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To investigate the functional importance of the C-terminal residues 116 to 148 of troponin I (TnI) in the Ca 2+ -dependent regulation of vertebrate skeletal muscle contraction, we have prepared several synthetic TnI peptide analogs corresponding to various regions within residues 96 to 148 of rabbit skeletal TnI, and analyzed each of these peptides in reconstituted thin filament assays...
A new technique for treating skinned cardiac muscle fibers has been developed in which troponin I is extracted, giving rise to unregulated fibers. The effect of the 12-residue troponin I peptide on these fibers indicates that this region of troponin I is solely responsible for muscle relaxation (inhibition of force). Furthermore, troponin I peptide-troponin C reconstituted fibers are stable through...
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