Rab GTPases pp 29-45 | Cite as

Rab-NANOPS: FRET Biosensors for Rab Membrane Nanoclustering and Prenylation Detection in Mammalian Cells

  • Arafath Kaja Najumudeen
  • Camilo Guzmán
  • Itziar M. D. Posada
  • Daniel AbankwaEmail author
Part of the Methods in Molecular Biology book series (MIMB, volume 1298)


Rab proteins constitute the largest subfamily of Ras-like small GTPases. They are central to vesicular transport and organelle definition in eukaryotic cells. Unlike their Ras counterparts, they are not a hallmark of cancer. However, a number of diseases, including cancer, show a misregulation of Rab protein activity. As for all membrane-anchored signaling proteins, correct membrane organization is critical for Rabs to operate. In this chapter, we provide a detailed protocol for the use of a flow cytometry-based Fluorescence Resonance Energy Transfer (FRET)-biosensors assay, which allows to detect changes in membrane anchorage, subcellular distribution, and of the nanoscale organization of Rab-GTPases in mammalian cell lines. This assay is high-throughput amenable and can therefore be utilized in chemical-genomic and drug discovery efforts.

Key words

Rab GTPase Geranylgeranylation FRET Flow cytometry Nanocluster Trafficking Membrane Drug discovery 


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Arafath Kaja Najumudeen
    • 1
  • Camilo Guzmán
    • 1
  • Itziar M. D. Posada
    • 1
  • Daniel Abankwa
    • 1
    Email author
  1. 1.Turku Centre for BiotechnologyÅbo Akademi UniversityTurkuFinland

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