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A Proteorhodopsin-Related Photosensor Expands the Repertoire of Structural Motifs Employed by Sensory Rhodopsins

J Phys Chem B. 2023-09; 
Maryam Saliminasab, Yoichi Yamazaki, Alyssa Palmateer, Andrew Harris, Luiz Schubert, Pit Langner, Joachim Heberle, Ana-Nicoleta Bondar, Leonid S Brown
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摘要

Microbial rhodopsins are light-activated retinal-binding membrane proteins that perform a variety of ion transport and photosensory functions. They display several cases of convergent evolution where the same function is present in unrelated or very distant protein groups. Here we report another possible case of such convergent evolution, describing the biophysical properties of a new group of sensory rhodopsins. The first representative of this group was identified in 2004 but none of the members had been expressed and characterized. The well-studied haloarchaeal sensory rhodopsins interacting with methyl-accepting Htr transducers are close relatives of the halobacterial proton pump bacteriorhodopsin. In contr... More

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