The molecular cloning of the squid (Loligo forbesi) visual Gq-alpha subunit and its expression in Saccharomyces cerevisiae.
The sequence of the alpha-subunit of the major G-protein from the squid (Loligo forbesi) retina was predicted from its cDNA to be a member of the Gq subclass. The abundance of the squid Gq-alpha in the squid photoreceptor membranes suggests that the protein functions in phototransduction; the sequence of this G-protein is consistent with it mediating the light-dependent activation of a phospholipase C. The squid G-alpha was expressed in the yeast Saccharomyces cerevisiae, where it was unable to replace the function of GPA1, the yeast G-alpha homologue that regulates the mating response, suggesting that Gq-alpha was unable to interact with the endogenous G-beta gamma (STE4-STE18).
Department of Biochemistry and Molecular Biology, University of Leeds, U.K.
N J
NJ
Ryba
J B
JB
Findlay
J D
JD
Reid
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA; D049832:Decapodiformes; D019204:GTP-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D010786:Photoreceptor Cells / Q000378:metabolism*; D010957:Plasmids; D051381:Rats; D012441:Saccharomyces cerevisiae; D017386:Sequence Homology, Amino Acid
D004247:DNA; D019204:GTP-Binding Proteins