Bud3 activates Cdc42 to establish a proper growth site in budding yeast.

Bud3 activates Cdc42 to establish a proper growth site in budding yeast.
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Bud3激活CDC42以在萌芽的酵母中建立适当的生长位点。

DOI:
10.1083/jcb.201402040
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发表时间:
2014-07-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Park HO
Park HO
中科院分区:
其他
文献类型:
--
作者:
Kang PJ;Lee ME;Park HO

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在酵母细胞周期的G1期,由Bud3和CDc24两相激活CDC42是组装合适的芽位所必需的。细胞极化发生在通常由空间线索决定的单一轴上,但其潜在的机制却鲜为人知。使用生化分析和活细胞成像,我们证明了细胞极化到适当的生长位置需要在单倍体萌芽酵母中由Bud3激活CDC42。Bud3催化从Cdc42释放鸟苷二磷酸(GDP),并提高无活性CDC24细胞内的Cdc42-鸟苷三磷酸(GTP)水平,到目前为止,这是唯一的CDc42的GDP-GTP交换因子。在G1期,CDC42被激活分两个时间步骤:第一步依赖于Bud3,而随后的激活依赖于Cdc24。突变分析表明,G1中的CDC42的两相激活是组装合适的芽位所必需的。CDC42或Rac GTP酶的双相激活可能是真核生物空间线索导向的细胞极化的一般机制。
Biphasic activation of Cdc42 by Bud3 and then Cdc24 during G1 of the yeast cell cycle is necessary for assembly of a proper bud site. Cell polarization occurs along a single axis that is generally determined by a spatial cue, yet the underlying mechanism is poorly understood. Using biochemical assays and live-cell imaging, we show that cell polarization to a proper growth site requires activation of Cdc42 by Bud3 in haploid budding yeast. Bud3 catalyzes the release of guanosine diphosphate (GDP) from Cdc42 and elevates intracellular Cdc42–guanosine triphosphate (GTP) levels in cells with inactive Cdc24, which has as of yet been the sole GDP–GTP exchange factor for Cdc42. Cdc42 is activated in two temporal steps in the G1 phase: the first depends on Bud3, whereas subsequent activation depends on Cdc24. Mutational analyses suggest that biphasic activation of Cdc42 in G1 is necessary for assembly of a proper bud site. Biphasic activation of Cdc42 or Rac GTPases may be a general mechanism for spatial cue–directed cell polarization in eukaryotes.
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