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Bio Lecture 4 Cytoskeleton

Bio Lecture 4 Cytoskeleton - Lecture 4 Cytoskeleton...

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Lecture 4: Cytoskeleton, mitochondria, chloroplasts Friday 10-2-09 Bio 93, Fall 2009 Reading: Ch 6, Pgs. 109-118
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Cytoskeleton in eukaryotic cells A network of fibers, extending throughout cytoplasm Structural support -mechanical support -anchors internal cellular components Motility Movement of cell from place to place Movement within the cell Structural elements of the cytoskeleton Microfilaments (MF), microtubules (MT), intermediate filaments (IF)
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Cytoskeletal elements Composed of subunits (polymers composed by monomers) polymer: a long molecule composed of identical subunits (or monomers) linked together Polarized (MicroTubules and MicroFilaments) + end, and – end Dynamic structures . rapid assembly and disassemly (MF and MT) -The actin network is involved in pseudopodia
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EM of cellular cytoskeleton after detergent extrac
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Microfilaments (actin): Location -Cortex, cytoplasmic mesh Structure -solid rods of 7nm diameter -twisted double chain of actin subunits Assembly-disassembly -subunits added at one end + -Subunit subtracted at other end -
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