Homing endonuclease I-CreI derivatives with novel DNA target specificities.

Homing endonuclease I-CreI derivatives with novel DNA target specificities.
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DOI:
10.1093/nar/gkl645
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发表时间:
2006
影响因子:
14.9
通讯作者:
Seligman LM
Seligman LM
中科院分区:
生物学2区
文献类型:
--
作者:
Rosen LE;Morrison HA;Masri S;Brown MJ;Springstubb B;Sussman D;Stoddard BL;Seligman LM

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归巢核酸内切酶是高度特异性的酶,能够识别和切割复杂基因组中的独特DNA序列。由于此类DNA切割事件可导致体内靶向等位基因失活和/或等位基因置换,因此工程化与感兴趣的特定DNA序列匹配的归巢核酸内切酶的能力将能够实现强大且精确的基因组操作。我们已经采取了逐步遗传的方法在分析个人归巢核酸内切酶I-CreI蛋白/DNA接触,并在这里描述了新的相互作用在四个不同的靶位点的位置。两种突变核酸内切酶的晶体结构揭示了其改变的DNA靶特异性的分子相互作用。我们还结合了联合收割机新的接触,以创建具有预测的靶特异性的核酸内切酶。这些研究提供了重要的见解工程归巢核酸内切酶与新的目标特异性,以及到DNA识别的进化,这个迷人的蛋白质家族。
Homing endonucleases are highly specific enzymes, capable of recognizing and cleaving unique DNA sequences in complex genomes. Since such DNA cleavage events can result in targeted allele-inactivation and/or allele-replacement in vivo, the ability to engineer homing endonucleases matched to specific DNA sequences of interest would enable powerful and precise genome manipulations. We have taken a step-wise genetic approach in analyzing individual homing endonuclease I-CreI protein/DNA contacts, and describe here novel interactions at four distinct target site positions. Crystal structures of two mutant endonucleases reveal the molecular interactions responsible for their altered DNA target specificities. We also combine novel contacts to create an endonuclease with the predicted target specificity. These studies provide important insights into engineering homing endonucleases with novel target specificities, as well as into the evolution of DNA recognition by this fascinating family of proteins.
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发表时间: 2003-06-01
影响因子: 14.9
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