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@ARTICLE{HaroMoreno:1025413,
author = {Haro-Moreno, Jose M. and López-Pérez, Mario and Alekseev,
Alexey and Podoliak, Elizaveta and Kovalev, Kirill and
Gordeliy, Valentin and Stepanauskas, Ramunas and
Rodriguez-Valera, Francisco},
title = {{F}lotillin-associated rhodopsin ({FA}rhodopsin), a
widespread paralog of proteorhodopsin in aquatic bacteria
with streamlined genomes},
journal = {mSystems},
volume = {8},
number = {3},
issn = {2379-5077},
address = {Washington, DC},
publisher = {American Society for Microbiology},
reportid = {FZJ-2024-02872},
pages = {e00008-23},
year = {2023},
abstract = {Microbial rhodopsins are found more than once in a single
genome (paralogs) often have different functions. We
screened a large dataset of open ocean single-amplified
genomes (SAGs) for co-occurrences of multiple rhodopsin
genes. Many such cases were found among Pelagibacterales
(SAR11), HIMB59, and the Gammaproteobacteria
Pseudothioglobus SAGs. These genomes always had a bona fide
proteorhodopsin and a separate cluster of genes containing a
second rhodopsin associated with a predicted flotillin
coding gene and have thus been named flotillin-associated
rhodopsins (FArhodopsins). Although they are members of the
proteorhodopsin protein family, they form a separate clade
within that family and are quite divergent from known
proton-pumping proteorhodopsins. They contain either DTT,
DTL, or DNI motifs in their key functional amino acids.
FArhodopsins are mainly associated with the lower layers of
the epipelagic zone. All marine FArhodopsins had the retinal
binding lysine, but we found relatives in freshwater
metagenomes lacking this key amino acid. AlphaFold
predictions of marine FArhodopsins indicate that their
retinal pocket might be very reduced or absent, hinting that
they are retinal-less. Freshwater FArhodopsins were more
diverse than marine ones, but we could not determine if
there were other rhodopsins in the genome due to the lack of
SAGs or isolates. Although the function of FArhodopsins
could not be established, their conserved genomic context
indicated involvement in the formation of membrane
microdomains. The conservation of FArhodopsins in diverse
and globally abundant microorganisms suggests that they may
be important in the adaptation to the twilight zone of
aquatic environments.},
cin = {IBI-7},
ddc = {570},
cid = {I:(DE-Juel1)IBI-7-20200312},
pnm = {5241 - Molecular Information Processing in Cellular Systems
(POF4-524)},
pid = {G:(DE-HGF)POF4-5241},
typ = {PUB:(DE-HGF)16},
pubmed = {37222519},
UT = {WOS:001026298700001},
doi = {10.1128/msystems.00008-23},
url = {https://juser.fz-juelich.de/record/1025413},
}