A new structural paradigm in copper resistance in Streptococcus pneumoniae.

A new structural paradigm in copper resistance in Streptococcus pneumoniae.
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DOI:
10.1038/nchembio.1168
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发表时间:
2013-03
影响因子:
14.8
通讯作者:
Giedroc, David P.
Giedroc, David P.
中科院分区:
生物学1区
文献类型:
--
作者:
Fu, Yue;Tsui, Ho-Ching Tiffany;Bruce, Kevin E.;Sham, Lok-To;Higgins, Khadine A.;Lisher, John P.;Kazmierczak, Krystyna M.;Maroney, Michael J.;Dann, Charles E., III;Winkler, Malcolm E.;Giedroc, David P.

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Copper resistance has emerged as an important virulence determinant of microbial pathogens. In Streptococcus pneumoniae, copper resistance is mediated by the copper-responsive repressor CopY, CupA, and CopA, a copper effluxing P1B-type ATPase. We show here that CupA is a novel cell membrane-anchored Cu(I) chaperone, and that a Cu(I)-binding competent, membrane-localized CupA is obligatory for copper resistance. The crystal structures of the soluble domain of CupA (sCupA) and the N-terminal metal binding domain (MBD) of CopA (CopAMBD) reveal isostructural cupredoxin-like folds each harboring a binuclear Cu(I) cluster unprecedented in bacterial copper trafficking. NMR studies reveal unidirectional Cu(I) transfer from the low-affinity site on sCupA to the high-affinity site of CopAMBD. However, copper binding by CopAMBD is not essential for cellular copper resistance, consistent with a primary role of CupA in cytoplasmic Cu(I) sequestration and/or direct delivery to the transmembrane site of CopA for cellular efflux.
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