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Unrestraining Genetic Processes with a Protein-DNA Hinge

机译:蛋白质-DNA铰链的无限制遗传过程

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摘要

Genetic processes require direct interactions between proteins bound at nonadjacent cis elements. Because duplex DNA is rigid, either the protein-protein interactions are strong enough to deform the double helix or some feature of the intervening DNA must encourage juxtaposition of separated sites. For example, bent DNA can bring together only certain precisely positioned cis elements with the same helical phase. Interposing a DNA segment that both bends and twists easily to create a universal joint would provide an even more general mechanism to promote the association of separated sites regardless of position. A cis element of the human c-myc gene, known to be melted in vivo, and its associated single-strand DNA binding protein were examined and found to comprise just such a protein-DNA hinge.
机译:遗传过程需要结合在不相邻的顺式元件上的蛋白质之间的直接相互作用。因为双链体DNA是刚性的,所以蛋白质与蛋白质之间的相互作用足够强到足以使双螺旋变形的程度,或者中间DNA的某些特征必须促进分离位点的并置。例如,弯曲的DNA只能将具有相同螺旋相位的某些精确定位的顺式元件聚集在一起。插入容易弯曲和扭曲的DNA片段以形成通用接头,将提供更通用的机制来促进分离位点的缔合,而与位置无关。研究了已知在体内融化的人c-myc基因的顺式元件及其相关的单链DNA结合蛋白,发现其仅包含这种蛋白-DNA铰链。

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