Physical organic chemistry of benzisoxazoles. III. Mechanism and the effects of solvents on rates of decarboxylation of benzisoxazole-3-carboxylic acids
The invention provides antimicrobial agents and methods of using the agents for sterilization, sanitation, antisepsis, disinfection, and treatment of infections in mammals.
这项发明提供了抗菌剂和使用这些剂进行哺乳动物的消毒、卫生、防腐、消毒和治疗感染的方法。
Carbon kinetic isotope effects on the spontaneous and antibody-catalyzed decarboxylation of 5-nitro-3-carboxybenzisoxazole
作者:Cristina Lewis、Piotr Paneth、Marion H. O'Leary、Donald Hilvert
DOI:10.1021/ja00057a025
日期:1993.2
efficiently catalyzes the decarboxylation of a substituted 3-carboxybenzisoxazole-a simple, unimolecular reaction that is not susceptible to general acid /base catalysis but that is highly sensitive to the micro-environment. The transition-state structure of this decarboxylation reaction has been probed by measuring the carbon kinetic isotope effect for the uncatalyzed decarboxylation in water and for the
The invention provides antimicrobial agents and methods of using the agents for sterilization, sanitation, antisepsis, disinfection, and treatment of infections in mammals.
Investigation of Medium Effects in a Family of Decarboxylase Antibodies
作者:Theodore M. Tarasow、Cristina Lewis、Donald Hilvert
DOI:10.1021/ja00097a001
日期:1994.9
A family of naphthalenedisulfonate-binding antibodies catalyze the decarboxylation of 5-nitro-3-carboxybenzisoxazole, providing a series of structurally similar catalysts for investigating the influence of protein microenvironment on reactivity. Eight representative catalysts and one noncatalytic hapten binder have been characterized in detail to assess their catalytic properties. The Michaelis-Menten parameters, inhibition constants for hapten and product, and thermodynamic activation parameters are reported for each catalyst. The rate accelerations provided by the catalytic antibodies range from 1620 to 23 200. The antibodies display similar affinities for the hapten, substrate, and product, suggesting that binding differences are not the major cause of the variation in catalytic activity. Instead, catalytic efficiency appears to correlate roughly with-the hydrophobicity of the antibody active site as judged by fluorescence spectroscopy. Furthermore, five of the-catalytic antibodies fit an isokinetic relationship, displaying a wide variation in thermodynamic activation parameters characterized by enthalpy-entropy compensation. The data illustrate the potential of similar proteins to solve a specific chemical problem in slightly different ways and warrant detailed structural investigations to determine the precise combination of hydrogen bonding, electrostatic, and dispersive interactions that constitute medium effects in these related proteins.