与DNA结合的GCC盒结合域的溶液结构揭示了β-折叠对DNA的一种新型识别模式。
A novel mode of DNA recognition by a beta-sheet revealed by the solution structure of the GCC-box binding domain in complex with DNA.
作者信息
Allen M D, Yamasaki K, Ohme-Takagi M, Tateno M, Suzuki M
机构信息
AIST-NIBHT Plant Molecular Biology Laboratory, Higashi 1-1, Tsukuba 305-0046, Japan.
出版信息
EMBO J. 1998 Sep 15;17(18):5484-96. doi: 10.1093/emboj/17.18.5484.
Abstract
The 3D solution structure of the GCC-box binding domain of a protein from Arabidopsis thaliana in complex with its target DNA fragment has been determined by heteronuclear multidimensional NMR in combination with simulated annealing and restrained molecular dynamic calculation. The domain consists of a three-stranded anti-parallel beta-sheet and an alpha-helix packed approximately parallel to the beta-sheet. Arginine and tryptophan residues in the beta-sheet are identified to contact eight of the nine consecutive base pairs in the major groove, and at the same time bind to the sugar phosphate backbones. The target DNA bends slightly at the central CG step, thereby allowing the DNA to follow the curvature of the beta-sheet.
摘要
通过异核多维核磁共振结合模拟退火和受限分子动力学计算，已确定了拟南芥一种蛋白质的GCC盒结合结构域与其靶DNA片段复合物的三维溶液结构。该结构域由一个三链反平行β折叠和一个与β折叠大致平行堆积的α螺旋组成。β折叠中的精氨酸和色氨酸残基被确定与大沟中九个连续碱基对中的八个接触，同时与磷酸核糖骨架结合。靶DNA在中央CG步处轻微弯曲，从而使DNA能够跟随β折叠的曲率。
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