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Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
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Arg188 drives RhoC membrane binding.

Aditi Patel1, Sophia Williams-Perez1, Nicole Peyton1

  • 1a Department of BCES , Wartburg College , Waverly , IA , USA.

Small Gtpases
|June 30, 2016
PubMed
Summary
This summary is machine-generated.

The RhoC GTPase

Keywords:
RhoARhoCargininemembraneserine

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Area of Science:

  • Molecular Biology
  • Cell Signaling

Background:

  • RhoA and RhoC GTPases share high sequence identity but exhibit distinct functions.
  • Phosphorylation of serine 188 (Ser188) in RhoA typically inhibits its activity.
  • RhoC has arginine at position 188 (Arg188) and a PKA recognition site.

Purpose of the Study:

  • To investigate the functional and regulatory differences between RhoA and RhoC at residue 188.
  • To determine the role of Arg188 in RhoC's membrane association and activity.
  • To explore the impact of residue 188 identity on GTPase membrane binding.

Main Methods:

  • In vitro kinase assays using RhoC variants and PKA.
  • Cellular expression of wild-type and mutant RhoA/RhoC GTPases.
  • GTP loading assays to measure GTPase activity.
  • Membrane association assays to quantify protein localization.

Main Results:

  • RhoC with Arg188 mutated to Serine (RhoC-R188S) was phosphorylated by PKA and showed reduced GTP loading.
  • Wild-type RhoC exhibited greater membrane association than RhoA.
  • Mutations at residue 188 (RhoC-R188S/A, RhoA-S188R) altered membrane association, with Arg188 promoting binding.
  • The effect of Arg188 on membrane association was observed even in constitutively active RhoC.

Conclusions:

  • Residue 188 plays a critical role in differentiating RhoA and RhoC function.
  • Arg188 in RhoC positively influences membrane association, contrasting with Ser188's inhibitory role in RhoA.
  • Swapping residue 188 effectively reverses the membrane binding characteristics of RhoA and RhoC.