title: Identification and characterization in Xenopus of XsmgGDS, a RalB binding protein.
abstract: We have previously isolated a cDNA coding for a RalB protein from a Xenopus maternal library. By mutagenesis of RalB and microinjection of its mRNA in embryos we show that RalB is involved in Xenopus early development. We have used the yeast two-hybrid system to screen a Xenopus maternal cDNA library in order to isolate proteins interacting to RalB. We have identified a full-length cDNA encoding a protein homologous to mammalian smgGDS. The Xenopus gene shows 84.6% identity with the mammalian counterpart and contains one additional armadillo repeat. The XsmgGDS mRNA is expressed from oogenesis up to late embryogenesis at a higher level than that in adult tissues. Thus RalB is another protein that interacts with smgGDS which suggests that RalB may be activated by a Ras independent pathway.
authors.affiliation: Institut Jacques MONOD. CNRS, Université Paris VII, France.
authors.forename: N
authors.initials: N
authors.lastname: Iouzalen
authors.forename: J
authors.initials: J
authors.lastname: Camonis
authors.forename: J
authors.initials: J
authors.lastname: Moreau
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D019204:GTP-Binding Proteins / Q000235:genetics* / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics; D016415:Sequence Alignment; D014981:Xenopus / Q000235:genetics*; D020725:ral GTP-Binding Proteins; D020668:rap GTP-Binding Proteins
chemical_list: D012333:RNA, Messenger; C082190:Ralb protein, rat; D019204:GTP-Binding Proteins; D020725:ral GTP-Binding Proteins; D020668:rap GTP-Binding Proteins