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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >CYCLIN-DEPENDENT KINASE-LIKE PROTEINS IN PEA NUCLEI - THEIR PRESENCE AND ROLE IN CELL PROLIFERATION
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CYCLIN-DEPENDENT KINASE-LIKE PROTEINS IN PEA NUCLEI - THEIR PRESENCE AND ROLE IN CELL PROLIFERATION

机译:豌豆核细胞周期依赖性蛋白激酶蛋白的表达及其在细胞增殖中的作用

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Although many putative cdk (cyclin-dependent kinase) homologue genes have been identified in higher plants, their function and involvement in cell proliferation are still unclear. In this work we investigated the presence and distribution of cdk-like proteins in root tip meristem nuclei at different germination times (before, during, and after the onset of cell proliferation) and in nuclei of differentiated leaves. Nuclear cdk-like proteins were found in the root meristem throughout seed germination with a higher amount in actively proliferating cells, but were not detected in differentiated leaf. Characterization of the detected pea cdk-like proteins by immunoblotting led to the identification of two specific principal proteins of 33.2 and 34 kDa with the cdk conserved motif PSTAIRE. The p33.2 protein was also recognized by the anti-human p33(cdk2) antibody, suggesting that the p33.2 and p34 proteins could be pea homologues of human p33(cdk2) and p34(cdk1), involved in the G(1)-S and G(2)-M transitions, respectively. Additional analysis of pea cdk protein localization has shown partial localization of these proteins at DNA replication sites during the G(1) to S transition. These microscopical and biochemical data support the hypothesis that, in pea nuclei as in mammals, many PSTAIRE-cdks are present with different functions related to cell proliferation, one of which is probably involved in the control of the G(1)-S transition. [References: 21]
机译:尽管已在高等植物中鉴定出许多推定的cdk(细胞周期蛋白依赖性激酶)同源基因,但其功能和参与细胞增殖的作用仍不清楚。在这项工作中,我们研究了在不同萌发时间(细胞增殖开始之前,期间和之后)和分化叶片的核中,尖尖分生组织核中cdk样蛋白的存在和分布。在整个种子萌发过程中,在根分生组织中发现了核CDK样蛋白,在活跃增殖的细胞中含量较高,但在分化的叶中未检测到。通过免疫印迹对检测到的豌豆cdk样蛋白进行表征,鉴定出了两个特定的33.2和34 kDa的主要蛋白,具有cdk保守基序PSTAIRE。 p33.2蛋白也被抗人p33(cdk2)抗体识别,表明p33.2和p34蛋白可能是人p33(cdk2)和p34(cdk1)的豌豆同源物,参与了G(1) )-S和G(2)-M跃迁。豌豆cdk蛋白质定位的其他分析显示,在G(1)到S的过渡过程中,这些蛋白质在DNA复制位点的部分定位。这些微观和生化数据支持这样的假设:在豌豆核中,在哺乳动物中,存在许多PSTAIRE-cdks,它们具有与细胞增殖相关的不同功能,其中之一可能参与了G(1)-S过渡的控制。 [参考:21]

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