Molecular biology of cell locomotion - Actin and myosin: control of filament assembly

Actin filaments, assembled from highly purified actin from either skeletal muscle or Dictyostelium amoebae, are very stable under physiological ionic conditions. A small and limited amount of exchange of actin filament subunits for unpolymerized actin or subunits in other filaments has been measured...

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Bibliographic Details
Published in:Philosophical transactions of the Royal Society of London. Series B, Biological sciences Biological sciences, 1982-11, Vol.299 (1095), p.247-261
Main Authors: Spudich, J. A., Pardee, J. D., Simpson, P. A., Yamamoto, K., Kuczmarski, E. R., Stryer, L.
Format: Article
Language:English
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Summary:Actin filaments, assembled from highly purified actin from either skeletal muscle or Dictyostelium amoebae, are very stable under physiological ionic conditions. A small and limited amount of exchange of actin filament subunits for unpolymerized actin or subunits in other filaments has been measured by three techniques: fluorescence energy transfer, incorporation of 35S-labelled actin monomers into unlabelled actin filaments, and exchange of [14C]ATP with filament-bound ADP. A 40 kDa protein purified from amoebae destabilizes these otherwise stable filaments in a Ca2+ -dependent manner. Myosin purified from Dictyostelium amoebae is phosphorylated both in the tail region of the heavy chain and in one of the light chains. Phosphorylation appears to regulate myosin thick-filament formation.
ISSN:0080-4622
2054-0280
DOI:10.1098/rstb.1982.0130