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A mixture of ananain (EC 3.4.22.31) and comosain purified from crude pineapple stem extract was found to contain numerous closely related enzyme forms. Chromatographic separation of the major enzyme forms was achieved after treatment of the mixture with thiol-modifying reagents: reversible modification with 2-hydroxyethyl disulphide provided enzyme for(More)
Catalytic antibodies are introduced as an important new class of biomolecules for molecular recognition in biosensors in which the binding sites are continually regenerated by the catalytic reaction of the substrate. Consequently, molecular recognition by catalytic antibodies can yield reversible immunoblosensors. In this example, a prototype potentiometric(More)
C11H14IO3P, Mr = 352.11, monoclinic, P2(1)/n, a = 8.300 (3), b = 14.081 (2), c = 11.326 (4) A, beta = 104.32 (3) degrees, V = 1282.6 (13) A3, Z = 4, D chi = 1.823 Mg m-3, lambda(Mo K alpha) = 0.71073 A, mu = 25.8 cm-1, F(000) = 688, R = 0.035 for 2364 observed reflections. The six-membered ring O(1), P(2), C(3), C(4), C(5), C(6) is in a chair conformation(More)
A pre-steady-state multiple-turnover kinetic burst is observed during hydrolysis of phenyl acetate by the catalytic antibody, 20G9. The burst is caused by partial product inhibition by phenol (Ki,app = 2.5 microM), which lowers both kcat and KM by almost an order of magnitude without affecting kcat/KM. The acid limb of the steady-state kcat pH profile of(More)
We report a nonhydrolytic bimolecular aminolysis reaction catalyzed by an antibody. The stereospecific formation of an amide from racemic lactone plus an aromatic amine is described by a random equilibrium bireactant kinetic sequence. The observed turnover rate may be approximated from the measured difference between the binding of reactants and the(More)
A monoclonal antibody elicited by a transition-state analog that is representative of an intramolecular six-membered ring cyclization reaction acted as a stereospecific, enzyme-like catalyst for the appropriate substrate. Formation of a single enantiomer of a delta-lactone from the corresponding racemic delta-hydroxyester was accelerated by the antibody by(More)
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