De novo design of a transmembrane Zn²⁺-transporting four-helix bundle.
De novo design of a transmembrane Zn²⁺-transporting four-helix bundle.
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DOI:
10.1126/science.1261172
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发表时间:
2014-12-19
期刊:
影响因子:
--
通讯作者:
DeGrado WF
中科院分区:
文献类型:
--
作者:
Joh NH;Wang T;Bhate MP;Acharya R;Wu Y;Grabe M;Hong M;Grigoryan G;DeGrado WF
The design of functional membrane proteins from first principles represents a grand challenge in chemistry and structural biology. Here, we report the design of a membrane-spanning, four-helical bundle that transports first-row transition metal ions Zn2+ and Co2+, but not Ca2+, across membranes. The conduction path was designed to contain two di-metal binding sites that bind with negative cooperativity. X-ray crystallography and solid-state and solution nuclear magnetic resonance indicate that the overall helical bundle is formed from two tightly interacting pairs of helices, which form individual domains that interact weakly along a more dynamic interface. Vesicle flux experiments show that as Zn2+ ions diffuse down their concentration gradients, protons are antiported. These experiments illustrate the feasibility of designing membrane proteins with predefined structural and dynamic properties.
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DOI:
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发表时间:
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影响因子:
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通讯作者:
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