10.5 Repressor protein binds to the operator and is released by inducer Figure 10.11 Constitutive mutations GTTA C T ACAAT G The lac operator ↓ has a symmetrical sequence. The sequence Is TGTTGTGTGGAATTGT GAGCGGATAACAATT T CACACA numbered relative ACAACACACCTTAACACTCGCCT ATT GTT AAAGTGTGT to the startpoint for transcription 10 +10 15 at +l. The regions of dyad symmetry Axis of symme are indicated by Purines protected的 Purines where Thymines that can be repressor against crosslinked to the shaded blocks. methylation methylat ion is enhanced by repressor repressor 请莘大Figure 10.11 The lac operator has a symmetrical sequence. The sequence is numbered relative to the startpoint for transcription at +1. The regions of dyad symmetry are indicated by the shaded blocks. 10.5 Repressor protein binds to the operator and is released by inducer