Mobility of Histidine Side Chains Analyzed with 15N NMR Relaxation and Cross-Correlation Data: Insight into Zinc-Finger-DNA Interactions.
Mobility of Histidine Side Chains Analyzed with 15N NMR Relaxation and Cross-Correlation Data: Insight into Zinc-Finger-DNA Interactions.
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使用 15N NMR 弛豫和互相关数据分析组氨酸侧链的迁移率:深入了解锌指-DNA 相互作用。
DOI:
10.1021/acs.jpcb.9b03132
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Iwahara,Junji
中科院分区:
文献类型:
--
作者:
Kemme,CatherineA;Luu,RossH;Chen,Chuanying;Pletka,ChanningC;Pettitt,BMontgomery;Iwahara,Junji
Due to chemical exchange, the mobility of histidine (His) side chains of proteins is typically difficult to analyze by NMR spectroscopy. Using an NMR approach that is uninfluenced by chemical exchange, we investigated internal motions of the His imidazole NH groups that directly interact with DNA phosphates in the Egr-1 zinc-finger–DNA complex. In this approach, the transverse and longitudinal cross-correlation rates for15N chemical shift anisotropy and15N–1H dipole–dipole relaxation interference were analyzed together with15N longitudinal relaxation rates and heteronuclear Overhauser effect data at two magnetic field strengths. We found that the zinc-coordinating His side chains directly interacting with DNA phosphates are strongly restricted in mobility. This makes a contrast to the arginine and lysine side chains that retain high mobility despite their interactions with DNA phosphates in the same complex. The entropic effects of side-chain mobility on the molecular association are discussed.
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DOI:
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DOI:
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DOI:
10.1021/acs.jpclett.5b01134
发表时间:
2015-07-16
期刊:
The journal of physical chemistry letters
影响因子:
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作者:
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