FIG. 4.

Specific cell adhesion driven by the interaction of the surface exposed leucine zipper dimerization domains. (A) Samples of induced E. coli cells expressing Fosβ, Junβ or a mixture of the same number of cells from both populations (Fosβ + Junβ) were placed at the same OD₆₀₀ in three different tubes without shaking. The photo was taken after 90 min. (B) Precipitation kinetics of E. coli cultures. The samples examined were E. coli cells expressing separately Fosβ, Junβ, and HEβ as well as mixtures of an equal number of cells expressing Junβ plus Fosβ or Junβ plus HEβ. The OD was measured from aliquots taken at ∼1 cm from the surface. The initial OD of the cultures, just after induction, was taken as 100%. (C) Phase-contrast microscopy images of induced E. coli cells placed onto microscopy slides without shaking after 90 min.