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Microbial rhodopsins: functional versatility and genetic mobility

Author:
Sharma, Adrian K.  Spudich, John L.  Doolittle, W. Ford  


Journal:
TRENDS IN MICROBIOLOGY


Issue Date:
2006


Abstract(summary):

The type 1 (microbial) rhodopsins are a diverse group of photochemically reactive proteins that span the three domains of life. Their broad phylogenetic distribution has motivated conjecture that rhodopsin-like functionality was present in the last common ancestor of all life. Here, we discuss the evolution of the type 1 microbial rhodopsins and document five cases of lateral gene transfer (LGT) between domains. We suggest that, thanks to the functional versatility of these retinylidene proteins and the relative ease with which they can complement the existing energy-generating or photosensory repertoires of many organisms, LGT is in fact the principal force that determines their broad but patchy distribution.


Page:
463---469


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