title: Huntingtin interacts with the receptor sorting family protein GASP2.
abstract: Protein interaction networks are useful resources for the functional annotation of proteins. Recently, we have generated a highly connected protein-protein interaction network for Huntington's disease (HD) by automated yeast two-hybrid (Y2H) screening (Goehler et al., 2004). The network included several novel direct interaction partners for the disease protein huntingtin (htt). Some of these interactions, however, have not been validated by independent methods. Here we describe the verification of the interaction between htt and GASP2 (G protein-coupled receptor associated sorting protein 2), a protein involved in membrane receptor degradation. Using membrane-based and classical coimmunoprecipitation assays we demonstrate that htt and GASP2 form a complex in cotransfected mammalian cells. Moreover, we show that the two proteins colocalize in SH-SY5Y cells, raising the possibility that htt and GASP2 interact in neurons. As the GASP protein family plays a role in G protein-coupled receptor sorting, our data suggest that htt might influence receptor trafficking via the interaction with GASP2.
authors.affiliation: Department of Neuroproteomics, Max-Delbrück-Centrum for Molecular Medicine (MDC), Berlin, Germany.
authors.forename: S C
authors.initials: SC
authors.lastname: Horn
authors.forename: M
authors.initials: M
authors.lastname: Lalowski
authors.forename: H
authors.initials: H
authors.lastname: Goehler
authors.forename: A
authors.initials: A
authors.lastname: Dröge
authors.forename: E E
authors.initials: EE
authors.lastname: Wanker
authors.forename: U
authors.initials: U
authors.lastname: Stelzl
mesh_terms: D000818:Animals; D019556:COS Cells; D002352:Carrier Proteins / Q000378:metabolism*; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D006801:Humans; D000071058:Huntingtin Protein; D006816:Huntington Disease / Q000378:metabolism*; D047908:Intracellular Signaling Peptides and Proteins; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D009447:Neuroblastoma; D009687:Nuclear Proteins / Q000378:metabolism*; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*; D020798:Two-Hybrid System Techniques
chemical_list: D002352:Carrier Proteins; C516849:GPRASP2 protein, human; C086055:HTT protein, human; D000071058:Huntingtin Protein; D047908:Intracellular Signaling Peptides and Proteins; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D043562:Receptors, G-Protein-Coupled