What is lackperon??????
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Posted by Anjanee Kumar Dwivedi??? 6 years, 3 months ago
- 2 answers
Yogita Ingle 6 years, 3 months ago
- Lac refers to lactose in lac operon.
- The lac operon consists of one regulatory gene the i gene which codes for the repressor of the lac operon and three structural genes (z, y, and a).
- The z gene codes for beta-galactosidase (β-gal), which hydrolyses disaccharide, lactose into galactose and glucose.
- The y gene codes for permease, which increases permeability of the cell to β-galactosides.
- The a gene encodes a transacetylase.
- Lactose is termed as inducer as lactose is the substrate for the enzyme beta-galactosidase and it regulates switching on and off of the operon.
- In the absence of inducer
- The repressor of the operon is synthesized (all-the-time – constitutively) from the i gene.
- The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.
- In the presence of inducer
- The repressor is inactivated by interaction with the inducer which allows RNA polymerase access to the promoter and transcription proceeds.
- Regulation of lac operon by repressor is referred to as negative regulation.
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Aarushi Singh 6 years, 3 months ago
1Thank You