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File:Lac Operon.svg

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Summary

Description
English: 1: RNA Polymerase, 2: Repressor, 3: Promoter, 4: Operator, 5: Lactose, 6: lacZ, 7: lacY, 8: lacA.

Top: The gene is essentially turned off. There is no lactose to inhibit the repressor, so the repressor binds to the operator, which obstructs the RNA polymerase from binding to the promoter and making lactase.

Bottom: The gene is turned on. Lactose is inhibiting the repressor, allowing the RNA polymerase to bind with the promoter, and express the genes, which synthesize lactase. Eventually, the lactase will digest all of the lactose, until there is none to bind to the repressor. The repressor will then bind to the operator, stopping the manufacture of lactase.
Date
Source Own work
Author T A RAJU

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Captions

A numbered schematic showing the action of the lac repressor on the lac operon.

Items portrayed in this file

depicts

DNA

inception

18 May 2012

File history

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Date/TimeThumbnailDimensionsUserComment
current22:37, 11 June 2019Thumbnail for version as of 22:37, 11 June 2019512 × 382 (28 KB)CatPathReverted to version as of 22:32, 11 June 2019 (UTC)
22:34, 11 June 2019Thumbnail for version as of 22:34, 11 June 2019512 × 382 (28 KB)CatPathReverted to version as of 12:08, 10 April 2015 (UTC)
22:32, 11 June 2019Thumbnail for version as of 22:32, 11 June 2019512 × 382 (28 KB)CatPathCorrected mistake showing RNA polymerase and lac repressor bound to DNA simultaneously
12:08, 10 April 2015Thumbnail for version as of 12:08, 10 April 2015512 × 382 (28 KB)Evolution and evolvabilitytighter crop
13:02, 18 May 2012Thumbnail for version as of 13:02, 18 May 2012512 × 384 (22 KB)Jbmhsrward

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