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RegulonDB is the primary database of the major international maintained curation of original literature with experimental knowledge about the elements and interactions of the network of transcriptional regulation in Escherichia coli K‐12. This includes mechanistic information about operon organization and their decomposition into transcription units (TUs), promoters and their σ type, binding sites of specific transcriptional regulators (TRs), their organization into ‘regulatory phrases’, active and inactive conformations of TRs, as well as terminators and ribosome binding sites. The database is complemented with clearly marked computational predictions of TUs, promoters and binding sites of TRs. The current version has been expanded to include information beyond specific mechanisms aimed at gathering different growth conditions and the associated induced and/or repressed genes. RegulonDB is now linked with …