Biology Lecture 12 - TheCytoskeleton TheCytoskeleton

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The Cytoskeleton
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The Cytoskeleton A network of fibers extending throughout the cytoplasm that organizes the structures and activities of the cell
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The Cytoskeleton: Functions Supports cell and maintains shape Motility Regulation of biochemical activities
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The Cytoskeleton: Structure microtubule microfilament intermediate filament
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Motor proteins ATP- dependent movement Microtubules: kinesin and dynein Microfilaments: myosin
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Microtubules
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Thickest Long, hollow cylinders Straight and rigid Made from the protein tubulin Microtubules: Structure
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Microtubules: Structure β α Weak noncovalent bonds
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Microtubule-Organizing Center Centrosome Microtubule Centrioles 0.25 µm Longitudinal section of one centriole Microtubules Cross section of the other centriole MTOC Centrosome Animal cells Pair of centrioles Built from 9 triplets of microtubules Matrix
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Microtubules: Functions Shape the cell Guide the movement of organelles and vesicles (railroad tracks) Separate chromosomes during mitosis Make up structure of cilia and flagella to be able to move the entire cell
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Microtubules: Vesicle Movement Vesicle ATP Receptor for motor protein Motor protein (ATP powered) Microtubule of cytoskeleton Microtubule Vesicles 0.25 µm
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Microtubules: Cell Division
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Cilia and Flagella Locomotor appendages of some eukaryotic
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This note was uploaded on 10/14/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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Biology Lecture 12 - TheCytoskeleton TheCytoskeleton

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