The trp repressor , Biology

Assignment Help:

In the lack of tryptophan shown in the figure, a trp repressor protein encoded by a split operon, trpR that is synthesized and forms a dimer.  Furthermore, this is inactive and so is unable to bind to the trp operator and the structural genes of the trp operon are transcribed.  When tryptophan is there in the figure, the enzymes for tryptophan  biosynthesis  are  not  needed  and  so  expression  of  these  genes  is turned off. This is achieved by tryptophan binding to the repressor to activate it so which it now stops transcription and binds to the operator of the structural genes. In the role tryptophan is said to be a co-repressor.

1112_22.png

Figure:  Regulation of the trp operon (a) transcription in the absence of tryptophan (b) no transcription in the presence of tryptophan.

 

 


Related Discussions:- The trp repressor

Protoplasmic - level of body organization, Protoplasmic - Level of body org...

Protoplasmic - Level of body organization Organisms which are made of just one cell are the simplest and the most primitive creatures called unicellular organisms. Their level

Spermatogenesis, Spermatogenesis: In the mature male functional sper...

Spermatogenesis: In the mature male functional sperm cells are produced within the seminiferous tubules of the testes. Around the periphery of the seminiferous tubules are l

Genomic dna from the sea urchin, Eric Davidson isolated and compared the se...

Eric Davidson isolated and compared the sequences of mRNA transcripts and genomic DNA from the sea urchin. Which of the following is a true statement regarding his findings? A.

Formation of blastopore, Formation of Blastopore The slit such as ope...

Formation of Blastopore The slit such as opening of the initial groove is the opening of the developing blastopore and its dorsal rim is termed as the dorsal lip of blastopor

Excretion in animals, Excretion in Animals Excretion is concerned alon...

Excretion in Animals Excretion is concerned along with the removal of metabolic wastes that arise as a result of oxidation of energy rich compounds and metabolism of proteins

Match the dehydration reaction, Match dehydration reaction and hydrolysis r...

Match dehydration reaction and hydrolysis reaction to molecule synthesis and molecule break-down.

Precautions for determination of fungal and yeast count, Explain Precaution...

Explain Precautions for Determination of Fungal and Yeast Count? 1. Maintain aseptic conditions. 2. Keep alcohol away from flame. 3. To avoid infections and allergies, ca

Trichomonas vaginalis - protozoan, Trichomonas vaginalis - Protozoan T...

Trichomonas vaginalis - Protozoan This cosmopolitan protozoan lives exclusively in the female vagina and male urethra or prostate. It causes a mild disease called trichomonas

Gum conditions failure to remove plaque, What gum conditions may result fro...

What gum conditions may result from a failure to remove plaque? Gingivitis (gum inflammation) and periodontal disease (infection of the socket) might be result from a failure t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd