Molecular cloning and characterization of Xenopus RGS5.
We identified six genes that encode putative RGS proteins (XRGSI-VI) in developing Xenopus embryos using PCR amplification with degenerate primers corresponding to the conserved region (RGS domain) of known RGS proteins. RT-PCR analysis revealed that mRNAs of these XRGSs are differentially expressed during embryogenesis. At stage 1, only XRGSII mRNA was detected. On the other hand, expression of XRGSVI mRNA increased apparently at stage 14 and expression of three of other XRGS (III, IV, V) elevated between stage 25 and 40. To further characterize XRGS proteins expressed in Xenopus embryos, we isolated a cDNA clone for XRGSIII. Based on determined nucleotide sequence, XRGSIII was considered as a Xenopus homologue of mammalian RGS5 (XRGS5). Genetic analysis using the pheromone response halo assay showed that expression of XRGS5 inhibits yeast response to alpha-factor, suggesting that XRGS5 negatively regulates the G-protein-mediated signaling pathway in developing Xenopus embryos.
Saitoh
O
O
Department of Molecular and Cellular Neurobiology, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashidai, Fuchu-shi, Tokyo, 183-8526, Japan. osaito@tmin.ac.jp
Odagiri
M
M
Masuho
I
I
Nomoto
S
S
Kinoshita
N
N
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001681:Biological Assay; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000378:metabolism; D019204:GTP-Binding Proteins / Q000378:metabolism*; D008969:Molecular Sequence Data; D009842:Oligopeptides; D010675:Pheromones / Q000378:metabolism; D011485:Protein Binding; D020710:RGS Proteins / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D014981:Xenopus / Q000196:embryology* / Q000235:genetics*; D029867:Xenopus Proteins
D005656:Fungal Proteins; D009842:Oligopeptides; D010675:Pheromones; D020710:RGS Proteins; D012333:RNA, Messenger; C491347:Rgs5 protein, Xenopus; D029867:Xenopus Proteins; C097755:arginyl-glycyl-serine; D019204:GTP-Binding Proteins