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Troponin I from human heart can be used in studies whether the actin and aldolase can protect rabbit muscle lactate dehydrogenase inhibition by ascorbate or not.

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Native troponin I purified from human heart. Inhibitory subunit of troponin that binds to actin in the absence of Ca²⁺, thus inhibiting the ATPase activity of actomyosin. Presence of Tnl in plasma has been used for early detection of myocardial infarction. Useful as a standard in immunoassay and as an immunogen for anti-sera production. Also useful as a tracer for iodination.

Biochem/physiol Actions

Troponin I interacts with tropomyosin for regulating the contraction of striated muscle in a calcium-dependent manner. Additionally, Troponin I can also inhibits actomyosin ATPase and serves as a selective and potent inhibitor of angiogenesis in vivo and in vitro and of tumor metastasis in vivo.

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