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Journal Club

Journal Club. The Tac Promoter. What is the question?. What are the efficiencies of the trp , lac , tacI ( lac UV5 + trp ), and tacII ( trp + hybrid Pribnow+lac ) promoters? Are the hybrid promoters more efficient than the parent promoters?. What are the claims?.

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Journal Club

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  1. Journal Club The Tac Promoter

  2. What is the question? • What are the efficiencies of the trp, lac, tacI (lac UV5 + trp), and tacII (trp+ hybrid Pribnow+lac) promoters? • Are the hybrid promoters more efficient than the parent promoters?

  3. What are the claims? • The hybrid promoters are more efficient than the parent promoters • Useful for controlled expression of foreign genes at high levels

  4. What is the Proof? • Higher HGH production in tacI • Galactokinase levels (bottom of pg 24) • Made sure to control for tryptophan

  5. What Could be Wrong? • Sequencing technology was not as good • Used radioactivity to measure amount of phosphorylation

  6. What Next? • I think we already know….

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