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Microtubule nucleation: gamma-tubulin and beyond Wiese C; Zheng YJ Cell Sci 2006[Oct]; 119 (Pt 20): 4143-53Centrosomes and their fungal equivalents, spindle pole bodies (SPBs), are the main microtubule (MT)-organizing centers in eukaryotic cells. Several proteins have been implicated in microtubule formation by centrosomes and SPBs, including microtubule-minus-end-binding proteins and proteins that bind along the length or stabilize the plus ends of microtubules. Recent work has improved our understanding of the molecular mechanisms of MT formation. In particular, it has shown that gamma-tubulin and its associated proteins play key roles in microtubule nucleation and spindle assembly in evolutionarily distant species ranging from fungi to mammals. Other work indicates that gamma-tubulin-mediated microtubule nucleation, although necessary, is not sufficient for mitotic spindle assembly but requires additional proteins that regulate microtubule nucleation independently of centrosomes.|Animals[MESH]|Cell Cycle/physiology[MESH]|Humans[MESH]|Microtubule-Associated Proteins/metabolism[MESH]|Microtubule-Organizing Center/metabolism[MESH]|Microtubules/*metabolism[MESH]|Models, Biological[MESH]|Spindle Apparatus/metabolism[MESH]|Tubulin/*metabolism[MESH] |
