4Z03:
reference: The catalytic mechanism and unique low pH optimum of Caldicellulosiruptor bescii family 3 pectate lyase., Alahuhta M, Taylor LE 2nd, Brunecky R, Sammond DW, Michener W, Adams MW, Himmel ME, Bomble YJ, Lunin V, Acta Crystallogr D Biol Crystallogr. 2015 Sep;71(Pt 9):1946-54. doi:, 10.1107/S1399004715013760. Epub 2015 Aug 25. PMID: 26327384

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