Lac operon

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Lac operon • Visit our website: http://www.sliderbase.com/ • Free PowerPoint Presentations for teaching and learning • Outline the regulation of protein synthesis in bacteria. (Reference should be made to the lac operon in Escherichia coli). • The Lac Operon is an example of an operon that is able to regulate itself depending on the environmental conditions it is subjected to. • It codes for 3 genes: Beta-galactosidase, lactose permease and Thiogalactosidase transacetylase. These genes are involved in lactose metabolism. • If lactose is absent, the system is turned off; if lactose is present, the operon is switched on. • The bacteria’s favoured source of food is glucose and if that is present the operon does not need to be switched on, as there is no need to metabolise lactose.

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