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Published byEugene Mosley Modified over 9 years ago
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The Lac Operon
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Lactose = Galactose and Glucose
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Cells adapt to their environment by turning on and off genes. An operon is a cluster of bacterial genes + adjacent promoter that controls the transcription of those genes.
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A promoter = doorknob. It is kin to other operons. An operator is like the keyhole in a doorknob that is only unlocked by a specific key. specific key= regulatory protein.
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NO LACTOSE
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Lactose Present
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When the enzymes produced, they break down lactose and allolactose, then release the repressor to stop transcription.
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E. Coli prefer glucose
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When both glucose and lactose, genes for lactose metabolism are transcribed to a small extent.
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Maximal transcription occurs only when glucose is absent and lactose is present. The action of cyclic AMP and a catabolite activator protein produce this effect.
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a permease that transports lactose across the membrane beta-galactosidase which hydrolyzes lactose into glucose and galactose. a transacetylase ????? uncertain.
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