1887

Abstract

Thioredoxins are small ubiquitous proteins that display different functions mainly via redox-mediated processes. The facultatively photosynthetic bacterium harbours at least two genes for thioredoxin 1 and 2, and . It is demonstrated that thioredoxin 2 of can partially replace the thioredoxin 1 function as a hydrogen donor for methionine sulfoxide reductase but cannot replace thioredoxin 1 as a subunit of phage T7 DNA polymerase. By inactivating the gene in , it is shown that thioredoxin 2 is involved in resistance against oxidative stress. As thioredoxin 1 of , thioredoxin 2 affects the oxygen-dependent expression of photosynthesis genes, albeit in an opposite way. The mutant of shows a stronger increase in photosynthesis gene expression after a decrease in oxygen tension than the isogenic wild-type strain. The expression of the gene is downregulated by oxygen.

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2003-02-01
2020-09-26
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