title: Interaction of the PDZ domain of human PICK1 with class I ADP-ribosylation factors.
abstract: We have cloned the cDNA encoding human PICK1 (protein interacting with C kinase 1), a PDZ domain-containing protein of 415 amino acids, and also identified the Drosophila homologue by search of the databank. Northern blot analysis shows a single mRNA of about 2.0 kb ubiquitously expressed in human tissues. Although PICK1 proteins harbor a region homologous to arfaptin1 and arfaptin2, two proteins that bind to the ARF (ADP-ribosylation factor), this region of PICK1 does not interact with ARFs in the yeast two-hybrid system. On the other hand, the PDZ domain of PICK1 is capable of interacting with constitutively active, GTP-bound forms of ARF1 and ARF3, but neither with those of ARF5/6 nor with the GDP-bound ARFs. The PICK1-ARF interaction is abrogated by introduction of mutations in the PDZ domain or by deletion of the extreme C-terminus of ARF1. Thus, PICK1 specifically interacts with ARF1/3 in the GTP-bound state, suggesting that PICK1 participates in ARF1/3-mediated cellular processes.
authors.affiliation: Department of Molecular Biology, Kyushu University Graduate School of Medical Science, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Takeya
authors.forename: K
authors.initials: K
authors.lastname: Takeshige
authors.forename: H
authors.initials: H
authors.lastname: Sumimoto
mesh_terms: D020727:ADP-Ribosylation Factors / Q000378:metabolism*; D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D017173:Caenorhabditis elegans / Q000235:genetics; D002352:Carrier Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins; D004331:Drosophila melanogaster / Q000235:genetics; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic
chemical_list: C105088:ARFIP1 protein, human; C101158:ARFIP2 protein, human; D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D009687:Nuclear Proteins; C498297:PICk1 protein, human; C091822:Prkcabp protein, mouse; D012333:RNA, Messenger; D020727:ADP-Ribosylation Factors; C486477:Arf5 protein, mouse