One Is Not Enough
One Is Not Enough
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DOI：
10.1016/j.jmb.2009.07.050
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发表时间：
2009-10-09
影响因子：
5.6
通讯作者：
Lewis, Mitchell
中科院分区：
文献类型：
--
作者：
Daber, Robert;Sharp, Kim;Lewis, Mitchell
In both prokaryotic and eukaryotic organisms, repressors and activators are responsible for regulating gene expression. The lac operon is a paradigm for understanding how metabolites function as signaling molecules and modulate transcription. These metabolites or allosteric effector molecules bind to the repressor and alter the conformational equilibrium between the induced and the repressed states. Here, we describe a set of experiments where we modified a single inducer binding site in a dimeric repressor and examined its effect on induction. Based upon these observations, we have been able to calculate the thermodynamic parameters that are responsible for the allosteric properties that govern repressor function. Understanding how effector molecules alter the thermodynamic properties of the repressor is essential for establishing a detailed understanding of gene regulation. (C) 2009 Elsevier Ltd. All rights reserved.
