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The Cytoskeleton

The Cytoskeleton. Network of Protein Filaments Used in: Structural Support Cell Movement Movement of Vesicles within Cells Composed of three types of Cytoskeletal fibers Actin Filaments Microtubules Intermediate Filaments. The Cytoskeleton. Actin Filaments

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The Cytoskeleton

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  1. The Cytoskeleton Network of Protein Filaments Used in: Structural Support Cell Movement Movement of Vesicles within Cells Composed of three types of Cytoskeletal fibers Actin Filaments Microtubules Intermediate Filaments

  2. The Cytoskeleton Actin Filaments Smallest of the fibers, 7nm in diameter Two protein chains, loosely twined Each subunit is the globular protein actin Polarity designates direction of growth Turn on polymerization when appropriate Responsible for cellular movements

  3. The Cytoskeleton Actin Filaments

  4. The Cytoskeleton Microtubules Ring-shaped tubes, 25nm in diameter Consist of 13 protofilaments, arranged side by side around a central core Facilitate cellular movement and move materials within the cell Form nucleation centers near center of cell + end of microtubule radiates away from nucleation center - end of microtubule radiates towards nucleation center

  5. The Cytoskeleton Microtubules

  6. The Cytoskeleton Intermediate Filaments Most durable of filaments Tough, fibrous protein molecules twined together in overlapping arrangement Stable Constitute mixed group of cytoskeletal fibers Vimentin (most common) Keratin (epithelial cells)

  7. The Cytoskeleton Intermediate Filaments

  8. The Cytoskeleton Microtubule Organizing Centers Centrioles Centrosome Pericentriolar Material

  9. The Cytoskeleton Centrioles Barrel-shaped organelles Found in cells of animals and protists Occur in pairs Located in right angles to each other outside the nuclear membranes

  10. The Cytoskeleton Centrosome Region surrounding centrioles Responsible for reorganization of microtubules that occurs during cell division Centrosomes of plants and fungi lack centrioles

  11. The Cytoskeleton

  12. The Cytoskeleton Pericentriolar Material Contains ring-shaped structures composed of tubulin Nucleates the assembly of microtubules in animal cells Called microtubule-organizing centers

  13. The Cytoskeleton Pericentriolar Material

  14. The Cytoskeleton Movement of Materials within Cells Use of Actin Filaments in cells allows for movement Cytoskeleton provides scaffold that holds certain enzymes and other macromolecules in defined areas of cytoplasm By moving and anchoring particular enzymes near one another, responsible for organizing cell's activities

  15. The Cytoskeleton Molecular Motors A vesicle or organelle needs to be transported A motor protein that provies the energy-driven motion A connector molecule that connects the vesicle to the motor molecule Microtubules on which the vesicle will ride like a train on a rail

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