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Septin GTPases spatially guide microtubule organization and plus end dynamics in polarizing epithelia
Journal article   Open access   Peer reviewed

Septin GTPases spatially guide microtubule organization and plus end dynamics in polarizing epithelia

Jonathan R Bowen, Daniel Hwang, Xiaobo Bai, Dheeraj Roy and Elias T Spiliotis
The Journal of cell biology, v 194(2), pp 187-197
25 Jul 2011
DOI: https://doi.org/10.1083/jcb.201102076
PMID: 21788367
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https://doi.org/10.1083/jcb.201102076View
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Abstract

Establishment of epithelial polarity requires the reorganization of the microtubule (MT) cytoskeleton from a radial array into a network positioned along the apicobasal axis of the cell. Little is known about the mechanisms that spatially guide the remodeling of MTs during epithelial polarization. Septins are filamentous guanine triphosphatases (GTPases) that associate with MTs, but the function of septins in MT organization and dynamics is poorly understood. In this paper, we show that in polarizing epithelia, septins guide the directionality of MT plus end movement by suppressing MT catastrophe. By enabling persistent MT growth, two spatially distinct populations of septins, perinuclear and peripheral filaments, steer the growth and capture of MT plus ends. This navigation mechanism is essential for the maintenance of perinuclear MT bundles and for the orientation of peripheral MTs as well as for the apicobasal positioning of MTs. Our results suggest that septins provide the directional guidance cues necessary for polarizing the epithelial MT network.

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Cell Biology
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