Lecture 8 - BIOL104-04 Principles of Biology September 10,...

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BIOL104-04 Principles of Biology September 10, 2010 Lecture #8 Ch 4 Cytoskeleton Ch 5 Enzymes
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Intracellular transport • Lots of vesicles need to go different places • How do they get there? • Dynamic cytoskeleton – Actin filaments – Intermediate filaments – Microtubules
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Cytoskeleton • Extensive system of protein fibers • Shape • Structural stability • Moving the cell • Moving things within the cell
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Actin filaments Actin filaments = microfilaments Actin is most abundant protein Individual actin molecules polymerize to form actin filaments Actin monomer is assymetrical Filament has polarity – Plus end – Minus end – Polymerization occurs fastest at the plus end
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Actin filaments
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Intermediate filaments • Composed of different types of proteins • Not polar • Each filament is identical • Not involved in movement • Purely a structural role • Keratin in skin, fingernails, hair • Hold the nucleus in place
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 8 - BIOL104-04 Principles of Biology September 10,...

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