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Overall structure of Pil Bac1 ΔN. A: PilBac1 contains a long N-terminal α-helix (blue), an unstructured αβ-loop (light blue), 4 antiparallel β-strands (green and yellow) and a conserved D-region framed by the two cysteines forming a disulfide bridge (yellow). The oxidized cysteines are shown as sticks. B, C: Electrostatic potential of PilBac1∆N. Red: negatively charged; blue: positively charged.
