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J Biochem. 1986 Aug;100(2):517-9.

Effect of chymotryptic troponin T subfragments on the calcium ion-sensitivity of ATPase and superprecipitation of actomyosin.


One of the chymotryptic troponin T subfragments, troponin T2, reconstituted approximately 80% of the Ca2+-sensitizing action of troponin T on actomyosin in the presence of troponin C, troponin I, and tropomyosin. This indicates that the Ca2+-regulatory property of troponin T is mostly localized in the troponin T2 region of the C-terminal 101 residues.

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