chemotaxis

Peritrichous CCW rotation

Peritrichous CW rotation

How cells with a single flagellum change direction

How to test chemotactic ability of mutants

baseline behavior of cells

behavior of cells in presence of attractant

Why study chemotaxis?

How do cells sense changes in levels of attractants/repellents and transmit info to flagellum?

CheA

CheY

CheZ

How do we get more runs than tumbles when more of an attractant binds?

How does a bacteria know if it is swimming up a gradient of an attractant?

CheA as a function of the amount of attractant outside the cell

Additional steps of adaptation if INCREASE in attractant levels

Additional steps of adaptation if DECREASE in attractant levels

summary of chemotaxis

CheB

CheR