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Author(s): Efimov, Andrey
Kharitonov, Alexey
Efimova, Nadia
Loncarek, Jadranka
Miller, Paul M
Andreyeva, Natalia
Gleeson, Paul
Galjart, Niels
Maia, Ana R R
McLeod, Ian X
Yates, John R
Khodjakov, Alexey
Maiato, H
Akhmanova, Anna
Kaverina, Irina
Title: Asymmetric CLASP-dependent nucleation of noncentrosomal microtubules at the trans-Golgi network.
Alternative title: CLASP-dependent microtubule nucleation at the TGN
Issue Date: 2007
Abstract: Proper organization of microtubule arrays is essential for intracellular trafficking and cell motility. It is generally assumed that most if not all microtubules in vertebrate somatic cells are formed by the centrosome. Here we demonstrate that a large number of microtubules in untreated human cells originate from the Golgi apparatus in a centrosome-independent manner. Both centrosomal and Golgi-emanating microtubules need γ-tubulin for nucleation. Additionally, formation of microtubules at the Golgi requires CLASPs, microtubule-binding proteins that selectively coat non-centrosomal microtubule seeds. We show that CLASPs are recruited to trans-Golgi network (TGN) at the Golgi periphery by the TGN protein GCC185. In sharp contrast to radial centrosomal arrays, microtubules nucleated at the peripheral Golgi compartment are preferentially oriented toward the leading edge in motile cells. We propose that Golgi–emanating microtubules contribute to the asymmetric microtubule networks in polarized cells and support diverse processes including post-Golgi transport to the cell front.
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Source: Developmental cell, vol. 12(6), p. 917-930
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
Appears in Collections:I3S - Artigo em Revista Científica Internacional

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