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The CodY protein is a global transcriptional regulator that controls, directly or indirectly, expression of more than 100 genes and operons in Bacillus subtilis. We used in vitro DNA affinity purification combined with massively parallel sequencing, to identify B. subtilis chromosomal DNA fragments that bind CodY in vitro. A nonstandard strand-specific analysis of the data allowed us to pinpoint CodY-binding sites at single-nucleotide resolution. By comparing the extent of binding at decreasing CodY concentrations, we were able to classify binding regions according to their relative strengths and construct a subset of the 323 strongest CodY-binding regions that included sites associated with nearly all genes reported to be direct CodY targets. Many of the identified sites were located within coding regions. At such sites within the ispA, rapA, and rapE genes CodY-dependent repression was demonstrated using lacZ fusions and mutational analysis.

Genome-wide identification of Bacillus subtilis CodY-binding sites at single-nucleotide resolution