CellBio3 - The eukaryotic cytoskeleton. Actin flaments are...

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Unformatted text preview: The eukaryotic cytoskeleton. Actin flaments are shown in red , microtubules in green , and the nuclei are in blue . The Cytoskeleton A Network of Skeletal Fibers that is Constantly Changing its Shape Functions: Cell Structure and Movement Intracellular Transport Cell Division The Cytoskeleton A Network of Skeletal Fibers that is Constantly Changing its Shape Functions: Cell Structure and Movement The three main kinds of ¡bers are: • Actin ¡laments (7 nm diameter) Made of the protein, actin The Cytoskeleton A Network of Skeletal Fibers that is Constantly Changing its Shape Functions: Cell Structure and Movement The three main kinds of ¡bers are: • Actin ¡laments (7 nm diameter) • Microtubules (25 nm diameter) Made of tubulin The Cytoskeleton A Network of Skeletal Fibers that is Constantly Changing its Shape Functions: Cell Structure and Movement The three main kinds of ¡bers are: • Actin ¡laments (7 nm diameter) • Microtubules (25 nm diameter) • Intermediate ¡laments (10 nm diameter) Made of many different proteins Watch crawling Amoeba Movie http://www.youtube.com/watch?v=uzIicueUaq0 Figure 4.19 Showing Cause and Effect in Biology Actin Filaments (Microflaments) • The flaments look like 2 intertwined chains o¡ beads • Occurs in bundles o¡ many actin flaments and in complex networks Actin Filaments Some Important Properties of Actin Filaments • They polymerize (self assemble) by noncovalent, reversible, addition of actin monomers at the ends of the ¡laments- are highly dynamic A fundamental capability of biological molecules is the ability to self-assemble Some Important Properties of Actin Filaments • They polymerize (self assemble) by noncovalent, reversible, addition of actin monomers at the ends of the ¡laments • ATP is hydrolyzed, causing a special type of dynamic activity called treadmilling (assembly at one end of the ¡lament and disassembly at the opposite end----the ¡laments are polar) Actin polymerization...
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This note was uploaded on 10/16/2010 for the course MCDB MCDB 1A taught by Professor Senghuilow during the Spring '09 term at UCSB.

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CellBio3 - The eukaryotic cytoskeleton. Actin flaments are...

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