Fig. 1.

Architecture of the Borrelia periplasmic adaptor BesA. (A) Arrangement of 4 monomers in the P2₁2₁2₁ crystal lattice. Chain A is coloured by domain in orange (membrane proximal), yellow (β-barrel) and green (lipoyl). Dotted lines indicate the likely position of (unmodelled) residues 106–114 which have poorly defined electron density. (B) BesA monomer from the C2 space group. (C) The loop at the lipoyl domain tip represented as sticks with surrounding electron density (grey) contoured at 1σ. For this presentation the monomer is rotated 90° to (B).