BIOL 2021 Chapter Notes - Chapter 16: Microtubule Nucleation, Coiled Coil, Intermediate Filament
Document Summary
Purpose: to move things in the cell, move the whole cell, provide strength and shape. Actin filaments determines shape of cell: creation of microvilli, movement of whole cell, always found right under the plasma membrane. Microtubules direct intracellular transport: helps determine organelle location, radiates outwards from the nucleus towards the membrane. Accessory proteins includes motor proteins (intracellular movement: the train in the cell. Plays a role in support because it"s right under the cell surface. Microtubules train tracks inside the cell to help vesicles move. Motor proteins only walk on microtubules and actin. Intestines in all eukaryotes have these three filaments just in different organization. 2 strand helical shape: strands are flexible and forms bundles just under the plasma membrane to help support structure (cell cortex) Small, single, globular protein: occurs in monomer form. Each actin subunit (aka each monomer) has a binding site: binds to atp.