Insights into copper coordination in the EcoRI-DNA complex by ESR spectroscopy.

Insights into copper coordination in the EcoRI-DNA complex by ESR spectroscopy.
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DOI:
10.1080/00268976.2014.934313
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发表时间:
2014-12-01
期刊:
影响因子:
1.7
通讯作者:
Saxena S
Saxena S
中科院分区:
化学4区
文献类型:
--
作者:
Ji M;Tan L;Jen-Jacobson L;Saxena S

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EcoRI限制性内切酶需要在两个对称且相同的催化位点各有一个二价金属离子来催化双链DNA切割。最近,我们发现Cu2+在催化位点外结合到每个亚基的H114上的一对新位点,并抑制Mg2+催化的DNA切割。为了提供这个新的金属离子结合位点更详细的结构信息,我们对EcoRI-DNA - (Cu2+)2配合物进行了w波段(~94 GHz)和x波段(~9.5 GHz)电子自旋共振光谱测量。Cu2+结合产生两种不同的组分,具有不同的gzz和Azz值。x波段电子自旋回波包络调制结果表明,这两种成分都是由Cu2+配位组氨酸引起的。超精细亚能级相关结果进一步证实了这一观察结果。w波段电子核双共振谱为水分子与Cu2+离子的赤道配位提供了证据。
The EcoRI restriction endonuclease requires one divalent metal ion in each of two symmetrical and identical catalytic sites to catalyse double-strand DNA cleavage. Recently, we showed that Cu2+ binds outside the catalytic sites to a pair of new sites at H114 in each sub-unit, and inhibits Mg2+ -catalysed DNA cleavage. In order to provide more detailed structural information on this new metal ion binding site, we performed W-band (~94 GHz) and X-band (~9.5 GHz) electron spin resonance spectroscopic measurements on the EcoRI–DNA–(Cu2+ )2 complex. Cu2+ binding results in two distinct components with different gzz and Azz values. X-band electron spin echo envelope modulation results indicate that both components arise from a Cu2+ coordinated to histidine. This observation is further confirmed by the hyperfine sub-level correlation results. W-band electron nuclear double resonance spectra provide evidence for equatorial coordination of water molecules to the Cu2+ ions.
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