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- W2088485685 abstract "Myosin binding protein C (MyBP-C) is a thick-filament protein that limits cross-bridge cycling rates and reduces myocyte power output. To investigate mechanisms by which MyBP-C affects contraction, we assessed effects of recombinant N-terminal domains of cardiac MyBP-C (cMyBP-C) on contractile properties of permeabilized rat cardiac trabeculae. Here, we show that N-terminal fragments of cMyBP-C that contained the first three immunoglobulin domains of cMyBP-C (i.e., C0, C1, and C2) plus the unique linker sequence termed the MyBP-C “motif” or “m-domain” increased Ca2+ sensitivity of tension and increased rates of tension redevelopment (i.e., ktr) at submaximal levels of Ca2+. At concentrations ≥20 μM, recombinant proteins also activated force in the absence of Ca2+ and inhibited maximum Ca2+-activated force. Recombinant proteins that lacked the combination of C1 and the motif did not affect contractile properties. These results suggest that the C1 domain plus the motif constitute a functional unit of MyBP-C that can activate the thin filament." @default.
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- W2088485685 date "2008-10-27" @default.
- W2088485685 modified "2023-10-13" @default.
- W2088485685 title "Contribution of the Myosin Binding Protein C Motif to Functional Effects in Permeabilized Rat Trabeculae" @default.
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- W2088485685 doi "https://doi.org/10.1085/jgp.200810013" @default.
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