Suppression of prostaglandin E receptor signaling by the variant form of EP1 subtype.

The Journal of Biological Chemistry
E Okuda-AshitakaO Hayaishi

Abstract

A cDNA clone of prostaglandin (PG) E receptor EP1 subtype (rEP1) was isolated from a rat uterus cDNA library. It encodes 405 amino acid residues with seven transmembrane-spanning domains and couples to Ca2+ mobilization. In addition, three cDNA clones encoding a variant form of rEP1 were isolated. The open reading frame can code a 366-amino acid protein carrying a specific change of 49 amino acids from the middle of transmembrane segment VI to COOH terminus; it possesses a transmembrane segment VII-like structure lacking an intracellular COOH-terminal tail. Southern blot analysis of rat genomic DNA and genomic polymerase chain reaction demonstrated that these cDNAs were derived from a single copy gene. Northern blot analysis and ribonuclease protection assay revealed that both rEP1 and rEP1-variant receptor mRNAs were highly expressed in the kidney. Immunoblot with an antibody directed toward the specific region of rEP1-variant receptor showed that rEP1-variant receptor protein was expressed in the membrane of the kidney and Chinese hamster ovary (CHO) cells transfected with rEP1-variant cDNA. Thus, the rEP1-variant receptor is translated from mRNA which is not spliced at nucleotide position 952 in the segment VI transmembrane ...Continue Reading

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