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CytoSkeleton. By: John Mandziara. Made of. The cytoskeleton is made up of three kinds of filaments: 1. Actin Filaments (Micro) 2. Intermediate Filaments 3. Microtubules . The three parts:. Actin Filaments .

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cytoskeleton

CytoSkeleton

By: John Mandziara

made of
Made of
  • The cytoskeleton is made up of three kinds of filaments:

1. Actin Filaments (Micro)

2. Intermediate Filaments

3. Microtubules

actin filaments
Actin Filaments
  • Monomers of the protein actin polymerize to form long, thin fibers. These are about 8 nm in diameter and, being the thinnest of the cytoskeletal filaments, are also called microfilaments. In skeletal muscle fibers they are called thin filaments
  • What they do:

1. Provide strength

2. Start Motion

3. Interact with myosin (thick) for muscular contractions

intermediate filaments
Intermediate Filaments
  • These cytoplasmic fibers average 10 nm in diameter and thus are "intermediate" in size between actin filaments 8 nm and microtubules 25 nm as well as of the thick filaments of skeletal fibers
  • Types:

1. Keratins (Hair and Nails)

2. Lamins (Stabilize the inner membrane)

3.Nuerofilaments (Strengthen the long axons of neurons)

4. Vimentins (Provide mechanical strength to muscles)

microtubules
Microtubules
  • Straight, hollow cylinders whose wall is made up of a ring of 13 "protofilaments"; have a diameter of about 25 nm; are variable in length but can grow 1000 times as long as they are wide; are built by the assembly of dimers of alpha tubulin and beta tubulin; are found in both animal and plant cells.
  • Grow at each end by the polymerization of tubulindimers (powered by the hydrolysis of GTP), and shrink at each end by the release of tubulindimers (depolymerization).
  • Two major groups:

1. Kinesins (move toward positive end)

2. Dyneins (move toward negative end)

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