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(Received for publication, August 20, 1996, and in revised form, October 29, 1996)
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From the An FP prostanoid receptor isoform, which appears
to arise from alternative mRNA splicing, has been cloned from a
mid-cycle ovine large cell corpus luteum library. The isoform, named
the FPB receptor, is identical to the original isoform, the
FPA, throughout the seven transmembrane domains, but
diverges nine amino acids into the carboxyl terminus. In contrast to
FPA, whose carboxyl terminus continues for another 46 amino
acids beyond the nine shared residues, the FPB terminates
after only one amino acid. The FPA isoform appears to arise
by the failure to utilize a potential splice site, while a 3.2-kilobase
pair intron is spliced out from the FP gene to generate the
FPB isoform mRNA. The two isoforms have
indistinguishable radioligand binding properties, but seem to differ in
functional coupling to phosphatidylinositol hydrolysis. Thus, in COS-7
cells transiently transfected with either the FPA or the
FPB receptor cDNAs, prostaglandin F2
Departments of Pharmacology and Toxicology
and ¶ Physiology, The University of Arizona, Tucson, Arizona 85721 and
Allergan, Inc., Department of Biological Sciences,
Irvine, California 92713-9534
stimulates inositol phosphate accumulation to the same absolute
maximum, but the basal level of inositol phosphate accumulation is
approximately 1.3-fold higher in cells transfected with the
FPB as compared with cells transfected with the
FPA isoform. Using the polymerase chain reaction, mRNA
encoding the FPB isoform was identified in the ovine corpus luteum.
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