An XAS investigation of the nickel site structure in the transcriptional regulator InrS.

An XAS investigation of the nickel site structure in the transcriptional regulator InrS.
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DOI:
10.1016/j.jinorgbio.2017.08.003
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发表时间:
2017-12
影响因子:
3.9
通讯作者:
Maroney MJ
Maroney MJ
中科院分区:
生物学2区
文献类型:
--
作者:
Carr CE;Foster AW;Maroney MJ

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InrS(Internal nickel-responsive Sensor)是镍输出蛋白NrsD的转录抑制因子,在结合镍离子后解除对输出蛋白表达的抑制。虽然已经报道了apo-InrS的晶体结构,但没有与金属离子结合的蛋白质结构可用。在这里,我们报告的结果的金属位点的结构调查的Ni(II)和Cu(II)配合物的InrS使用X-射线吸收光谱(XAS)是互补的数据可从apo-InrS晶体结构,并与平面四坐标[Ni(His)2(Cys)2]结构,其中的配体是来自侧链的His 21,Cys 53,His 78,和Cys 82是一致的。Cu(II)与InrS的配位形成了几乎相同的平面四配位复合物,这与Ni(II)中心被Cu(II)简单取代一致。InrS(Internal Nickel-Responsive Sensor)是一种镍响应性转录抑制因子。我们报告的金属网站的结构调查的Ni(II)和Cu(II)配合物的InrS使用X射线吸收光谱(XAS),是互补的数据可从apo-InrS晶体结构,并与平面四坐标[M(His)2(Cys)2]金属结合位点。
InrS (Internal nickel-responsive Sensor) is a transcriptional repressor of the nickel exporter NrsD and de-represses expression of the exporter upon binding Ni(II) ions. Although a crystal structure of apo-InrS has been reported, no structure of the protein with metal ions bound is available. Herein we report the results of metal site structural investigations of Ni(II) and Cu(II) complexes of InrS using x-ray absorption spectroscopy (XAS) that are complementary to data available from the apo-InrS crystal structure, and are consistent with a planar four-coordinate [Ni(His)2(Cys)2] structure, where the ligands are derived from the side chains of His21, Cys53, His78, and Cys82. Coordination of Cu(II) to InrS forms a nearly identical planar four-coordinate complex that is consistent with a simple replacement of the Ni(II) center by Cu(II). InrS (Internal Nickel-Responsive Sensor) is a nickel-responsive transcriptional repressor. We report metal site structural investigations of Ni(II) and Cu(II) complexes of InrS using x-ray absorption spectroscopy (XAS) that are complementary to data available from the apo-InrS crystal structure, and are consistent with a planar four-coordinate [M(His)2(Cys)2] metal binding site.
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