Effect of Skeletal Muscle Native Tropomyosin on the Interaction of Amoeba Actin with Heavy Meromyosin View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1970-12

AUTHORS

EVAN EISENBERG, ROBERT R. WEIHING

ABSTRACT

ACTIN and myosin, recently identified in protozoa and myxomycetes, are presumably responsible for the motility of these organisms1–5. Control of this motility is, however, not at all understood. In skeletal muscle, contraction is partly under the control of the protein complex, native tropomyosin which is believed to bind to the actin filaments6,7. In the presence of Ca2+, native tropomyosin allows the interaction of actin and myosin filaments to occur wiiereas in the absence of Ca2+ native tropomyosin inhibits this interaction6, probably by inhibiting the binding of actin to myosin8. No protein like native tropomyosin has yet been identified in a primitive contractile system, but we know that Acanthamoeba actin activates the ATPase of skeletal muscle heavy meromyosin (HMM) and we have used this fact to investigate the effect of skeletal muscle native tropomyosin on the interaction of Acanthamoeba actin with HMM. We have found that native tropomyosin in the presence of Ca2+ increases the activation of HMM ATPase by Acanthamoeba actin, while in the absence of Ca2+ the native tropomyosin inhibits this activation. More... »

PAGES

1092-1093

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/2281092a0

DOI

http://dx.doi.org/10.1038/2281092a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018343323

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/4249428


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