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Title: The RIT1 C-terminus associates with lipid bilayers via charge complementarity

Journal Article · · Computational Biology and Chemistry
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Nonlinear Studies; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Biology and Biophysics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Biology and Biophysics

RIT1 is a member of the Ras superfamily of small GTPases involved in regulation of cellular signaling. Mutations to RIT1 are involved in cancer and developmental disorders. Like many Ras subfamily members, RIT1 is localized to the plasma membrane. However, RIT1 lacks the C-terminal prenylation that helps many other subfamily members adhere to cellular membranes. For this study, we used molecular dynamics simulations to examine the mechanisms by which the C-terminal peptide (CTP) of RIT1 associates with lipid bilayers. We show that the CTP is unstructured and that its membrane interactions depend on lipid composition. While a 12-residue region of the CTP binds strongly to anionic bilayers containing phosphatidylserine lipids, the CTP termini fray from the membrane allowing for accommodation of the RIT1 globular domain at the membrane-water interface.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC5206NA25396
OSTI ID:
1890970
Alternate ID(s):
OSTI ID: 1809776
Report Number(s):
LA-UR-19-32749
Journal Information:
Computational Biology and Chemistry, Vol. 91; ISSN 1476-9271
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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