<p>This entry represents a protein, WrbA, related to and slightly larger than flavodoxin. In <taxon tax_id="562">Escherichia coli</taxon>, this protein is produced during stationary phase, binds to the trp repressor, and makes trp operon repression more efficient. WrbA does not interact with the trp operator by itself. Three copies are found in <taxon tax_id="382">Rhizobium meliloti</taxon> (Sinorhizobium meliloti), and members are found in species in which homologs of the E. coli trp operon repressor TrpR (<db_xref db="SWISSPROT" dbkey="P03032"/>) are not detected.</p> Flavoprotein WrbA