Role of the Na(+)-translocating NADH:quinone oxidoreductase in voltage generation and Na(+) extrusion in Vibrio cholerae.
Role of the Na(+)-translocating NADH:quinone oxidoreductase in voltage generation and Na(+) extrusion in Vibrio cholerae.
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Na( )-转位 NADH:醌氧化还原酶在霍乱弧菌电压产生和 Na( ) 挤出中的作用
DOI:
10.1016/j.bbabio.2015.12.010
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Steuber
中科院分区:
文献类型:
--
作者:
Vorburger;Nedielkov;Brosig;Schunke;Steffen;Möller;Steuber
ForVibrio cholerae, the coordinated import and export of Na+is crucial for adaptation to habitats with different osmolarities. We investigated the Na+-extruding branch of the sodium cycle in this human pathogen by in vivo23Na-NMR spectroscopy. The Na+extrusion activity of cells was monitored after adding glucose which stimulated respiration via the Na+-translocating NADH:quinone oxidoreductase (Na+-NQR). In aV. choleraedeletion mutant devoid of the Na+-NQR encoding genes (nqrA-F), rates of respiratory Na+extrusion were decreased by a factor of four, but the cytoplasmic Na+concentration was essentially unchanged. Furthermore, the mutant was impaired in formation of transmembrane voltage (ΔΨ, inside negative) and did not grow under hypoosmotic conditions at pH 8.2 or above. This growth defect could be complemented by transformation with the plasmid encodednqroperon. In an alkaline environment, Na+/H+antiporters acidify the cytoplasm at the expense of the transmembrane voltage. It is proposed that, at alkaline pH and limiting Na+concentrations, the Na+-NQR is crucial for generation of a transmembrane voltage to drive the import of H+by electrogenic Na+/H+antiporters. Our study provides the basis to understand the role of the Na+-NQR in pathogenicity ofV. choleraeand other pathogens relying on this primary Na+pump for respiration.
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影响因子:
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作者:
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通讯作者:
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影响因子:
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