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The Repertoire of Heterotrimeric G Proteins and RGS Proteins in Ciona intestinalis

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  • R Prasobh
  • Narayanan Manoj

Abstract

Background: Heterotrimeric G proteins and regulators of G protein signaling (RGS) proteins are key downstream interacting partners in the G protein coupled receptor (GPCR) signaling pathway. The highly versatile GPCR transmembrane signaling system is a consequence of the coupling of a diverse set of receptors to downstream partners that include multiple subforms of G proteins and regulatory proteins including RGS proteins, among others. While the GPCR repertoire of Ciona intestinalis, representing the basal chordate is known, the repertoire of the heterotrimeric G proteins and RGS proteins is unknown. Methodology/Principal Findings: In the present study, we performed an in-silico genome-wide search of C. intestinalis for its complement of G proteins and RGS proteins. The identification of several one-to-one orthologs of human G proteins at the levels of families, subfamilies and types and of homologs of the human RGS proteins suggests an evolutionarily conserved structure function relationship of the GPCR signaling mechanism in the chordates. Conclusions: The C. intestinalis genome encodes a highly conserved, albeit, limited repertoire of the heterotrimeric G protein complexes with the size of subunit types comparable with that in lower eukaryotes.

Suggested Citation

  • R Prasobh & Narayanan Manoj, 2009. "The Repertoire of Heterotrimeric G Proteins and RGS Proteins in Ciona intestinalis," PLOS ONE, Public Library of Science, vol. 4(10), pages 1-11, October.
    • Handle: RePEc:plo:pone00:0007349
    DOI: 10.1371/journal.pone.0007349
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    1. Frédéric Delsuc & Henner Brinkmann & Daniel Chourrout & Hervé Philippe, 2006. "Tunicates and not cephalochordates are the closest living relatives of vertebrates," Nature, Nature, vol. 439(7079), pages 965-968, February.
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