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Research Article Free access | 10.1172/JCI112799

Complete complementary DNA-derived amino acid sequence of canine cardiac phospholamban.

J Fujii, A Ueno, K Kitano, S Tanaka, M Kadoma, and M Tada

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Published January 1, 1987 - More info

Published in Volume 79, Issue 1 on January 1, 1987
J Clin Invest. 1987;79(1):301–304. https://doi.org/10.1172/JCI112799.
© 1987 The American Society for Clinical Investigation
Published January 1, 1987 - Version history
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Abstract

Complementary DNA (cDNA) clones specific for phospholamban of sarcoplasmic reticulum membranes have been isolated from a canine cardiac cDNA library. The amino acid sequence deduced from the cDNA sequence indicates that phospholamban consists of 52 amino acid residues and lacks an amino-terminal signal sequence. The protein has an inferred mol wt 6,080 that is in agreement with its apparent monomeric mol wt 6,000, estimated previously by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Phospholamban contains two distinct domains, a hydrophilic region at the amino terminus (domain I) and a hydrophobic region at the carboxy terminus (domain II). We propose that domain I is localized at the cytoplasmic surface and offers phosphorylatable sites whereas domain II is anchored into the sarcoplasmic reticulum membrane.

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