Biology 2382B Study Guide - Final Guide: Myosin, Actin, Immunoglobulin Heavy Chain
Document Summary
Involved in cell shape, movement, and cortical function. Cortical function: cortex is the outer part of the cell plasma. Change its shape and movement in response to extracellular cues. Actin sits on the cell surface, supporting it. You are moving through from the inner cell to out via mt. Once you hit the plasma membrane you are handing it off to actin to finish the job. One of the main differences between actin and tubulin is that actin can form network and it can branch. Forms microvilli, stress fibers, can form complex meshworks of networks. Vertebrates isoforms - 4 alpha (muscle) beta and gamma. There are different types of actin, just like tubulin there are alpha, beta, and gamma actin. G-actin is translated and forms this characteristic shape that is called globular so it"s basically this ball shape. Little cleft/notch on the ball that is a atp-binding domain cleft.