Kinetic studies on the inhibition mechanism of diamine oxidase from porcine kidney by aminoguanidine

Journal of Biochemistry
H TamuraT Watanabe

Abstract

The mechanism of inhibition of diamine oxidase [DAO, histaminase, amine: oxygen oxidoreductase (deaminating) (copper-containing), EC 1.4.3.6] by aminoguanidine was studied kinetically. The DAO reaction was carried out with putrescine as a substrate in the presence of o-aminobenzaldehyde and followed by the continuous increase in A430. An enzymatic reaction product, 4-aminobutyraldehyde, was spontaneously cyclized to delta 1-pyrroline, which coupled with o-aminobenzaldehyde to give rise to a yellow quinazolinium chromophore [Holmstedt et al. (1961) Biochim. Biophys. Acta 48, 182-186]. First, to measure the initial velocities as accurately as possible, the kinetic relationship between the oxidase reaction rate and the color development rate was formulated. The reaction proceeded linearly in the absence of aminoguanidine, but slowed down time-dependently in its presence. When the color development velocities in the presence of the inhibitor were plotted against time, the plot was nonlinear and there seemed to be at least two phases of the inhibition. Nonlinear least-squares analysis of the data dA430/dt showed that the simplest model that fitted best was a model composed of two species of enzyme-inhibitor complexes: E + I k+1 in e...Continue Reading

Citations

Dec 1, 1999·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·Gunnar Houen
Jun 5, 2003·Melanoma Research·Zsuzsa DarvasAndras Falus
Aug 29, 2013·Oxidative Medicine and Cellular Longevity·Hana YangYong Seek Park
Apr 1, 1995·Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]·H G SchwelbergerE Bodner
Mar 14, 2002·European Journal of Pharmacology·Junichi KitanakaMotohiko Takemura
Mar 10, 2001·Journal of Inorganic Biochemistry·J A Kucha, D M Dooley
Apr 27, 2000·Carbohydrate Research·Y HuangM V Novotny
Feb 10, 2009·Academic Radiology·Michael A KuefnerHubert G Schwelberger

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