A two-filament system and interaction of heavy meromyosin (HMM) with thin filaments in smooth muscle |
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| Authors: | Berit I Kristensen Lis Engdahl Nielsen Jørgen Rostgaard |
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| Institution: | (1) Zoophysiological Laboratory B, August Krogh Institute, University of Copenhagen, Denmark;(2) Anatomy Department C, University of Copenhagen, Denmark |
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| Abstract: | Summary The structure of glycerinated smooth muscle from small intestine of adult rat was investigated by electron microscopy. In the central parts of the tissue blocks a two-filament system was found, consisting of parallel thick and thin filaments with regularly spaced interconnections, closely resembling that of striated muscle. In the peripheral parts of the blocks only thin filaments were found. The thin filaments were identified as actin by the formation of arrowhead complexes after incubation with heavy meromyosin.This work was supported by grants from the Danish State Research Foundation and the Tuborg Foundation to J. Rostgaard. |
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| Keywords: | Smooth muscle Two-filament system Small intestine Rat |
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