G-protein-linked signal transduction systems control development in Dictyostelium.

Published

Journal Article

G-protein-linked cAMP receptors play an essential role in Dictyostelium development. The cAMP receptors are proposed to have seven transmembrane domains and a cytoplasmic C-terminal region. Overexpression of the receptor in cells, when the endogenous receptor is not present, results in a 10- to 50-fold increase in cAMP-binding sites. Antisense cell lines, which lack cAMP receptors, do not enter the developmental program. Ligand-induced phosphorylation is proposed to occur on serine and threonine residues in the receptor C-terminus. The kinetics of receptor phosphorylation and dephosphorylation correlate closely with the shift of receptor mobility and the adaptation of several cAMP-induced responses. Two alpha-subunits, G-alpha-1 and G-alpha-2, have been cloned and specific antisera developed against each. Both subunits are expressed as multiple RNAs with different developmental time courses. The mutant Frigid A has a functional defect in G-alpha-2 which prevents it from entering development. We propose that G-protein-linked receptor systems will be a major component in the development of many organisms.

Full Text

Duke Authors

Cited Authors

  • Johnson, RL; Gundersen, R; Lilly, P; Pitt, GS; Pupillo, M; Sun, TJ; Vaughan, RA; Devreotes, PN

Published Date

  • 1989

Published In

Volume / Issue

  • 107 Suppl /

Start / End Page

  • 75 - 80

PubMed ID

  • 2517628

Pubmed Central ID

  • 2517628

International Standard Serial Number (ISSN)

  • 0950-1991

Language

  • eng

Conference Location

  • England