Learn more about how E. coli bacteria translate sensory signals into movement in the iBiology video lecture entitled, "Marvels of Bacterial Behavior - Molecular Machinery."
Membrane-bound receptor proteins detect the presence of nutrients (A), triggering the release of a signal molecule (B), that reacts with proteins associated with the bacterium's flagellum (C), causing a change in its direction of rotation (D), which propels the organism towards increasing concentrations of nutrients. Artist: Emily Harrington. Copyright: All rights reserved. See gallery for details.
"CheY is the chemotactic response regulator, which transduces signals from the receptors to flagellar motors." (Greenfield 2009: 2)
"[R]ecent in vitro data suggest that different densities of receptors have different kinase and methylation rates, suggesting that the chemotaxis network may adjust its kinase activity based on the local concentration of receptors." (Greenfield 2009: 8)