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  • Title: Electron microscopic localization of myosin II and ABP-120 in the cortical actin matrix of Dictyostelium amoebae using IgG-gold conjugates.
    Author: Ogihara S, Carboni J, Condeelis J.
    Journal: Dev Genet; 1988; 9(4-5):505-20. PubMed ID: 3243031.
    Abstract:
    To narrow the field of possible functions of an actin-binding protein (ABP-120) and myosin II, we have used high resolution immunocytochemistry with IgG-colloidal gold conjugates to identify the types of actin containing structures with which these proteins are associated in the isolated cell cortex. Staining for myosin II and ABP-120 is associated with distinct regions of the actin cytoskeleton in isolated cortices. Myosin II is localized to lateral arrays of filaments, where it is clustered and has a density that is unrelated to distance from the plasma membrane. Staining for myosin II is associated also with unidentified cytoplasmic vesicles. However, staining for ABP-120 is concentrated in dense networks of branched microfilaments that are adjacent to the plasma membrane or in surface projections (residual pseudopods and lamellopods). These results are consistent with a role for ABP-120 in the formation of filament networks in vivo and further suggest that networks of branched microfilaments are unlikely to participate in motility that is mediated by myosin II.
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