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@ARTICLE{Pfleger:890419,
author = {Pfleger, Christopher and Kusch, Jana and Kondapuram, Mahesh
and Schwabe, Tina and Sattler, Christian and Benndorf, Klaus
and Gohlke, Holger},
title = {{A}llosteric signaling in {C}-linker and cyclic
nucleotide-binding domain of {HCN}2 channels},
journal = {Biophysical journal},
volume = {120},
number = {5},
issn = {0006-3495},
address = {Bethesda, Md.},
publisher = {Soc.},
reportid = {FZJ-2021-00939},
pages = {950-963},
year = {2021},
abstract = {Opening of hyperpolarization-activated cyclic
nucleotide-modulated (HCN) channels is controlled by
membrane hyperpolarization and binding of cyclic nucleotides
to the tetrameric cyclic nucleotide-binding domain (CNBD),
attached to the C-linker disk (CL). Confocal patch-clamp
fluorometry revealed pronounced cooperativity of ligand
binding among protomers. However, by which pathways
allosteric signal transmission occurs remained elusive.
Here, we investigate how changes in the structural dynamics
of the CL-CNBD of mouse HCN2 upon cAMP binding relate to
inter- and intrasubunit signal transmission. Applying a
rigidity theory-based approach, we identify two intersubunit
and one intrasubunit pathways that differ in allosteric
coupling strength between cAMP binding sites or towards the
CL. These predictions agree with results from
electrophysiological and patch-clamp fluorometry
experiments. Our results map out distinct routes within the
CL-CNBD that modulate different cAMP binding responses in
HCN2 channels. They signify that functionally relevant
submodules may exist within and across structurally
discernable subunits in HCN channels.},
cin = {JSC / NIC / IBI-7},
ddc = {570},
cid = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)NIC-20090406 /
I:(DE-Juel1)IBI-7-20200312},
pnm = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
(SDLs) and Research Groups (POF4-511) / Forschergruppe
Gohlke $(hkf7_20200501)$},
pid = {G:(DE-HGF)POF4-5111 / $G:(DE-Juel1)hkf7_20200501$},
typ = {PUB:(DE-HGF)16},
pubmed = {33515603},
UT = {WOS:000630953600021},
doi = {10.1016/j.bpj.2021.01.017},
url = {https://juser.fz-juelich.de/record/890419},
}