Regulation of early endocytic vesicle motility and fission in a reconstituted system

Journal of Cell Science
Eustratios BananisA W Wolkoff

Abstract

We previously established conditions to reconstitute kinesin-dependent early endocytic vesicle motility and fission on microtubules in vitro. The present study examined the question whether motility and fission are regulated in this system. Screening for proteins by immunofluorescence microscopy revealed that the small G protein, Rab4, was associated with 80% of hepatocyte-derived early endocytic vesicles that contain the ligand asialoorosomucoid (ASOR). By contrast, other markers for early endocytic vesicles including clathrin, Rab5 and EEA1 were present in the preparation but did not colocalize with the ASOR vesicles. Guanine nucleotides exchanged into the Rab4 present on the vesicles as shown by solubilization of Rab4 by Rab-GDI; solubilization was inhibited by incubation with GTP-gamma-S and promoted by GDP. Pre-incubation of vesicles with GDP increased the number of vesicles moving on microtubules and markedly increased vesicle fission. This increase in motility from GDP was shown to be towards the minus end of microtubules, possibly through activation of the minus-end-directed kinesin, KIFC2. Pre-incubation of vesicles with GTP-gamma-S, by contrast, repressed motility. Addition of exogenous GST-Rab4- GTP-gamma-S led to a ...Continue Reading

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