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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >HSP90 and checkpoint-dependent lengthening of the G2 phase observed in plant cells under hypoxia and cold
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HSP90 and checkpoint-dependent lengthening of the G2 phase observed in plant cells under hypoxia and cold

机译：在缺氧和寒冷条件下在植物细胞中观察到HSP90和G2期的检查点依赖性延长

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摘要

Proliferating cells of Allium cepa L. roots became adapted to hypoxia (5% oxygen) and cold (10 degreesC) by acquiring new steady-state kinetics of growth. The cell cycle time increased from the 17.6 It in control meristems up to 29.7 and 69.0 h under hypoxia and cold conditions, respectively. Acclimation of the proliferating cells was stress specific. No acclimation took place after 24 It of heat treatment (40 degreesC). Under cold treatment. all cycle phases enlarged uniformly. However, under hypoxia, while the G, and S cycle phases roughly doubled in their timing, the expected checkpoint-dependent lengthening of G, did not take place. This failure in lengthening G, in response to hypoxia correlated with a failure in the over-induction of a single peptide with a molecular mass of about 134 kDa which is among those recognised by an HSP90 antibody. Moreover, the presence of this large peptide of the HSP90 family proved to be a marker for cell proliferation. It was always absent from the contiguous differentiated cells of the root. Lastly, the mitochondrial chaperonin recognized by an HSP60 antibody in these roots not involved in photosynthesis was always higher in the proliferating than in the nonproliferating cells.
机译：通过获取新的稳态生长动力学，葱属洋葱根的增殖细胞适应了低氧（5％氧气）和寒冷（10摄氏度）。在缺氧和寒冷条件下，细胞周期时间从对照分生组织中的17.6 It分别增加到29.7和69.0 h。增殖细胞的适应是应激特异性的。在24 It热处理（40°C）之后，没有发生驯化。在冷处理下。所有循环阶段均均匀扩大。但是，在缺氧情况下，虽然G和S周期阶段的时间大约加倍，但预期的依赖于检查点的G的延长并未发生。响应于缺氧而延长G的这种失败与分子量为约134kDa的单个肽的过度诱导的失败有关，所述单个肽是由HSP90抗体识别的那些。此外，HSP90家族这种大肽的存在被证明是细胞增殖的标志。根的连续分化细胞中总是缺少它。最后，在这些不参与光合作用的根中，由HSP60抗体识别的线粒体伴侣蛋白在增殖中总是比在非增殖细胞中更高。

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