Evolution of rhodopsin ion pumps in haloarchaea |
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| Authors: | Adrian K Sharma David A Walsh Eric Bapteste Francisco Rodriguez-Valera W Ford Doolittle R Thane Papke |
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| Affiliation: | (1) Department of Biochemistry and Molecular Biology, Dalhousie University, 5850 College St., Halifax, Nova Scotia, B3H 1X5, Canada;(2) Unidad de Microbiologia, Centro de Biologia Molecular y Celular, Universidad Miguel Hernandez, Campus de xSan Juan, 03550 San Juan, Alicante, Spain |
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| Abstract: | Background The type 1 (microbial) rhodopsins are a diverse group of photochemically reactive proteins that display a broad yet patchy distribution among the three domains of life. Recent work indicates that this pattern is likely the result of lateral gene transfer (LGT) of rhodopsin genes between major lineages, and even across domain boundaries. Within the lineage in which the microbial rhodopsins were initially discovered, the haloarchaea, a similar patchy distribution is observed. In this initial study, we assess the roles of LGT and gene loss in the evolution of haloarchaeal rhodopsin ion pump genes, using phylogenetics and comparative genomics approaches. |
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