1TOA:
reference: Treponema pallidum TroA is a periplasmic zinc-binding protein with a helical backbone., Lee YH, Deka RK, Norgard MV, Radolf JD, Hasemann CA, Nat Struct Biol 1999 Jul;6(7):628-33. PMID: 10404217

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