Structural basis for heavy metal detoxification by an Atm1-type ABC exporter.
Structural basis for heavy metal detoxification by an Atm1-type ABC exporter.
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DOI:
10.1126/science.1246489
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发表时间:
2014-03-07
期刊:
影响因子:
--
通讯作者:
Rees DC
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文献类型:
--
作者:
Lee JY;Yang JG;Zhitnitsky D;Lewinson O;Rees DC
While significant progress has been achieved in the structural analysis of exporters from the superfamily of ATP Binding Cassette (ABC) transporters, much less is known about how they selectively recognize substrates and how substrate binding is coupled to ATP hydrolysis. We have addressed these questions through the crystallographic analysis at 2.4 Å resolution of the Atm1/ABCB7/HMT1/ABCB6 ortholog from Novosphingobium aromaticivorans DSM 12444. Consistent with a physiological role in cellular detoxification processes, functional studies demonstrate that glutathione derivatives can serve as substrates for NaAtm1 and overexpression in E. coli confers protection against silver and mercury toxicity. The glutathione binding site highlights the articulated design of ABC exporters, with ligands and nucleotides spanning structurally conserved elements to create adaptable interfaces accommodating conformational rearrangements during the transport cycle.
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DOI:
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发表时间:
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期刊:
Science (New York, N.Y.)
影响因子:
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