troponin I, fast skeletal muscle; troponin I, fast-twitch isoform (TNNI2)
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Function
- troponin I is the inhibitory subunit of troponin, the thin filament regulatory complex which confers Ca+2 sensitivity to striated muscle actomyosin ATPase activity
- binds to actin & tropomyosin
Structure
belongs to the troponin I family
Pathology
- defects in TNNI2 are a cause of distal arthrogryposis type 2B