3EZB:
reference: Solution structure of the 40,000 Mr phosphoryl transfer complex between the N-terminal domain of enzyme I and HPr., Garrett DS, Seok YJ, Peterkofsky A, Gronenborn AM, Clore GM, Nat Struct Biol. 1999 Feb;6(2):166-73. PMID: 10048929

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