title: Tryptophanyl-tRNA and tryptophanyl-tRNA synthetase are not required for in vitro repression of the tryptophan operon.
mesh_terms: D000604:Amino Acyl-tRNA Synthetases / Q000302:isolation & purification / Q000378:metabolism*; D002474:Cell-Free System; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D004247:DNA; D004926:Escherichia coli / Q000378:metabolism*; D005809:Genes, Regulator; D008970:Molecular Weight; D009876:Operon; D012343:RNA, Transfer / Q000302:isolation & purification / Q000378:metabolism*; D013698:Templates, Genetic; D014158:Transcription, Genetic; D014364:Tryptophan / Q000096:biosynthesis*
chemical_list: D014364:Tryptophan; D004247:DNA; D012343:RNA, Transfer; D000604:Amino Acyl-tRNA Synthetases