Molecular cloning of a novel splice variant of the α subunit of the mammalian Go protein

Walter H. Hsu, Uwe Rudolph, Jack Sanford, Philippe Bertrand, Juan Olate, Christian Nelson, Larry G. Moss, Aubrey E. Boyd, Juan Codina, Lutz Birnbaumer

Research output: Contribution to journalArticlepeer-review


We screened a HIT (hamster insulin-secreting tumor) cell cDNA library constructed in λ gt11 with a Go-specific oligonucleotide probe and isolated six recombinant phages. The inserts of these phages encoded two forms of αo, called here αo1 and αo2. The deduced amino acid sequence of αo1 is identical in all of its 354 amino acids to that reported previously for rat and bovine αo; that of αo2, also of 354 amino acids, is identical to αo1 up to and including amino acid 248 and differs thereafter in 26 amino acids. At the nucleotide level, αo1 and αo2 are identical up to and including the second base of the codon that specifies amino acid 243 and differs thereafter in 88 nucleotides of the remaining open reading frame and has no similarity to αo1 in its 3′-untranslated region. We propose that αo1 and αo2 result as a consequence of alternative splicing of a single αo transcript. Northern analysis with specifically designed oligonucleotides indicates that both forms of αo are expressed in normal tissues, e.g. brain. After in vitro transcription and translation, the peptides encoded in the αo1 and αo2 cDNAs could be ADP-ribosylated by pertussis toxin in the presence of added βγ dimers. The count of distinct G proteins keeps increasing.

Original languageEnglish (US)
Pages (from-to)11220-11226
Number of pages7
JournalJournal of Biological Chemistry
Issue number19
StatePublished - Jul 5 1990
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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