Biology 2382B Lecture Notes - Lecture 11: Cyclic Adenosine Monophosphate, Go Deep, Ras Superfamily

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Actin is corticol: found near the cortex (plasma membrane) Cortical function: cortex is near the outside. Actin is found underneath the plasma membrane: can still extend into the cell. Actin is corticol: supports the plasma membrane. Involved in cell shape and movement because it is in contact with plasma membrane: actin network forms structures that facilitates movement, cell that can move or muscle contraction. Responds to extracellular signals: receptors on the plasma membrane that change the cytoskeleton, response impacts the actin cytoskeleton changes dramatically to signals. Unlike tubulin (single rigid structure), actin can form networks and bundles: can be many shapes and give rise to many structures in the cell. Adherence belts: forms structures that help hold a cell"s shape. Processes involving movement of the cell membrane. Moving vesicles inside cell involves actin-related structure. Actin does more things than tubulin does: tubulin can only be linear (straight rod) where things move up and down.

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