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Dual prenylation is required for Rab protein localization and function.

Monica Calero1, Catherine Z Chen, Wenyan Zhu

  • 1Department of Molecular Medicine, Cornell University, Ithaca, New York 14853-6401, USA.

Molecular Biology of the Cell
|June 13, 2003
PubMed
Summary

Specific prenylation of Rab proteins with double geranylgeranyl groups is crucial for their membrane localization and function. Alternative lipid tails on Rab GTPases do not support essential cellular processes, highlighting prenylation

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Rab proteins are essential small GTPases involved in intracellular trafficking.
  • Most Rab proteins undergo post-translational modification with two geranylgeranyl lipid moieties, facilitating membrane association.

Purpose of the Study:

  • To investigate the specific lipid requirements for Rab protein localization and function.
  • To determine the significance of double prenylation for Rab GTPase activity and membrane targeting.

Main Methods:

  • Substitution of different prenyl anchors on Rab GTPases.
  • Analysis of the essential Rab genes YPT1 and SEC4 in Saccharomyces cerevisiae.
  • Identification and characterization of Yip1p, a protein interacting with di-geranylgeranylated Rabs.

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Main Results:

  • Alternative lipid tails on Rab GTPases do not support correct function or cell viability.
  • Double geranyl-geranyl groups are essential for the proper localization of Rab proteins to specific organelle membranes.
  • Yip1p specifically binds di-geranylgeranylated Rab proteins, but not mono-prenylated forms.

Conclusions:

  • The double prenylation of Rab proteins is a critical determinant of their localization and function.
  • Specific prenylation patterns are essential for the biological activity of the Rab GTPase family.