Cardiotin is a recently discovered, high molecular weight protein complex (~300 kDa) located in the longitudinal SR of cardiomyocytes. The cardiotin complex exists as 60 kDa and 100 kDa subunits. Both subunits contain the same amino-terminal 14 amino-acid sequence, and show high homology to human skeletal muscle alpha-actin. The tetrameric configuration of the cardiotin protein complex suggests that it exists as a transmembrane complex with the N-terminus at the cytoplasmic side of the membrane, able to interact with actin. Immunofluorescence studies colocalize cardiotin with SERCA 2a ATPase in the longitudinal sarcoplasmic reticulum (SR), although cardiotin is not expressed in junctional SR with SERCA 2.View more
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