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Cellular Motility (Actin filaments (Assembly and structure of actin…

- - - - They then polymerize to form filaments
        
        Polymerisation is reversible
        
        filaments can depolymerize by dissociation of actin subunits, allowing actin filaments to be broken down when necessary.
        
        In the cell there is an equilibrium which exists between actin monomers and filaments. This is dependant on the concentration of free monomers, In the cell there is an excess of actin monomers
      - Has the appearence of a double helix as each monomer is rotated 166 degrees
    - - Actin monomers also bind ATP, which is hydrolyzed to ADP following filament assembly
      - ATP is not required for polymerization = but Actin monomers to which ATP is bound polymerize more readily than those which are ADP bound
- - - - Smallest 6 nm
      - Two protein chains loosely twinned together
      - Movements like contraction, crawling, pinching
    - - intermediate size 10nm
      - Very stable - usually not broken down
      - Strength and support
    - - Largest 25nm
      - dimers of a and b tublin subunits
      - facilitate movement of cell and materials within the cell
- - - - Z lines move towards each other resulting in a contraction