The E. coli SufS-SufE sulfur transfer system is more resistant to oxidative stress than IscS-IscU.
The E. coli SufS-SufE sulfur transfer system is more resistant to oxidative stress than IscS-IscU.
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DOI:
10.1016/j.febslet.2012.10.001
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发表时间:
2012-11-16
期刊:
影响因子:
3.5
通讯作者:
Outten FW
中科院分区:
文献类型:
--
作者:
Dai Y;Outten FW
During oxidative stress in E. coli, the SufABCDSE stress response pathway mediates iron-sulfur (Fe-S) cluster biogenesis rather than the Isc pathway. To determine why the Suf pathway is favored under stress conditions, the stress response SufS-SufE sulfur transfer pathway and the basal housekeeping IscS-IscU pathway were directly compared. We found that SufS-SufE cysteine desulfurase activity is significantly higher than IscS-IscU at physiological cysteine concentrations and after exposure to H2O2. Mass spectrometry analysis demonstrated that IscS-IscU is more susceptible than SufS-SufE to oxidative modification by H2O2. These important results provide biochemical insight into the stress resistance of the Suf pathway.
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