Chapter 18 part 1 BGene regulation in Porkaryotes

Chapter 18 part 1 BGene regulation in Porkaryotes -...

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Unformatted text preview: Regulation of gene expression Chapter 18 Relevant parts Control at level of transcription C o ns titutive e xpre s s io n Re g ula te d e xpre s s io n Regulation of gene expression in bacteria Chapter 18 Pages 351-355 Relevant parts only Operons: The Basic Concept A c lus te r o f func tio na lly re la te d g e ne s c a n b e unde r c o o rdina te d c o ntro l by a single on-off switch The regulatory switch is a segment of DNA called an operator us ua lly po s itio ne d within the pro m o te r An operon is the e ntire s tre tc h o f DNA tha t inc lude s the o pe ra to r, the pro m o te r, a nd the g e ne s tha t the y c o ntro l Depending on the type of regulatory molecule that binds operator two types of regulation: Negative regulation o c c urs whe n a re g ula to ry pro te in b inds to DNA a nd s huts do wn tra ns c riptio n. Positive regulation o c c urs whe n a re g ula to ry pro te in b inds to DNA a nd trig g e rs tra ns c riptio n. Regulatory proteins bind operator Ac tiva to rs Re pre s s o rs Role of regulatory proteins in transcription regulation Role of regulatory proteins in transcription regulation Turns on Turns off Two type s o f Ne g a tive re g ula tio n:...
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This note was uploaded on 08/18/2011 for the course BIO 1406 taught by Professor Bostic during the Spring '09 term at Austin Community College.

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Chapter 18 part 1 BGene regulation in Porkaryotes -...

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