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Role of magnesium atp in the contractile kinetics of insect fibrillar flight muscle






Journal of Muscle Research & Cell Motility 4(3): 283-306

Role of magnesium atp in the contractile kinetics of insect fibrillar flight muscle

The changes in tension produced by small step or sinusoidal changes of length were measured for chemically skinned flight muscle fibers of the giant tropical water bug Lethocerus at MgATP concentrations in the range 0.1-10 mM. In the presence of Ca2+ concentrations of about 20 .mu.M, the rates of the rapid mechanical processes observed increased with increasing MgATP, exhibiting saturation with an apparent half-saturation constant lying between 0.1 and 1 mM MgATP, depending upon the conditions used. Under the same conditions, an increase in MgATP concentration led to a slight decrease in the isometric tension generated by the preparations. The results are discussed with reference to some current crossbridge models of muscle contraction.

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Accession: 006351659



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