FIG 3.

Structure of ε. (A) Electron density as a mesh focused on the loop between β1 and β2 from chain A of the asymmetric unit into which the loop was built. (B) Cartoon representation of the structure of ε (PDB 4NJC) determined by X-ray crystallography to a resolution of 2.3Å. (C) Structure of phage T7 protein Gp2 (PDB 2LMC, chain A) on the left side. The electrostatic potentials of ε and Gp2, scaled between 3 kT/e (blue) and −3 kT/e (red) (with k the Boltzmann constant, T the temperature, and e the elementary charge), are shown mapped onto the protein surfaces on the right. Images were created using PyMol (version 1.3; Schrödinger, LLC) using the APBS plug-in (52).