Bio 3105 - Two Component Signalling in Bacteria
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Name the Indicated Regions
- A - Hook
- B - Flagella Fillament
- C - Stator
- D - Rotor
How do Bacteria change direction?
By quickly changing direction of rotation of the flagella
How does Bacteria Move away from a repellant?
By tumbling (Briefly Rotating Flagells Clockwise).
How does the Tumbling Signal work (In the case of a repellent)?
- By Going another WAY
- Repellant -> Chemottaxis Receptor -> CheW Binding (Adaptor) -> Phosphorylated CheA (Histidine Kinase) -> Activates CheY -> Motor Rotation.
What is CheY?
It is a Response Regulator, controlling the motor.
How is the "tumbling" response deactivated?
CheZ is a phosphatase that deactivates CheY.
What is one way a system can mediate Receptor Sensitivity?
What is Two Component Signalling?
Response to a Stimulus using a Receptor (Often Histidine Kinase) and a Response Regulator
How do Plants respond to Ethylene Concentrations?
Absence of Ethylene -> Activation of Receptor -> Autophosphorylation (Histidine Kinase) -> MAP Phosphorylation Cascase -> CTR1 -> Ubiquitinization of EIN3 Regulatory Protein -> Inactive Gene
What is CTR-1?
A Control Module
What is the product of Ethylene in plant signalling?
Inactive Receptor -> Gene Transcription -> Ethylene Response Proteins
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