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Reference: Neuber A, et al. (2008) Nuclear export receptor Xpo1/Crm1 is physically and functionally linked to the spindle pole body in budding yeast. Mol Cell Biol 28(17):5348-58

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Abstract


The spindle pole body (SPB) represents the microtubule organizing center in budding yeast. It is a highly structured organelle embedded in the nuclear membrane which is required to anchor microtubules (MTs) on both sides of the nuclear envelope. The protein Spc72, a component of the SPB, is located at the cytoplasmic face of this organelle and serves as a receptor for the gamma-tubulin complex. In this paper we show that it is also a binding partner of the nuclear export receptor Xpo1/Crm1. Xpo1 binds its cargoes in a Ran-dependent fashion via a short leucine-rich nuclear export signal (NES). We show that binding of Spc72 to Xpo1 depends on Ran-GTP and a functional NES in Spc72. Mutations in this NES have severe consequences for mitotic spindle morphology in vivo. This is also the case for xpo1 mutants, which show a reduction in cytoplasmic microtubules. In addition, we find a subpopulation of Xpo1 localized at the spindle pole body. Based on these data, we propose a functional link between Xpo1 and the SPB and discuss a role for this exportin in spindle biogenesis in budding yeast.

Reference Type
Journal Article
Authors
Neuber A, Franke J, Wittstruck A, Schlenstedt G, Sommer T, Stade K
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