Lactose repressor

C: The lactose operon of E.coli consists of three genes: lacZ encodes β-galactosidase, lacY encodes ... cell, lacA encodes galactoside-transacetylase. Lac operon is under the control of LacI (repressor), which is inactive in the presence of lactose (inductor). There is a wide diversity ...

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... Lac a Lac Z encodes for beta-galactosidase that is a lactase: cleaves lactose (the sugar). Lac y encodes for Galactoside permease that promotes ... represses lac O (negative control): in the presence of glucose, a repressor protein is released, it is able to bind to Lac O DNA sequence only ...

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... of B-gal when grown in glucose medium and 1500 units when grown in lactose medium. How much B-gal would you expect in each of the following ... we are forced to look only at the second strand which is i-, but enough repressor will be made by i+ on the other strand so this will be repressed ...

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... 4) two lac operator sequences, 5) a Shine-Delgarno sequence, and 6) the lactose operon repressor gene (lacIq). The origin of replication (oriC) is derived from pUC19 (LT1, Gaithersburg, ...

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... though I guess a bit late for the question: Technically, allolactose is the inducer. e. coli converts a small amount of lactose to allolactose and this then binds to the repressor.

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