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• W2238264572 endingPage "1112" @default.
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• W2238264572 abstract "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-1T, Dokdonia MED134 and Dokdonia PRO95, grown in identical seawater medium in light and darkness. Although only DSW-1T 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-1T and MED134 are vitamin-B1 auxotrophs, and their vitamin-B1 TonB-dependent transporters (TBDT), accounted for 10–18% of all pmf-dependent transcripts. In contrast, the expression of vitamin-B1 TBDT was 10 times lower in the prototroph PRO95, whereas its vitamin-B1 synthesis genes were among the highest expressed. Our data suggest that light-enhanced growth in DSW-1T and MED134 derives from the use of PR-generated pmf to power the uptake of vitamin-B1, 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-B1 to support maximum growth of these organisms." @default.
• W2238264572 created "2016-06-24" @default.
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• W2238264572 date "2015-11-17" @default.
• W2238264572 modified "2023-10-03" @default.
• W2238264572 title "Proteorhodopsin light-enhanced growth linked to vitamin-B1 acquisition in marine Flavobacteria" @default.
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• W2238264572 doi "https://doi.org/10.1038/ismej.2015.196" @default.
• W2238264572 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5029205" @default.
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