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A more recent version of this article appeared on August 1, 2005 Originally published as MBC in Press, 10.1091/mbc.E05-01-0076 on June 1, 2005
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Submitted on January 28, 2005
Revised on April 19, 2005
Accepted on May 23, 2005
*Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany; Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, NJ 08854
Monitoring Editor: Howard Riezman
EHD proteins were shown to function in the exit of receptors and other membrane proteins from the endosomal recycling compartment. Here we identify syndapins, accessory proteins in vesicle formation at the plasma membrane, as differential binding partners for EHD proteins. These complexes are formed by direct eps15-homology (EH) domain/NPF motif interactions. Heterologous and endogenous coimmunoprecipitations as well as reconstitutions of syndapin/EHD protein complexes at intracellular membranes of living cells demonstrate the in vivo relevance of the interaction. The combination of mutational analysis and coimmunoprecipitations performed under different nucleotide conditions strongly suggest that nucleotide binding by EHD proteins modulates the association with syndapins. Colocalization studies and subcellular fractionation experiments support a role for syndapin/EHD protein complexes in membrane trafficking. Specific interferences with syndapin-EHD protein interactions by either overexpression of the isolated EHD-binding interface of syndapin II or of the EHD1 EH domain inhibited the recycling of transferrin to the plasma membrane suggesting that EH domain/NPF interactions are critical for EHD protein function in recycling. Consistently, both inhibitions were rescued by cooverexpression of the attacked protein component. Our data thus reveal that, in addition to a crucial role in endocytic internalization, syndapin protein complexes play an important role in endocytic receptor recycling.
These authors contributed equally to this work.
Address correspondence to:
Britta Qualmann (qualmann{at}ifn-magdeburg.de)
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