A tale of two repressors.

A tale of two repressors.
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DOI:
10.1016/j.jmb.2011.02.023
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发表时间:
2011-05-27
影响因子:
5.6
通讯作者:
Lewis M
Lewis M
中科院分区:
生物学2区
文献类型:
--
作者:
Lewis M

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很少有蛋白质能够像 lac 阻遏蛋白和 λ 阻遏蛋白一样对分子生物学领域产生如此强烈的影响。在细菌中,乳糖利用所需的基因受到负调控; lac 阻遏物与上游操纵子结合,阻断乳糖利用所需酶的转录。类似的开关调节病毒的生命周期。 λ 阻遏物与操纵位点结合并阻断裂解发育所需的噬菌体基因的转录。雅各布和莫诺首次提出基因调控模型已有 50 年历史,该模型在当代教科书中基本没有改变。该模型有力地描述了一组基因如何协调转录以响应环境条件并调节细胞中的代谢事件。提出了一个历史视角,说明了这两种阻遏分子所发挥的作用以及它们对我们理解基因调控的贡献。
Few proteins have had such a strong impact on a field as the lac repressor and λ repressor have had in Molecular Biology In bacteria, the genes required for lactose utilization are negatively regulated; the lac repressor binds to an upstream operator blocking transcription of the enzymes necessary for lactose utilization. A similar switch regulates the virus life cycle; λ repressor binds to an operator site and blocks transcription of the phage genes necessary for lytic development. It is now 50 years since Jacob and Monod first proposed a model for gene regulation, which survives essentially unchanged in contemporary textbooks. This model provides a cogent depiction of how a set of genes can be coordinately transcribed in response to environmental conditions and regulates metabolic events in the cell. A historical perspective is presented that illustrates the role these two repressor molecules played and their contribution to our understanding of gene regulation.
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