Dual-control of the tryptophan operon is mediated by both tryptophanyl-tRNA synthetase and the repressor.
D000604:Amino Acyl-tRNA Synthetases / Q000378:metabolism*; D002874:Chromosome Mapping; D004794:Enzyme Repression; D004926:Escherichia coli / Q000201:enzymology*; D005838:Genotype; D009876:Operon; D012343:RNA, Transfer / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism; D013045:Species Specificity; D014158:Transcription, Genetic; D014364:Tryptophan / Q000096:biosynthesis*; D014369:Tryptophan-tRNA Ligase / Q000378:metabolism*
D014364:Tryptophan; D012343:RNA, Transfer; D000604:Amino Acyl-tRNA Synthetases; D014369:Tryptophan-tRNA Ligase