KRAS Prenylation Is Required for Bivalent Binding with Calmodulin in a Nucleotide-Independent Manner.
Journal
Biophysical journal
ISSN: 1542-0086
Titre abrégé: Biophys J
Pays: United States
ID NLM: 0370626
Informations de publication
Date de publication:
19 03 2019
19 03 2019
Historique:
received:
11
10
2018
revised:
30
01
2019
accepted:
04
02
2019
pubmed:
9
3
2019
medline:
10
4
2020
entrez:
9
3
2019
Statut:
ppublish
Résumé
Deregulation of KRAS4b signaling pathway has been implicated in 30% of all cancers. Membrane localization of KRAS4b is an essential step for the initiation of the downstream signaling cascades that guide various cellular mechanisms. KRAS4b plasma membrane (PM) binding is mediated by the insertion of a prenylated moiety that is attached to the terminal carboxy-methylated cysteine, in addition to electrostatic interactions of its positively charged hypervariable region with anionic lipids. Calmodulin (CaM) has been suggested to selectively bind KRAS4b to act as a negative regulator of the RAS/mitogen-activated protein kinase (MAPK) signaling pathway by displacing KRAS4b from the membrane. However, the mechanism by which CaM can recognize and displace KRAS4b from the membrane is not well understood. In this study, we employed biophysical and structural techniques to characterize this mechanism in detail. We show that KRAS4b prenylation is required for binding to CaM and that the hydrophobic pockets of CaM can accommodate the prenylated region of KRAS4b, which might represent a novel CaM-binding motif. Remarkably, prenylated KRAS4b forms a 2:1 stoichiometric complex with CaM in a nucleotide-independent manner. The interaction between prenylated KRAS4b and CaM is enthalpically driven, and electrostatic interactions also contribute to the formation of the complex. The prenylated KRAS4b terminal KSKTKC-farnesylation and carboxy-methylation is sufficient for binding and defines the minimal CaM-binding motif. This is the same region implicated in membrane and phosphodiesterase6-δ binding. Finally, we provide a structure-based docking model by which CaM binds to prenylated KRAS4b. Our data provide new insights into the KRAS4b-CaM interaction and suggest a possible mechanism whereby CaM can regulate KRAS4b membrane localization.
Identifiants
pubmed: 30846362
pii: S0006-3495(19)30131-6
doi: 10.1016/j.bpj.2019.02.004
pmc: PMC6428923
pii:
doi:
Substances chimiques
Calmodulin
0
Nucleotides
0
Proto-Oncogene Proteins p21(ras)
EC 3.6.5.2
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
1049-1063Subventions
Organisme : NCI NIH HHS
ID : R35 CA197709
Pays : United States
Informations de copyright
Copyright © 2019 Biophysical Society. All rights reserved.
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