Unique conformation of uridine and asymmetry of the hexameric molecule revealed in the high-resolution structures of Shewanella oneidensis uridine phosphorylase in the free form and in complex with uridine
4r2x is a 6 chain structure. This structure supersedes the now removed PDB entry 4hen. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.