Cloning, sequencing and expression of cDNA for a novel subunit of acetylcholine receptor from calf muscle

Toshiyuki Takai, Masaharu Noda, Masayoshi Mishina, Shin Shimizu, Yasuji Furutani, Toshiaki Kayano, Takayuki Ikeda, Tai Kubo, Hideo Takahashi, Tomoyuki Takahashi, Motoy Kuno, Shosaku Numa

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)


The nicotinic acetylcholine receptor (AChR) from fish electric organ has a subunit structure of α2βγδ, and this is thought to be also the case for the mammalian skeletal muscle AChR 1-3. By cloning and sequencing the complementary or genomic DNAs, we have previously elucidated the primary structures of all four sub-units of the Torpedo californica electroplax4-6 and calf muscle AChR 7-10 and of the α- and γ-subunits of the human muscle AChR7,11; the primary structures of the γ-subunit of the T. californien AChR12 and the α-subunit of the Torpedo marmorata AChR13,14 have also been deduced elsewhere. We have now cloned DNA complementary to the calf muscle messenger RNA encoding a novel polypeptide (the ε-subunit) whose deduced amino-acid sequence has features characteristic of the AChR subunits and which shows higher sequence homology with the γ-subunit than with the other subunits. cDNA expression studies indicate that the calf ε-subunit, as well as the calf γ-subunit, can replace the Torpedo γ-subunit to form the functional receptor in combination with the Torpedo α-, β- and δ-subunits.

Original languageEnglish
Pages (from-to)761-764
Number of pages4
Issue number6022
Publication statusPublished - 1985


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