title: Repression and autogenous stimulation in vitro by bacteriophage lambda repressor.
abstract: Purified lambda repressor protein is shown to reduce the lambda DNA-directed synthesis of proteins in vitro as determined both by net amino-acid incorporation and by analysis of specific lambda-coded proteins resolved by sodium dodecyl sulfate/polyacrylamide slab gel electrophoresis. By means of different lambda DNA templates carrying deletion and point mutations in the operators o-L or o-R, it has been possible to demonstrate repression of the synthesis of two classes of lambda proteins. The synthesis of one, class c, appears to be controlled from the operator o-L and is more efficiently repressed at low concentrations of the repressor than that of the other class of repressible lambda proteins, class d, which is controlled from the operator o-R. Several other proteins synthesized in vitro are not repressible. Some of these are coded by the J-att region. In addition, the repressor appears to have another activity, that of stimulating the synthesis of a protein identified as the repressor itself. Lambda repressor appears to stimulate its own synthesis by acting at prm, a site defined by the cis-acting mutation prm 116.
mesh_terms: D002874:Chromosome Mapping; D003090:Coliphages / Q000378:metabolism*; D004279:DNA, Viral; D004591:Electrophoresis, Polyacrylamide Gel; D005809:Genes, Regulator; D005815:Genetic Code; D009154:Mutation; D009876:Operon; D013698:Templates, Genetic; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000032:analysis / Q000096:biosynthesis*
chemical_list: D004279:DNA, Viral; D014764:Viral Proteins