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Vol. 15, Issue 5, 2218-2229, May 2004

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Rab14 Is Involved in Membrane Trafficking between the Golgi Complex and Endosomes

Jagath R. Junutula ^* , Ann M. De Maziére  , Andrew A. Peden ^*, Karen E. Ervin ^*, Raj J. Advani , Suzanne M. van Dijk , Judith Klumperman , and Richard H. Scheller ^* ||

^* Genentech Inc., South San Francisco, California 94080; Department of Cell Biology and Institute for Biomembranes, University Medical Center, 3584 CX Utrecht, The Netherlands; and Department of Molecular and Cell Physiology, Beckman Center, Stanford University, Stanford, California 94305

Submitted October 31, 2003; Revised January 8, 2004; Accepted February 4, 2004
Monitoring Editor: David Botstein

Rab GTPases are localized to various intracellular compartments and are known to play important regulatory roles in membrane trafficking. Here, we report the subcellular distribution and function of Rab14. By immunofluorescence and immunoelectron microscopy, both endogenous as well as overexpressed Rab14 were localized to biosynthetic (rough endoplasmic reticulum, Golgi, and trans-Golgi network) and endosomal compartments (early endosomal vacuoles and associated vesicles). Notably overexpression of Rab14Q70L shifted the distribution toward the early endosome associated vesicles, whereas the S25N and N124I mutants induced a shift toward the Golgi region. A similar, although less pronounced, redistribution of the transferrin receptor was also observed in cells overexpressing Rab14 mutants. Impairment of Rab14 function did not however affect transferrin uptake or recycling kinetics. Together, these findings suggest that Rab14 is involved in the biosynthetic/recycling pathway between the Golgi and endosomal compartments.

Abbreviations used: EE, early endosome; EEA1, early endosomal antigen 1; GST, glutathione S-transferase; PNS, postnuclear supernatant; RE, recycling endosome; RER, rough endoplasmic reticulum; TfR, transferrin receptor; VTC, vesiculo-tubular cluster.

Online version of this article contains supporting material. Online version is available at www.molbiolcell.org.

These authors contributed equally to this work.

^|| Corresponding author. E-mail address: scheller{at}gene.com.

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