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Rab11‐ FIP2 Interaction with MYO5B Regulates Movement of Rab11a‐Containing Recycling Vesicles
Author(s) -
Schafer Jenny C.,
Baetz Nicholas W.,
Lapierre Lynne A.,
McRae Rebecca E.,
Roland Joseph T.,
Goldenring James R.
Publication year - 2014
Publication title -
traffic
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.677
H-Index - 130
eISSN - 1600-0854
pISSN - 1398-9219
DOI - 10.1111/tra.12146
Subject(s) - biology , microbiology and biotechnology , endosome , internalization , biochemistry , cell , intracellular
A tripartite association of Rab11a with both Rab11‐ FIP2 and MYO5B regulates recycling endosome trafficking. We sought to define the intermolecular interactions required between Rab11‐ FIP2 and MYO5B . Using a random mutagenesis strategy, we identified point mutations at S229P or G233E in Rab11‐ FIP2 that caused loss of interaction with MYO5B in yeast two‐hybrid assays as well as loss of interaction of Rab11‐ FIP2 (129‐356) with MYO5B tail when expressed in HeLa cells. Single mutations or the double S229P / G233E mutation failed to alter the association of full‐length Rab11‐ FIP2 with MYO5B tail in HeLa cells. While EGFP ‐Rab11‐ FIP2 wild type colocalized with endogenous MYO5B staining in MDCK cells, EGFP ‐Rab11‐ FIP2 ( S229P / G233E ) showed a significant decrease in localization with endogenous MYO5B . Analysis of Rab11a‐containing vesicle movement in live HeLa cells demonstrated that when the MYO5B /Rab11‐ FIP2 association is perturbed by mutation or by Rab11‐ FIP2 knockdown, vesicle movement is increased in both speed and track length, consistent with an impairment of MYO5B tethering at the cytoskeleton. These results support a critical role for the interaction of MYO5B with Rab11‐ FIP2 in stabilizing the functional complex with Rab11a, which regulates dynamic movements of membrane recycling vesicles.