What is the role of the repressor protein in the transcription of the trp operon?
Added by John F.
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It is regulated by a repressor protein that controls the transcription of these genes. Show more…
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The trp operon is considered to be repressible because: 1.The repressor binds to the operator, blocking RNA polymerase from transcribing, unless tryptophan is ABSENT 2.The repressor binds to the operator, blocking RNA polymerase from transcribing, unless tryptophan is PRESENT 3.The repressor binds to RNA polymerase at the promoter to help it find the -10 sequence 4.The trp operon has five genes that code for enzymes needed to synthesize tryptophan, only expressed when trp is PRESENT
Adi S.
The Trp operon is a coordinately regulated group of genes (trpA-trpE) that are required for tryptophan synthesis in E. coli. The presence of excess tryptophan, which causes the repressor to be attached to the operator, results in decreased transcription of the trp operon. Explain the consequences to the cell of a mutation at the regulatory gene locus (trpR) that prevents binding of the repressor protein. RNA Polymerase Promoter DNA Pg_trpR Operator trpE ltrpD ltrpC trpB Active Repressor 5'-3' trpR mRNA Inactive Repressor Active Repressor
Shyam P.
The Trp operon is a coordinately regulated group of genes (trpA-trpE) that are required for tryptophan synthesis in E. coli. The presence of excess tryptophan, which causes the repressor to be attached to the operator, results in decreased transcription of the trp operon. Explain the consequences to the cell of a mutation at the regulatory gene locus (trpR) that prevents binding of the repressor protein.
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