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Paramyosin content and thick filament structure in insect muscles

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Summary

The myosin filaments of the flight muscles of the locust Locusta migratoria, the cockchafer Melolontha melolontha and the femur muscles of L. migratoria have solid centers. Those of the flight muscles of the housefly Musca domestica and Drosophila melanogaster are tubular. Electron micrographs of myofibrils of the fleshfly Phormia terrae-novae contain both filament types within one sarcomere and suggest the existence of 4 cross-bridges per crown.

Estimates of the ratios of myosin to paramyosin and of myosin to actin on sodium dodecyl sulphate-polyacrylamide gels yielded paramyosin contents of 9% of the thick filament mass for the solid and 2.6% for the tubular filaments (3.8% for P. terrae-novae). Based on the myosinactin ratios up to 6 myosin dimers per crown could be calculated.

The molar ratio of actin to arthrin on SDS gels was found to be 3.37 for native and extracted myofibrils of flight muscles from P. terrae-novae. Arthrin is also present in isolated actin filaments suggesting that it is localized in or on the thin filaments. If we assume that it is constituent part of the helices of the thin filaments the number of myosin dimers per crown can be diminished to 4.5, considerably closer to the values obtained by evaluation of electron micrographs.

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Dedicated to Prof. Dr. Bernhard Rensch on his 85th birthday

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Beinbrech, G., Meller, U. & Sasse, W. Paramyosin content and thick filament structure in insect muscles. Cell Tissue Res. 241, 607–614 (1985). https://doi.org/10.1007/BF00214582

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