BIOL 103 Lecture Notes - Lecture 6: Santa Barbara City College, Intermediate Filament, Lamin
Document Summary
Comprises of all the filamentous proteins that provide shape and support for the cell. Cell types lacking cytoskeleton have been shown to still have proteins that fulfill the same roles as the cytoskeleton: actin filaments (f-actin), microfilaments. Smallest of the 3 types of filaments (-7nm in diameter) Made of repeating subunits called actin (g-actin for differentiation b/w filament) Undergo dynamic instability using atp as its energy source. In animal cells: cellular locomotion, cellular adhesion and shape, cytokinesis, cargo trafficking, and muscle contraction. Remain close to the plasma membrane (cortical arrangement) Plant cells: actin found throughout the cytoplasm and more heavily involved in cargo trafficking and cell shape and cytoplasmic streaming: microtubules. Largest of the 3 types (-25nm in diameter) Made of repeating subunits called tubulin made up of 2 smaller subunits called alpha and beta tubulin. Undergoes dynamic instability using gtp as its energy source.