What is it about?
The enzyme xanthine dehydrogenase, which is required for salvage (recycling) of purine nucleotides is also needed for synthesis of the alarmone (p)ppGpp.
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Why is it important?
Since (p)ppGpp is involved in upregulation of virulence genes, this works shows that purine salvage is linked to virulence.
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This page is a summary of: Streptomyces coelicolor
XdhR is a direct target of (p)ppGpp that controls expression of genes encoding xanthine dehydrogenase to promote purine salvage, Molecular Microbiology, February 2016, Wiley,
DOI: 10.1111/mmi.13342.
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