title: Molecular basis for two forms of the G protein that stimulates adenylate cyclase.
abstract: Most cells contain two forms of the alpha subunit of the G protein (Gs) that stimulates adenylate cyclase; their apparent molecular weights are 45,000 and 52,000. Two cDNAs that correspond to distinct mRNAs for the alpha subunit of Gs have been cloned from a bovine adrenal library and sequenced. The sequences of the two cDNAs, designated pGs-l and pGs-S, are identical except for a single stretch of 46 nucleotides in the coding region, where four are altered and 42 are deleted in pGs-S. Expression of pGs-S and pGs-l in COS-m6 cells yields protein products with apparent molecular weights of 45,000 and 52,000, respectively, based on their mobility in sodium dodecyl sulfate-polyacrylamide gels. We conclude that pGs-S and pGs-l encode the 45- and 52-kDa forms of Gs alpha, respectively, and propose that the mRNAs encoding these proteins arise from a single gene by internal alternative RNA splicing.
mesh_terms: D000262:Adenylyl Cyclases / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D004247:DNA / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004720:Endonucleases / Q000378:metabolism; D019204:GTP-Binding Proteins / Q000032:analysis* / Q000494:pharmacology; D005786:Gene Expression Regulation; D007163:Immunosorbent Techniques; D008970:Molecular Weight; D012326:RNA Splicing; D012333:RNA, Messenger / Q000378:metabolism; D015719:Single-Strand Specific DNA and RNA Endonucleases; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; D004247:DNA; D004720:Endonucleases; D015719:Single-Strand Specific DNA and RNA Endonucleases; D019204:GTP-Binding Proteins; D000262:Adenylyl Cyclases