... described in the text. After removal of unbound cobalamin at 0 min (thick solidline), 30 min (thin solid line), 60 min (thin long-dashed line),120 min (thin short-dashed line), 240 min (thin dotted ... damagedcofactors) for free adeninylpentylcobalamin (AdePeCbl)(an inactive coenzyme analog containing the adeninering in the upper axial ligand; a model of intact coen-zyme, AdoCbl) in the presence of ATP and ... between its adenine moiety and the enzymes’s adenine-binding pocket stabilizesthe interaction between the enzyme a and b subunits. In contrast, even in the absence of ADP, the reactivaseforms...