4PDE:
reference: Sulphur shuttling across a chaperone during molybdenum cofactor maturation., Arnoux P, Ruppelt C, Oudouhou F, Lavergne J, Siponen MI, Toci R, Mendel RR, Bittner F, Pignol D, Magalon A, Walburger A, Nat Commun. 2015 Feb 4;6:6148. doi: 10.1038/ncomms7148. PMID: 25649206

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