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
影响因子:
1.7
通讯作者:
Saxena S
中科院分区:
文献类型:
--
作者:
Ji M;Tan L;Jen-Jacobson L;Saxena S
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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影响因子:
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Dylla-Spears, Rebecca;Townsend, Jacqueline E.;Sohn, Lydia L.;Jen-Jacobson, Linda;Muller, Susan J.
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BLUMBERG, WE
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LESSER, DR;KURPIEWSKI, MR;JENJACOBSON, L
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JENJACOBSON, L