Cytochalasin D inhibits the formation of microfilaments. Which of the following biological activities will not be hindered ?
Cytosolic transport of vesicles
Cytochalasin D is a fungal toxin that caps the fast-growing (barbed, plus) ends of actin filaments, blocking addition of new actin subunits and so preventing microfilament assembly and turnover.
Long-distance transport of vesicles through the cytosol runs mainly on microtubules, driven by the motor proteins kinesin and dynein. Since microtubules are built from tubulin, not actin, this transport continues in the presence of cytochalasin D.
Amoeboid movement and phagocytosis depend on continuous actin polymerization at the leading edge to form pseudopodia, so they are blocked.
Cytokinesis in animal cells requires a contractile ring of actin and myosin II that forms the cleavage furrow, so it is blocked; and contraction in muscle relies on actin thin filaments sliding over myosin, an actin-based process classed as microfilament dependent.
Hence, Cytosolic transport of vesicles.
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