Define LAC Operon
Lac operon is an operon or a gaggle of genes with one promoter that encode genes for the transport and metabolism of lactose in E.coli and other bacteria.
2. What is the concept of LAC Operon?
Gene regulation in prokaryotes are often explained with the assistance of the Lac Operon model. Here the alteration in physiological and environmental conditions is often observed resulting in an alteration in expression in prokaryotes. It was observed by Jacob and Monod. The lac operon consists of:
Regulatory gene i – It codes for the repressor protein.
z gene – It codes for beta-galactosidase which catalyzes the hydrolysis of lactose into glucose and galactose.
y gene – It codes for permease which regulates the lactose permeability within the cell.
a gene – It codes for transacetylase which assists the enzyme beta-galactosidase.