Molecular cloning of cDNA encoding the Ca2+ release channel (ryanodine receptor) of rabbit cardiac muscle sarcoplasmic reticulum - PubMed (original) (raw)
Comparative Study
. 1990 Aug 15;265(23):13472-83.
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- PMID: 2380170
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Comparative Study
Molecular cloning of cDNA encoding the Ca2+ release channel (ryanodine receptor) of rabbit cardiac muscle sarcoplasmic reticulum
K Otsu et al. J Biol Chem. 1990.
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Abstract
We have cloned and sequenced cDNA encoding the Ca2+ release channel (ryanodine receptor) of rabbit cardiac muscle sarcoplasmic reticulum. The cDNA, 16,532 base pairs in length, encodes a protein of 4,969 amino acids with a Mr of 564,711. The deduced amino acid sequence is 66% identical with that of the skeletal muscle ryanodine receptor, but analysis of predicted secondary structures and hydropathy plots suggests that the two isoforms exhibit the same topology in both transmembrane and cytoplasmic domains. A potential ATP binding domain was identified at residues 2619-2652, a potential phosphorylation site at residue 2809, and potential calmodulin binding sites at residues 2775-2807, 2877-2898, and 2998-3016. We suggest that a modulator binding domain in the protein lies between residues 2619 and 3016. Northern blot analysis of mRNA from a variety of tissues demonstrated that the cardiac isoform is expressed in heart and brain, while the skeletal muscle isoform is expressed in both fast- and slow-twitch muscle. No ryanodine receptor mRNA was detected in extracts from smooth muscle or any other non-muscle tissue examined. The two receptors are clearly the products of separate genes, and the gene encoding the cardiac muscle ryanodine receptor was localized to chromosome 1.
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