereas its vitamin-B 1 synthesis genes were among the highest expressed. Our data suggest that light-enhanced growth in DSW-1 T and MED134 derives from the use of PR-generated pmf to power the uptake of vitamin-B 1 , essential for central carbon metabolism, including the TCA cycle. Other pmf-generating mechanisms available in darkness are probably insufficient to power transport of enough vitamin-B 1 to support maximum growth of these organisms.

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Section: Introductionmentioning

confidence: 99%

Proteorhodopsin light-enhanced growth linked to vitamin-B1 acquisition in marine Flavobacteria

et al. 2015

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“…Schwarz (124) concluded from his investigation of these parameters that there is no important interhemispheric difference in either albedo or the temperature record, and hence no apparent climatic role for sulfate aerosol. His analysis was in turn criticized (37,63,64,74) for the inadequacy of the cited data in quantity, quality and application to refute the hypothesis of Charlson et at. (36).…”

Section: Climatic Implicationsmentioning

confidence: 99%

Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate

Ledyard¹

1993

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“…Aerobic anoxygenic phototrophs (AAPs) were discovered at the end of the 1970s in the Bay of Tokyo (Shiba et al, 1979). These bacteria are related to the facultatively anaerobic purple non-sulfur bacteria, but during evolution they became adapted to an aerobic atmosphere and became obligate aerobes with a heterotrophic metabolism (Yurkov & Beatty, 1998).…”

Section: Introductionmentioning

confidence: 99%

Dinoroseobacter shibae gen. nov., sp. nov., a new aerobic phototrophic bacterium isolated from dinoflagellates

Biebl¹,

Allgaier²,

Tindall

et al. 2005

International Journal of Systematic and Evolutionary Microbiology

183

182

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A novel group of aerobic anoxygenic phototrophic bacteria was isolated from marine dinoflagellates, and two strains were characterized in detail. Cells were Gram-negative cocci or ovoid rods and were motile by means of a single, polarly inserted flagellum. They were obligate aerobes requiring 1-7 % salinity. The optimal pH range for growth was 6?5-9?0 and the temperature optimum was 33 6C. The bacteria contained bacteriochlorophyll a and spheroidenone as the only carotenoid. The in vivo absorption spectrum displayed two maxima in the infrared region at 804 and 868 nm. The distinct 804 nm band indicates the presence of light-harvesting system 2. Various organic carbon sources were assimilated, including many carboxylic acids, glucose and glycerol, but not butyrate, ethanol or methanol. Dissimilatory nitrate reduction was found for both strains. The physiological characteristics of the new strains resembled those of Roseobacter denitrificans, but there were differences in the lipid composition. Based on 16S rRNA gene sequence analysis the new strains are relatively distant from other recognized species, with the closest relatives Jannaschia helgolandensis, Ruegeria atlantica and Rhodobacter veldkampii showing 94?1-93?4 % similarity. Similarity to Roseobacter denitrificans was only 92?2 %, in line with numerous other species of the Roseobacter group. Therefore, it is proposed to classify the strains in a new genus and species within the Roseobacter clade, Dinoroseobacter shibae gen. nov., sp. nov. The type strain is DFL 12 T (=DSM 16493 T =NCIMB 14021 T ).

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Another Aerobic Bacterium which Contains Bacteriochlorophyll a

Cited by 74 publications

References 3 publications

Proteorhodopsin light-enhanced growth linked to vitamin-B1 acquisition in marine Flavobacteria

Proteorhodopsin light-enhanced growth linked to vitamin-B1 acquisition in marine Flavobacteria

Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate

Dinoroseobacter shibae gen. nov., sp. nov., a new aerobic phototrophic bacterium isolated from dinoflagellates

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