1LR0:
reference: Structure of the periplasmic domain of Pseudomonas aeruginosa TolA: evidence for an evolutionary relationship with the TonB transporter protein., Witty M, Sanz C, Shah A, Grossmann JG, Mizuguchi K, Perham RN, Luisi B, EMBO J 2002 Aug 15;21(16):4207-18. PMID: 12169623

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).