Structural evidence for visual arrestin priming via complexation of phosphoinositols.
(1,4,5) myo-D-inositol triphosphate
G protein-coupled receptor
GPCR
InsP(3)
InsP(6)
arrestin
crystal structure
myo-D-inositol hexakisphosphate
phospholipase C
photoreceptor
phototransduction
retina
vision
Journal
Structure (London, England : 1993)
ISSN: 1878-4186
Titre abrégé: Structure
Pays: United States
ID NLM: 101087697
Informations de publication
Date de publication:
03 02 2022
03 02 2022
Historique:
received:
28
07
2021
revised:
06
09
2021
accepted:
29
09
2021
pubmed:
23
10
2021
medline:
22
3
2022
entrez:
22
10
2021
Statut:
ppublish
Résumé
Visual arrestin (Arr1) terminates rhodopsin signaling by blocking its interaction with transducin. To do this, Arr1 translocates from the inner to the outer segment of photoreceptors upon light stimulation. Mounting evidence indicates that inositol phosphates (InsPs) affect Arr1 activity, but the Arr1-InsP molecular interaction remains poorly defined. We report the structure of bovine Arr1 in a ligand-free state featuring a near-complete model of the previously unresolved C-tail, which plays a crucial role in regulating Arr1 activity. InsPs bind to the N-domain basic patch thus displacing the C-tail, suggesting that they prime Arr1 for interaction with rhodopsin and help direct Arr1 translocation. These structures exhibit intact polar cores, suggesting that C-tail removal by InsP binding is insufficient to activate Arr1. These results show how Arr1 activity can be controlled by endogenous InsPs in molecular detail.
Identifiants
pubmed: 34678158
pii: S0969-2126(21)00370-1
doi: 10.1016/j.str.2021.10.002
pmc: PMC8818024
mid: NIHMS1753853
pii:
doi:
Substances chimiques
Arrestin
0
Inositol Phosphates
0
Rhodopsin
9009-81-8
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
263-277.e5Subventions
Organisme : NEI NIH HHS
ID : R01 EY009339
Pays : United States
Organisme : BLRD VA
ID : I01 BX004939
Pays : United States
Organisme : NEI NIH HHS
ID : P30 EY025585
Pays : United States
Organisme : NIGMS NIH HHS
ID : P41 GM111244
Pays : United States
Organisme : NIGMS NIH HHS
ID : P30 GM124165
Pays : United States
Organisme : NEI NIH HHS
ID : R24 EY024864
Pays : United States
Organisme : NIGMS NIH HHS
ID : P41 GM103393
Pays : United States
Organisme : NIGMS NIH HHS
ID : T32 GM007250
Pays : United States
Organisme : NEI NIH HHS
ID : P30 EY011373
Pays : United States
Organisme : NIGMS NIH HHS
ID : P30 GM133893
Pays : United States
Organisme : NEI NIH HHS
ID : T32 EY007157
Pays : United States
Organisme : CIHR
ID : PJT-159464
Pays : Canada
Organisme : NEI NIH HHS
ID : R24 EY027283
Pays : United States
Organisme : NEI NIH HHS
ID : F30 EY031566
Pays : United States
Informations de copyright
Copyright © 2021 Elsevier Ltd. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of interests The authors declare no competing interests.
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