2UVG:
reference: Specific recognition of saturated and 4,5-unsaturated hexuronate sugars by a periplasmic binding protein involved in pectin catabolism., Abbott DW, Boraston AB, J Mol Biol. 2007 Jun 8;369(3):759-70. Epub 2007 Mar 24. PMID: 17451747

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