Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 24, Issue 1, Pages 110-121Publisher
WILEY
DOI: 10.1111/1462-2920.15890
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Funding
- Japan Society for the Promotion of Science (JSPS) [17H03007, 20K21383]
- Japan Science and Technology Agency (JST), PRESTO, Japan [JPMJPR1888]
- Israel Science Foundation -F.I.R.S.T. (Bikura) Individual grant [3592/19]
- Grants-in-Aid for Scientific Research [20K21383] Funding Source: KAKEN
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The recently discovered rhodopsin family of heliorhodopsins (HeRs) are found in diverse microbial environments and their functional and biological roles remain unknown. Through experimental and computational screens, 10 readily expressed HeR genes were identified, and they were found to have diverse kinetic characteristics in terms of light absorption and photocycles. Analysis of genes neighboring HeRs suggests a potential involvement in light-induced membrane lipid modifications.
The recently discovered rhodopsin family of heliorhodopsins (HeRs) is abundant in diverse microbial environments. So far, the functional and biological roles of HeRs remain unknown. To tackle this issue, we combined experimental and computational screens to gain some novel insights. Here, 10 readily expressed HeR genes were found using functional metagenomics on samples from two freshwater environments. These HeRs originated from diverse prokaryotic groups: Actinobacteria, Chloroflexi and Archaea. Heterologously expressed HeRs absorbed light in the green and yellow wavelengths (543-562 nm) and their photocycles exhibited diverse kinetic characteristics. To approach the physiological function of the HeRs, we used our environmental clones along with thousands of microbial genomes to analyze genes neighbouring HeRs. The strongest association was found with the DegV family involved in activation of fatty acids, which allowed us to hypothesize that HeRs might be involved in light-induced membrane lipid modifications.
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