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          Institute: MPI für molekulare Zellbiologie und Genetik     Collection: Publikationen MPI-CBG 2008     Display Documents



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ID: 414365.0, MPI für molekulare Zellbiologie und Genetik / Publikationen MPI-CBG 2008
Augmin: a protein complex required for centrosome-independent microtubule generation within the spindle
Authors:Goshima, Gohta; Mayer, Mirjam; Zhang, Nan; Stuurman, Nico; Vale, Ronald D
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Journal of Cell Biology
Volume:181
Issue / Number:3
Start Page:421
End Page:429
Copyright:not available
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Since the discovery of gamma-tubulin, attention has focused on its involvement as a microtubule nucleator at the centrosome. However, mislocalization of gamma-tubulin away from the centrosome does not inhibit mitotic spindle formation in Drosophila melanogaster, suggesting that a critical function for gamma-tubulin might reside elsewhere. A previous RNA interference (RNAi) screen identified five genes (Dgt2-6) required for localizing gamma-tubulin to spindle microtubules. We show that the Dgt proteins interact, forming a stable complex. We find that spindle microtubule generation is substantially reduced after knockdown of each Dgt protein by RNAi. Thus, the Dgt complex that we name "augmin" functions to increase microtubule number. Reduced spindle microtubule generation after augmin RNAi, particularly in the absence of functional centrosomes, has dramatic consequences on mitotic spindle formation and function, leading to reduced kinetochore fiber formation, chromosome misalignment, and spindle bipolarity defects. We also identify a functional human homologue of Dgt6. Our results suggest that an important mitotic function for gamma-tubulin may lie within the spindle, where augmin and gamma-tubulin function cooperatively to amplify the number of microtubules.
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:n.n.
Affiliations:MPI f�r molekulare Zellbiologie und Genetik
Identifiers:LOCALID:1103
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