Discuss the lac-operon model of gene-expression regulation?
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the lacI gene (regulatory gene for lac operon) produces a protein that blocks RNAP from binding to the promoter of the operon. This protein can only be removed when allolactose binds to it, and inactivates it. The protein that is formed by the lacI gene is known as the lacrepressor.
A repressor protein binds the operator (control) region upstream of the operonpreventing transcription. When lactose is present outside the cell, it crosses the cell membrane and acts as an inducer of the operon. ... CAP promotes RNA polymerase transcription of genes leading to an increase of lac operon expression
Any step of gene expression may be modulated, from the DNA-RNA transcription step to post-translational modification of a protein. The following is a list of stages where gene expression is regulated, the most extensively utilised point is TranscriptionInitiation: Chromatin domains. Transcription.
A repressor protein binds the operator (control) region upstream of the operonpreventing transcription. When lactose is present outside the cell, it crosses the cell membrane and acts as an inducer of the operon. ... CAP promotes RNA polymerase transcription of genes leading to an increase of lac operon expression
Any step of gene expression may be modulated, from the DNA-RNA transcription step to post-translational modification of a protein. The following is a list of stages where gene expression is regulated, the most extensively utilised point is TranscriptionInitiation: Chromatin domains. Transcription.
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