Calsarcins, a novel family of sarcomeric calcineurin-binding proteins

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Abstract

The calcium- and calmodulin-dependent protein phosphatase calcineurin has been implicated in the transduction of signals that control the hypertrophy of cardiac muscle and slow fiber gene expression in skeletal muscle. To identify proteins that mediate the effects of calcineurin on striated muscles, we used the calcineurin catalytic subunit in a two-hybrid screen for cardiac calcineurininteracting proteins. From this screen, we discovered a member of a novel family of calcineurin-interacting proteins, termed calsarcins, which tether calcineurin to α-actinin at the z-line of the sarcomere of cardiac and skeletal muscle cells. Calsarcin-1 and calsarcin-2 are expressed in developing cardiac and skeletal muscle during embryogenesis, but calsarcin-1 is expressed specifically in adult cardiac and slow-twitch skeletal muscle, whereas calsarcin-2 is restricted to fast skeletal muscle. Calsarcins represent a novel family of sarcomeric proteins that link calcineurin with the contractile apparatus, thereby potentially coupling muscle activity to calcineurin activation.

Original languageEnglish (US)
Pages (from-to)14632-14637
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume97
Issue number26
DOIs
StatePublished - Dec 19 2000

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