Assay of Rab4-dependent trafficking on microtubules

John W. Murray, Allan W. Wolkoff

Research output: Contribution to journalReview articlepeer-review

13 Scopus citations


We present an in vitro method to measure how Rab4 and other regulatory proteins affect microtubule-based organelle motility. The protocols utilize small-volume, disposable "microchambers" designed for epifluorescence, confocal, or other microscope platforms and into which microtubules, organelles, and primary and fluorescent secondary antibodies are added. Our work has focused on the isolation and use of endocytic vesicles from rat liver, and we present these protocols. However, the techniques can be adapted for other organelles or cell types. Multiple fluorescent probes, rapid image capture, and immunofluorescence under nonfixation conditions allow for measurements of the location and intensity changes of endogenous proteins upon addition of ATP or upon addition of other proteins or regulatory factors. We review measurements of microtubule-based motility as well as measurements for protein localization and protein segregation in vitro.

Original languageEnglish (US)
Article number9
Pages (from-to)92-107
Number of pages16
JournalMethods in enzymology
StatePublished - 2005

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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