The actin consists of two globular subunits (alpha and beta) as dimers. These dimers are helically wound fibrillar chains. On this chain of actin, are also the Tropomyosin and T roponina , Both important for muscle contraction. Troponin is made up of three subunits: subunit C, subunit I subunit T and
subunit C binds the calcium ion (Ca + +) and this binding changes the conformation of troponin-dimensional. T
subunit: binds to tropomyosin
subunit I, is blocking a binding site for myosin on actin.
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