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Kingdom of Saudi Arabia Ministry of Education Al-Imam Mohammed Ibn Saud Islamic University College of Science - Biology Department |
| المـمـلـكـة الـعـــربية السعـوديـــة وزارة التعلـيـم جـــامـعــة الإمـــام محـمـد بن سعــود الإسـلاميـة كـلـيـة الــعـلــوم - قسم الاحياء |
P2
|
Property |
Microtubules (Tubulin polymers) |
Microfilaments (Actin Filaments) |
Intermediate Filaments |
|
Structure |
hollow tubes, wall consist of 13 columns of tublin molecules
|
two intertwined strands of actin, each a polymer of actin subunits |
fibrous proteins supercoiled into thicker cables |
|
Diameter |
25 nm with 15-nm lumen |
7 nm |
8-12 nm |
|
Protein Subunits |
tublin, a dimer consisting of a-tubling and b-tublin
|
actin |
one of several different proteins of the keratin family, depending on cell type |
|
Main Functions |
maintenance of cell shape (compression-resisting ' girders' ) cell motility ( as in cilia or flagella ) chromosome movemoent in cell division organelle movement
|
maintenance of cell shape ( tension-bearing elemnts ) changes in cell shape muscle contaction cytoplasmic streaming cell motility ( as in pseudopida ) cell division ( cleavage furrow formation ) |
maintenance of cell shape ( tension-bearing elemnts ) anchorage of nucleus and certain other oraganelles formation of nuclear lamina |
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