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Troponin C is a protein which is part of the troponin complex. It contains four calcium-binding EF hands , although different isoforms may have fewer than four functional calcium-binding subdomains. It is a component of thin filaments , along with actin and tropomyosin .
Troponin is a component of thin filaments (along with actin and tropomyosin), and is the protein complex to which calcium binds to trigger the production of muscular force. Troponin has three subunits, TnC, TnI, and TnT, each playing a role in force regulation.
Troponin C, also known as TN-C or TnC, is a protein that resides in the troponin complex on actin thin filaments of striated muscle (cardiac, fast-twitch skeletal, or slow-twitch skeletal) and is responsible for binding calcium to activate muscle contraction.
Troponin C, skeletal muscle is a protein that in humans is encoded by the TNNC2 gene. [ 5 ] [ 6 ] Troponin (Tn), is a key protein complex in the regulation of striated muscle contraction , composed of three subunits.
Test Sensitivity and specificity Approximate peak Description Troponin test: The most sensitive and specific test for myocardial damage. Because it has increased specificity compared with CK-MB, troponin is composed of 3 proteins- Troponin C, Cardic troponin I, and Cardiac troponin T. Troponin I especially has a high affinity for myocardial injury.
The EF hand is a helix–loop–helix structural domain or motif found in a large family of calcium-binding proteins.. The EF-hand motif contains a helix–loop–helix topology, much like the spread thumb and forefinger of the human hand, in which the Ca 2+ ions are coordinated by ligands within the loop.
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These calcium ions bind to a protein called troponin, which initiates the process of muscle contraction. [50] Calcium sensitizers function by binding to cardiac troponin C, thereby enhancing the sensitivity of heart muscle cells to naturally occurring calcium ions. [51]
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