Abstract
Damage caused toSaccharomyces cerevisiae SY4 plasma membrane H+-ATPase by Fe- and Cu-Fenton reagents was determined in secretory vesicles containing enzyme in which Cys residues were replaced singly or in pairs by Ala. Cys-221 situated in a β-sheet domain between M2 and M3 segments, phosphorylation domain-located Cys-409 and Cys-532 situated at the ATP-binding site play a role in the inactivation. In the presence of all three residues the enzyme exhibited a certain basic inactivation, which did not change when Cys-532 was replaced with Ala. In mutants having intact Cys-532 but lacking one or both other cysteines, replacement of Cys-221 with Ala led to lower inactivation, suggesting that Cys-221 may serve as a target for metal-catalyzed oxidation and intact Cys-532 promotes this target role of Cys-221. In contrast, the absence of Cys-409 caused higher inactivation by Fe-Fenton. Cys-532 thus seems to serve as a target for Fe-Fenton, intact Cys-409 causing a conformational change that makes Cys-532 less accessible to oxidation. The mutant lacking both Cys-221 and Cys-409 is more sensitive to Fe-Fenton than to Cu-Fenton and the absence of both Cys residues thus seems to expose presumable extra Fe-binding sites. These data and those on protection by ATP, ADP, 1,4-dithiothreitol and deferrioxamine B point to complex interactions between individual parts of the enzyme molecule that determine its sensitivity towards Fenton reagents. ATPase fragmentation caused by the two reagents differed in that the Fe-Fenton reagent produced in Western blot “smears” whereas the Cu-Fenton reagent produced defined fragments.
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The work was supported byGrant Agency of the Academy of Sciences of the Czech Republic (grant S5020202),Ministry of Education, Youth and Sports of the Czech Republic (grant ME 577), byBundesministerium für Bildung und Forschung (grant CZE 01-032) and byInstitutional Research Concept AV 0Z 502903.
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Stadler, N., Váchová, L., Krasowska, A. et al. Role of strategic cysteine residues in oxidative damage to the yeast plasma membrane H+-ATPase caused by Fe- and Cu-containing fenton reagents. Folia Microbiol 48, 589–596 (2003). https://doi.org/10.1007/BF02993464
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DOI: https://doi.org/10.1007/BF02993464