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
中科院分区:
文献类型:
--
作者:
Carr CE;Foster AW;Maroney MJ
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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影响因子:
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作者:
Foster AW;Pernil R;Patterson CJ;Scott AJP;Pålsson LO;Pal R;Cummins I;Chivers PT;Pohl E;Robinson NJ
通讯作者:
Robinson NJ
影响因子:
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SOLOMON, EI
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通讯作者:
MASCHARAK, PK
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通讯作者:
Hodgson, KO
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15
作者:
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通讯作者:
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