Rna

polymerase

Promoter

^ The regulator protein is a repressor, produced in an active form,...

No transcription regulator protein

bind Gene d Gene e Gene f

Promoter

No transcription

13 .and prevents transcription of the structural genes.

Precursor V (the inducer) present

Operator

^ When precursor V is present, it binds to the regulator protein and makes the regulator protein inactive.

Operator

^ When precursor V is present, it binds to the regulator protein and makes the regulator protein inactive.

Active regulator protein

Precursor V

Product W

Conclusion: The operon is turned on (and produces product W) only when precursor, V, is available.

Active regulator protein

Precursor V

0 0

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