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Transcript 
William S. Klug
Michael R. Cummings
Charlotte A. Spencer
Concepts of Genetics
Eighth Edition
Chapter 16
Regulation of Gene Expression
in Prokaryotes
Copyright © 2006 Pearson Prentice Hall, Inc.
Prokaryotes Exhibit Efficient
Genetic Mechanisms to
Respond to Environmental
Conditions
Lactose Metabolism in
E. coli Is Regulated by an
Inducible System
Figure 16-1
Copyright © 2006 Pearson Prentice Hall, Inc.
Structural Genes
Figure 16-2
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-3
Copyright © 2006 Pearson Prentice Hall, Inc.
IPTG
Figure 16-4
Copyright © 2006 Pearson Prentice Hall, Inc.
The Discovery of Regulatory Mutations
(constitutive mutants)
lacIlacOC
The Operon Model: Negative Control
Figure 16-5
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-5a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-5b
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-5c
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-6
Copyright © 2006 Pearson Prentice Hall, Inc.
Repressor = trans control element
Figure 16-6a
Copyright © 2006 Pearson Prentice Hall, Inc.
Operator = cis control element
Figure 16-6b
Copyright © 2006 Pearson Prentice Hall, Inc.
Genetic Proof of the Operon Model
constitutive
trans element
cis element
Table 16-1
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-7
Copyright © 2006 Pearson Prentice Hall, Inc.
The Catabolite-Activating
Protein (CAP) Exerts
Positive Control over the lac
Operon
Catabolite repression
Figure 16-8
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-8a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-8b
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-9
Copyright © 2006 Pearson Prentice Hall, Inc.
Crystal Structure Analysis
of Repressor Complexes
Has Confirmed the Operon
Model
Figure 16-10
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-11
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-11a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-111b
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-11c
Copyright © 2006 Pearson Prentice Hall, Inc.
The Tryptophan (trp)
Operon in E. coli Is a
Repressible Gene System
Figure 16-12
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-12a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-12b
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-12c
Copyright © 2006 Pearson Prentice Hall, Inc.
Attenuation Is a Critical
Process during the
Regulation of the trp Operon
in E. coli
Figure 16-13
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-13a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-13b
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-13c
Copyright © 2006 Pearson Prentice Hall, Inc.
TRAP and AT Proteins
Govern Attenuation
in B. subtilis
TRAP= trp RNA-binding attenuation protein
AT= anti-TRAP
Figure 16-14 Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-14a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-14b
Copyright © 2006 Pearson Prentice Hall, Inc.
The ara Operon Is
Controlled by a Regulator
Protein That Exerts Both
Positive and Negative
Control
Figure 16-15
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-15a
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-15b
Copyright © 2006 Pearson Prentice Hall, Inc.
Figure 16-15c
Copyright © 2006 Pearson Prentice Hall, Inc.
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