rokaryoticgeneregulation：原核基因表達(dá)調(diào)控(編輯修改稿)
2025-02-08 08:18 本頁面
【文章內(nèi)容簡介】 orepressor) Tryptophan present, repressor active, operon off mRNA Active repressor LE 1821b_2 DNA Protein Tryptophan (corepressor) Tryptophan present, repressor active, operon off mRNA Active repressor No RNA made Copyright 169。 2022 Pearson Education, Inc. publishing as Benjamin Cummings Trp Operon Animation ? 3/ Copyright 169。 2022 Pearson Education, Inc. publishing as Benjamin Cummings Repressible and Inducible Operons: Two Types of Negative Gene Regulation ? A repressible operon is one that is usually on。 binding of a repressor to the operator shuts off transcription ? The trp operon is a repressible operon ? An inducible operon is one that is usually off。 a molecule called an inducer inactivates the repressor and turns on transcription ? The classic example of an inducible operon is the lac operon, which contains genes coding for enzymes in hydrolysis and metabolism of lactose LE 1822a DNA lacl Regulatory gene mRNA 5? 3? RNA polymerase Protein Active repressor No RNA made lacZ Promoter Operator Lactose absent, repressor active, operon off LE 1822b DNA lacl mRNA 5? 3? lac operon Lactose present, repressor inactive, operon on lacZ lacY lacA RNA polymerase Polycistronic mRNA Protein Allolactose (inducer) Inactive repressor ?Galactosidase Permease Transacetylase 5?
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