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@ARTICLE{Lamm:1028213,
author = {Lamm, Gerrit H. U. and Zabelskii, Dmitrii and Balandin,
Taras and Gordeliy, Valentin and Wachtveitl, Josef},
title = {{C}alcium-{S}ensitive {M}icrobial {R}hodopsin
{V}ir{C}h{R}1: {A} {F}emtosecond to {S}econd {P}hotocycle
{S}tudy},
journal = {The journal of physical chemistry letters},
volume = {15},
number = {20},
issn = {1948-7185},
address = {Washington, DC},
publisher = {ACS},
reportid = {FZJ-2024-04407},
pages = {5510 - 5516},
year = {2024},
abstract = {Viral rhodopsins are light-gated cation channels
representing a novel class of microbial rhodopsins. For
viral rhodopsin 1 subfamily members VirChR1 and OLPVR1,
channel activity is abolished above a certain calcium
concentration. Here we present a calcium-dependent
spectroscopic analysis of VirChR1 on the femtosecond to
second time scale. Unlike channelrhodopsin-2, VirChR1
possesses two intermediate states P1 and P2 on the ultrafast
time scale, similar to J and K in ion-pumping rhodopsins.
Subsequently, we observe multifaceted photocycle kinetics
with up to seven intermediate states. Calcium predominantly
affects the last photocycle steps, including the appearance
of additional intermediates P6Ca and P7 representing the
blocked channel. Furthermore, the photocycle of the
counterion variant D80N is drastically altered, yielding
intermediates with different spectra and kinetics compared
to those of the wt. These findings demonstrate the central
role of the counterion within the defined reaction sequence
of microbial rhodopsins that ultimately defines the protein
function.},
cin = {IBI-7},
ddc = {530},
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 = {38749015},
UT = {WOS:001226083900001},
doi = {10.1021/acs.jpclett.4c00693},
url = {https://juser.fz-juelich.de/record/1028213},
}