Thomas, M.P.; Topham, C.M.; Kowlessur, D.; Mellor, G.W.; Thomas, E.W.; Whitford, D.; Brocklehurst, K.
Structure of chymopapain M the late-eluted chymopapain deduced by comparative modelling techniques and active-centre characteristics determined by pH-dependent kinetics of catalysis and reactions with time-dependent inhibitors: the Cys-25/His-159 ion-pair is insufficient for catalytic competence in both chymopapain M and papain (1994), Biochem. J., 300, 805-820.