NMR solution structure of DEBS ACP2(Ø). (A) Superposition of residues 14–95 for the 30 conformers from torsion angle dynamics calculation. (B) Ribbon diagram of the minimized mean structure of ACP2(Ø). (C) Electrostatic potential surface of ACP2(Ø). Positively charged areas are colored in blue, negatively charged areas are in red, and uncharged areas are in gray. Secondary structure elements are labeled as follows: helices—HI, HII′, HII, HIII′, HIII; loops—LI, LII.