(from the article `muscle`) Troponin is a complex of three different protein subunits. One troponin complex is bound to every tropomyosin molecule. A troponin molecule is ...
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http://www.britannica.com/eb/a-z/t/84
<protein> Complex of three proteins, Troponins C, I, & T, associated with tropomyosin and actin on the thin filament of striated muscle, upon which it confers calcium sensitivity. There is one troponin complex per tropomyosin. Troponin C (18 kD) binds calcium ions reversibly, has a variable number of EF hand motifs and is the least variab...
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http://www.encyclo.co.uk/local/20973
(tro´po-nin) a complex of muscle proteins which, when combined with Ca++, influence tropomyosin to initiate contraction.
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http://www.encyclo.co.uk/local/21001
Complex of three proteins, troponins C, I, and T, associated with tropomyosin and actin on the thin filament of striated muscle, upon which it confers calcium sensitivity. There is one troponin complex per tropomyosin. Troponin C (18 kD) binds calcium ions reversibly, has a variable number of EF-hand motifs and is the least variable of the subunits. TnC binds TnI and TnT, but not actin. Troponin I (23 kD) binds to actin and at 1:1 stoichiometry can inhibit the actin-myosin interaction on its own. Troponin T (37 kD) binds strongly to tropomyosin.
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http://www.encyclo.co.uk/visitor-contributions.php
Type: Term Pronunciation: trō′pō-nin Definitions: 1. A globular protein of muscle that binds to tropomyosin and has considerable affinity for calcium ions; a central regulatory protein of muscle contraction. Troponin T binds to tropomyosin; troponin I inhibits F-actin-myosin interactions; troponin C is a calcium-binding protein and ...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=94210
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