STRUCTURE OF A DIUBIQUITIN CONJUGATE AND A MODEL FOR INTERACTION WITH UBIQUITIN CONJUGATING ENZYME (E2)
THERE IS AN UNUSUAL ISOPEPTIDE BOND BETWEEN THE SIDE CHAIN OF LYS B 48 FROM ONE UBIQUITIN MOIETY AND THE CARBOXYL TERMINUS GLY A 76 OF THE OTHER UBIQUITIN MOIETY.