1. CAP site
2. Plac (promoter)
3. O (operator)
4.lacZ
5. lacY
6.lacA
The so-called CAP site can be found in the lac operon along the DNA upstream of the promoter. The catabolite activator protein, a protein that can bind there, gives the CAP site its name. The CAP site is empty when glucose supplies are plentiful.
Lac operon organization. The CAP binding site, promoter (RNA polymerase binding site), operator (which overlaps with promoter), lacZ, lacY, and lacA genes are all found in the DNA of the lac operon.
The lac operon's molecular mechanism is as follows: The lac operon consists of three major structural genes, lacZ, lacY, and lacA, as well as a short promoter/operator region (P and O). Before the lac operon, there is a regulatory gene called lacI.
To learn more about repressor protein (lacl) refer to:
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