Journal
JOURNAL OF BACTERIOLOGY
Volume 187, Issue 13, Pages 4683-4688Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.187.13.4683-4688.2005
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Here we describe that the Helicobacter pylori sensor kinase produced by HP1364 and the response regulator produced by HP1365 and designated CrdS and CrdR, respectively, are both required for transcriptional induction of the H. pylori copper resistance determinant CrdA by copper ions. CrdRS-deficient mutants lacked copper induction of crdA expression and were copper sensitive. A direct role of CrdR in transcriptional regulation of crdA was confirmed by in vitro binding of CrdR to the crdA upstream region. A 21-nucleotide sequence located near the crdA promoter was shown to be required for CrdR binding.
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