title: Mutually exclusive interactions of EHD1 with GS32 and syndapin II.
abstract: GS32/SNAP-29 is a SNAP-25-like SNARE and has been shown to interact with syntaxin 6. Using immobilized recombinant GS32, we have recovered EHD1 as a major GS32-interacting protein from total HeLa cell extracts. This interaction is mediated by the EH domain of EHD1 and the N-terminal NPF-containing 17-residue region of GS32. Co-immunoprecipitation suggests that GS32 could also interact with EHD1 in intact cells. When immobilized GST-EHD1 was used to fish out interacting proteins from total brain extracts, syndapin II was identified as a major interacting partner. Similar to the GS32-EHD1 interaction, syndapin II also interacts with the EH domain of EHD1 via its NPF repeat region. Interaction of endogenous EHD1 and syndapin II was also established by co-immunoprecipitation. Furthermore, interaction of GS32 and syndapin II with EHD1 was shown to be mutually exclusive, suggesting that EHD1 may regulate/participate in the functional pathways of both GS32 and syndapin II in a mutual exclusive manner. Opposing roles of GS32 and syndapin II in regulating the surface level of transferrin receptor (TfR) were observed.
authors.affiliation: Membrane Biology Laboratory, Institute of Molecular and Cell Biology, Proteos, 61 Biopolis Drive, Singapore 138673, Singapore.
authors.forename: Yue
authors.initials: Y
authors.lastname: Xu
authors.forename: Hong
authors.initials: H
authors.lastname: Shi
authors.forename: Shunhui
authors.initials: S
authors.lastname: Wei
authors.forename: Siew Heng
authors.initials: SH
authors.lastname: Wong
authors.forename: Wanjin
authors.initials: W
authors.lastname: Hong
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism*; D003598:Cytoskeletal Proteins; D015536:Down-Regulation; D006801:Humans; D047468:Immunoprecipitation; D051379:Mice; D008969:Molecular Sequence Data; D011485:Protein Binding; D050766:Qb-SNARE Proteins; D050767:Qc-SNARE Proteins; D015854:Up-Regulation; D033921:Vesicular Transport Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D003598:Cytoskeletal Proteins; C485640:Ehd1 protein, mouse; C492181:Pacsin2 protein, rat; D050766:Qb-SNARE Proteins; D050767:Qc-SNARE Proteins; C117418:Snap29 protein, rat; D033921:Vesicular Transport Proteins