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The Cytoskeleton
- PROTEIN FIBRES
- Micro/Actin filaments
- Made of F and G actin subunits
- Smallest of the protein fibres
- Involved in cell movement
- Each actin molecule has a
Mg ion binding site
- Requires lots of ATP to
make ADP +Pi formed
- Made of F and G actin subunits
- Micotubules
- Made from Alpha and Beta Tubulin fibres
- Largest of the protein fibres
- They involved in intracellular transport, cell division
- Motorway system to all areas of the cell
- Made from Alpha and Beta Tubulin fibres
- Intermediate Filament
- Middle Size
- Made of tetramers formed
of proteins
- Mechanical strength and structural support
- Rope like, across the whole cell
- Involved in cell-cell interaction
- Middle Size
- WHAT IS IT MADE OUT OF?
- Micro/Actin filaments
- WHAT ROLE DOES IT
HAVE?
- Gives the cell a mobile shape
- Allows the cell to move
- Intercellular transport
- Responsive to inter and extra celluar signals
- Gives the cell a mobile shape
- WHAT IS IT?
- A framework of proteins made up of three subunits
- Made from subunit proteins which
form polymers
- A framework of proteins made up of three subunits
- POLYMERISATION
- Nucleation (lag phase)
- Small sunits may form together to form oligomer
- Small sunits may form together to form oligomer
- Elongation (growth phase)
- Subunits only add on one side of the molecule (+) end
- Subunits only add on one side of the molecule (+) end
- Steady State (equilibrium phase)
- Where the rate of subunit addition and loss are equal
- Called the critical condition =Cc
- Called the critical condition =Cc
- Accessory proteins increases the speed of the process
- Where the rate of subunit addition and loss are equal
- Requires lots of ATP
- Nucleation (lag phase)
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