1RAE:
reference: Crystal structure of CTP-ligated T state aspartate transcarbamoylase at 2.5 A resolution: implications for ATCase mutants and the mechanism of negative cooperativity., Kosman RP, Gouaux JE, Lipscomb WN, Proteins. 1993 Feb;15(2):147-76. PMID: 8441751

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