Recombinant Human Troponin I fast skeletal muscle protein (denatured)

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

Troponin I fast skeletal muscle also known as TNNI2 is a protein involved in muscle contraction. It weighs around 21.2 kDa and is mainly expressed in fast-twitch skeletal muscle. TNNI2 acts by inhibiting actomyosin ATPase activity meaning it helps prevent muscle contraction until it receives a signal to contract. It binds to actin and plays a regulatory role in the muscle contraction process.

Biological function summary

Troponin I fast skeletal muscle interacts within the troponin complex which includes Troponin T and Troponin C. Located on the thin filament of the muscle fiber this complex modulates the contraction of striated muscle by controlling calcium binding. When calcium binds to Troponin C it induces a conformational change that displaces TNNI2 from actin allowing for muscle contraction to occur.

Pathways

Troponin I fast skeletal muscle has essential functions in the calcium modulation pathways specific to muscle contraction. It plays an important role in the regulation of muscle contraction by interacting with calcium ions and other proteins such as tropomyosin. As part of the excitation-contraction coupling pathway TNNI2 helps ensure the proper contraction of muscles in response to neural stimulation. Additionally its role in these pathways involves specific interactions with proteins like Troponin C and Troponin T which are necessary for functional muscle contraction.

Abnormalities in Troponin I fast skeletal muscle can lead to muscle-related conditions such as nemaline myopathy and distal arthrogryposis. These disorders affect muscle structure and function leading to muscle weakness or deformities. Mutations in TNNI2 may result in improper interaction with other sarcomeric proteins such as tropomyosin disrupting normal muscle contraction and leading to the mentioned diseases. Understanding the role of TNNI2 in these disorders can aid in the development of diagnostic and therapeutic strategies.