Abstract
Microtubules (MTs) are hollow cytoplasmic fibers that are composed of a dimeric protein called tubulin, as well as several MT-associated proteins (MAPS) bound along their surface. MTs are believed to play important roles in a variety of cellular processes, including mitosis, cell motility, and intracellular vesicle transport. Both in vitro and in vivo, individual MTs are dynamic; that is, they undergo alternating periods of polymerization and depolymerization from their ends, a process known as dynamic instability. The dynamic behavior of MTs is thought to play an important role both in cell cycle events and in cell differentiation. MAPS have been postulated to function as in vivo regulators of the dynamics and functions of MTs. Based on in vitro studies, several MAPS have been classified as
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