Lac repressor molecule complex

Lac repressor molecule complex

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Credit: LAGUNA DESIGN/SCIENCE PHOTO LIBRARY

Caption: Lac repressor molecule complex. Computer model showing the tetrameric structure (green, purple) of a lac repressor complexed with DNA (pink). The LAC repressor inhibits the expression of genes that code for an enzyme which metabolizes lactose in bacteria. It is only present when lactose levels are low. This ensures that the bacteria only produce machinery used for the uptake and breakdown of lactose, when lactose is actually present.

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