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Quantification of Hydrogen Sulfide and Cysteine Excreted by Bacterial Cells.
Bio-protocol 2018 May 21
Bacteria release cysteine to moderate the size of their intracellular pools. They can also evolve hydrogen sulfide, either through dissimilatory reduction of oxidized forms of sulfur or through the deliberate or inadvertent degradation of intracellular cysteine. These processes can have important consequences upon microbial communities, because excreted cysteine autoxidizes to generate hydrogen peroxide, and hydrogen sulfide is a potentially toxic species that can block aerobic respiration by inhibiting cytochrome oxidases. Lead acetate strips can be used to obtain semiquantitative data of sulfide evolution (Oguri et al. , 2012). Here we describe methods that allow more-quantitative and discriminatory measures of cysteine and hydrogen sulfide release from bacterial cells. An illustrative example is provided in which Escherichia coli rapidly evolves both cysteine and sulfide upon exposure to exogenous cystine (Chonoles Imlay et al. , 2015; Korshunov et al. , 2016).
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