Figure 1. Schematic diagram of Tsr and chemosensing in E. coli.

Scales in bacterial chemotaxis: A motions of a single helix in Tsr over ∼0.15 nm cause changes in the 22 nm scale structures of the receptor dimer B and trimer-of-dimers C. This in turn induces conformational changes in a hexagonal array D at the pole of the cell (with a surface area of 22000 nm²) which downstream (via diffusion of effectors along the 2000 nm cell length) results in a change the direction of rotation of the flagellar motors and the movement of the cell.