Edg-2/Vzg-1 couples to the yeast pheromone response pathway selectively in response to lysophosphatidic acid.

The Journal of Biological Chemistry
J R EricksonM C Kiefer

Abstract

We have functionally expressed the human cDNA encoding the putative lysophosphatidic acid (LPA) receptor Edg-2 (Vzg-1) in Saccharomyces cerevisiae in an attempt to determine the agonist specificity of this G-protein-coupled receptor. LPA activated the pheromone response pathway in S. cerevisiae expressing Edg-2 in a time- and dose-dependent manner as determined by induction of a pheromone-responsive FUS1::lacZ reporter gene. LPA-mediated activation of the pheromone response pathway was dependent on mutational inactivation of the SST2 gene, the GTPase-activating protein for the yeast G alpha protein (the GPA1 gene product). This indicates that, in sst2 delta yeast cells, Edg-2 can efficiently couple to the yeast heterotrimeric G-protein in response to LPA and activate the yeast mitogen-activated protein kinase pathway. The Edg-2 receptor showed a high degree of specificity for LPA; other lyso-glycerophospholipids, sphingosine 1-phosphate, and diacyl-glycerophospholipids did not activate FUS1::lacZ. LPA analogs including a cyclic phosphoester form and ether-linked forms of LPA activated FUS1::lacZ, although fatty acid chains of 6 and 10 carbons did not activate FUS1::lacZ, suggesting a role for the side chain in ligand binding or...Continue Reading

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