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Biophysical Journal 12: 1405-1414 (1972)
© 1972 the Biophysical Society

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An X-Ray Diffraction Study of Contracting Molluscan Smooth Muscle

B. M. Millman and G. F. Elliott

ABSTRACT

The living anterior byssus retractor muscle of Mytilus (ABRM), a smooth, "catch" muscle, has been studied by X-ray diffraction while relaxed and while tonically contracted. X-ray reflections were observed from the actin and paramyosin filaments and from the {alpha}-helical substructure of the paramyosin filaments. No differences in spacings or relative intensities were observed when the relaxed and contracting muscle patterns were compared. This result is consistent with a sliding filament mechanism involving an interaction between actin and paramyosin filaments.






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Copyright © 1972 by the Biophysical Society.