Sensory Rhodopsin I and Sensory Rhodopsin II Form Trimers of Dimers in Complex with their Cognate Transducers

Photochemistry and Photobiology
Philipp OrekhovM Engelhard

Abstract

Archaeal photoreceptors consist of sensory rhodopsins in complex with their cognate transducers. After light excitation, a two-component signaling chain is activated, which is homologous to the chemotactic signaling cascades in enterobacteria. The latter system has been studied in detail. From structural and functional studies, a picture emerges which includes stable signaling complexes, which assemble to receptor arrays displaying hexagonal structural elements. At this higher order structural level, signal amplification and sensory adaptation occur. Here, we describe electron microscopy data, which show that also the archaeal phototaxis receptors sensory rhodopsin I and II in complex with their cognate transducers can form hexagonal lattices even in the presence of a detergent. This result could be confirmed by molecular dynamics calculations, which revealed similar structural elements. Calculations of the global modes of motion displayed one mode, which resembles the "U"-"V" transition of the NpSRII:NpHtrII complex, which was previously argued to represent a functionally relevant global conformational change accompanying the activation process [Ishchenko et al. (2013) J. Photochem. Photobiol. B 123, 55-58]. A model of coopera...Continue Reading

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Jul 20, 2018·Cell Biochemistry and Biophysics·Katerina ChristofidesChristopher E Jones
May 2, 2020·International Journal of Molecular Sciences·Ivan GushchinValentin Gordeliy
Dec 28, 2017·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Ivan Gushchin, Valentin Gordeliy
Jun 3, 2021·International Journal of Molecular Sciences·Ivan GushchinValentin Gordeliy
May 26, 2021·Scientific Reports·Yury L RyzhykauValentin I Gordeliy
Nov 3, 2021·Acta Crystallographica. Section D, Structural Biology·Yury L RyzhykauAlexander I Kuklin

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