Drosophila tubulin-binding cofactor B is required for microtubule network formation and for cell polarity.

Abstract:

:Microtubules (MTs) are essential for cell division, shape, intracellular transport, and polarity. MT stability is regulated by many factors, including MT-associated proteins and proteins controlling the amount of free tubulin heterodimers available for polymerization. Tubulin-binding cofactors are potential key regulators of free tubulin concentration, since they are required for α-β-tubulin dimerization in vitro. In this paper, we show that mutation of the Drosophila tubulin-binding cofactor B (dTBCB) affects the levels of both α- and β-tubulins and dramatically destabilizes the MT network in different fly tissues. However, we find that dTBCB is dispensable for the early MT-dependent steps of oogenesis, including cell division, and that dTBCB is not required for mitosis in several tissues. In striking contrast, the absence of dTBCB during later stages of oogenesis causes major defects in cell polarity. We show that dTBCB is required for the polarized localization of the axis-determining mRNAs within the oocyte and for the apico-basal polarity of the surrounding follicle cells. These results establish a developmental function for the dTBCB gene that is essential for viability and MT-dependent cell polarity, but not cell division.

journal_name

Mol Biol Cell

authors

Baffet AD,Benoit B,Januschke J,Audo J,Gourhand V,Roth S,Guichet A

doi

10.1091/mbc.E11-07-0633

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

3591-601

issue

18

eissn

1059-1524

issn

1939-4586

pii

mbc.E11-07-0633

journal_volume

23

pub_type

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