Write the different components of a lac-operon in E. coli. Explain its expression while in an ‘open’ state.
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Lac operon contains sites like promoter, repressor, operator, and enzyme sites.
Explanation:
- Lac operon is the operon which controls the expression of genes producing the lactase enzymes.
- This operon contains some sites like Promoter, Repressor, Operator and Enzymes.
- The promoter site is for attachment of DNA dependent RNA polymerase which transcripts the DNA to RNA.
- The repressor part of operon produces repressor protein which joins with the operator site in absence of lactose.
- The operator site presents joint for repressor protein which when joins, stops the transcription.
- The enzyme sites are those sites which presents genes for Lactase enzymes.
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