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Genetic Switch Phage Lambda Revisited

ISBN-10: 0879697164
ISBN-13: 9780879697167
Edition: 3rd 2004 (Revised)
Authors: Mark Ptashne
List price: $40.00
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Book details

List price: $40.00
Edition: 3rd
Copyright year: 2004
Publisher: Cold Spring Harbor Laboratory Press
Publication date: 4/8/2004
Binding: Paperback
Pages: 154
Size: 6.50" wide x 8.75" long x 0.50" tall
Weight: 1.100
Language: English

Preface to the Third Edition
Preface to the First Edition
The Master Elements of Control
Components of the Switch
RNA Polymerase
The Repressor
The Action of Repressor and Cro
Negative Control
Positive Control
Cooperativity of Repressor Binding
Induction--Flipping the Switch
Cooperativity--Switch Stability and Sensitivity
The Effect of Autoregulation
Other Cases
Protein-DNA Interactions and Gene Control
The Operator
Amino Acid-Base Pair Interactions
The Promoter
Gene Control
Control Circuits--Setting the Switch
A Brief Overview of [lambda] Growth
The Genetic Map
Gene Expression
Control of Transcription
Very Early
Late Lytic
Late Lysogenic
The Decision
Control of Integration and Excision
Establishing Lysogeny
Lytic Growth
Other Phages
The SOS Response
[lambda] Pathways and Cell Development
Regulatory Genes
Patterns of Gene Expression
How Do We Know--the Key Experiments
The Repressor Idea
Clear and Virulent Mutants
Immunity and Heteroimmunity
Asymmetry in Bacterial Mating
The Repressor Problem in the Early 1960s
Repressor Isolation and DNA Binding
Making More Repressor
The Claims of Chapters One and Two
The repressor is composed of two globular domains held together by a linker of some 40 amino acids
The repressor dimerizes, largely through interaction between its carboxyl domains
A repressor dimer binds, through its amino domains, to a 17 base pair operator site
A single operator site binds one dimer of repressor
Dimers form before DNA binding
The amino domains contact DNA
There are three 17 base pair repressor binding sites in the right operator. At each site repressor and Cro bind along the same face of the helix
Chemical probes
Operator mutations
Binding to supercoiled and linear DNA
Repressor binds to three sites in O[subscript R] with alternate pairwise cooperativity. The cooperativity is mediated by interactions between carboxyl domains of adjacent dimers
In a lysogen repressor is typically bound to O[subscript R]1 and O[subscript R]2. The bound repressors turn off rightward transcription of cro and stimulate leftward transcription of cl. At higher concentrations, repressor binds to O[subscript R]3 to turn off transcription of cl
Cro binds first to O[subscript R]3, then to O[subscript R]1 and O[subscript R]2, thereby first turning off P[subscript RM], then P[subscript R]
Some background about Cro
Cro in vivo
Cro in vitro
RecA cleaves repressor to trigger induction
When Cro is bound at O[subscript R]3 the switch is thrown
Repressor and Cro bind to the operator as shown in Figures 2.6, 2.8, 2.10, and 2.11
The "helix swap" experiment
Specific amino acid-base pair contacts
The role of the arm of [lambda] repressor
Repressor activates transcription of cl by binding to O[subscript R]2 and contacting polymerase with its amino domain
Positive control mutants
Positive control in vitro
2004: New Developments
Long-range Cooperativity and Repression of P[subscript RM]
An Octamer of Repressor Binds O[subscript R] and O[subscript L]
Autonegative Regulation of Repressor Synthesis
How Do We Know
Long-range Interactions and Repression of P[subscript R]
Long-range Interactions and Repression of P[subscript RM]
Activation and Repression of P[subscript RM]
Repressor Structure
Positive Control (Activation of Transcription)
Polymerase and Promoter
The Mechanism of Activation
How Do We Know
Activating Region Variants
A Suppressor of a pc Mutant
Activator Bypass
Changing Activating Regions and Target Context
The Structure of the Repressor Monomer and the Mechanism of Repressor Cleavage
How Do We Know
Evolving the Switch
Changing the Affinities of Sites in O[subscript R] for Repressor
Eliminating Positive Control
Eliminating Cooperativity between DNA-binding Dimers
CII and the Decision

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