title: cDNA clone for the alpha subunit of the acetylcholine receptor from the mouse muscle cell line BC3H-1.
abstract: Sequences from a gene coding for mouse acetylcholine receptor alpha subunit have been inserted into a recombinant plasmid and cloned in Escherichia coli. mRNAs for acetylcholine receptors occur in low abundance in vertebrate muscle. To clone the mouse alpha-subunit cDNA, we made use of (i) a cell line, BC3H-1, that overproduces the alpha-subunit mRNA and (ii) a polysome fractionation procedure that results in enrichment of alpha-subunit mRNA. Polyadenylylated RNA was used to construct a cDNA library of 750 recombinant clones. Acetylcholine receptor-specific sequences were identified by hybrid-selected translation, followed by monoclonal antibody precipitation and peptide mapping of the translation product. One clone (pA59) that fit these criteria was found in the first 80 isolates. It had a 700-base-pair insert that was excised with Pst I. Blot-hybridization experiments with nick-translated pA59 DNA showed that BC3H-1 cells contain 100-1,000 times more alpha-subunit mRNA than does newborn or adult mouse muscle. Blot hybridization of restriction digests of mouse liver DNA revealed that pA59 is homologous to a very small number (probably one) of genomic sequences.
mesh_terms: D000818:Animals; D002460:Cell Line; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism*; D004274:DNA, Recombinant / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D008099:Liver / Q000378:metabolism; D046911:Macromolecular Substances; D051379:Mice; D009132:Muscles / Q000378:metabolism*; D009693:Nucleic Acid Hybridization; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics; D011950:Receptors, Cholinergic / Q000235:genetics*
chemical_list: D004274:DNA, Recombinant; D046911:Macromolecular Substances; D012333:RNA, Messenger; D011950:Receptors, Cholinergic; D004247:DNA