Evidence for Urate Hydroperoxide as an Intermediate in the Urate Oxidase Reaction
作者:Annamraju D. Sarma、Peter A. Tipton
DOI:10.1021/ja002829j
日期:2000.11.1
Antioxidation mechanisms of uric acid
作者:Michael G. Simic、Slobodan V. Jovanovic
DOI:10.1021/ja00197a042
日期:1989.7
One-electron oxidation of uric acid generates the urate radical, which was studied in aqueous solution by pulse radiolysis and oxygen-uptake measurements. Acid-base properties of the uric acid radical were determined, i.e., pKsub a1} = 3.1 plus minus} 0.1 and pKsub a2} = 9.5 plus minus} 0.1. The reaction of the radical with oxygen was too slow to be measured, k < 10sup minus}2} dmsup 3} molsup minus}1}
Absolute stereochemistry and preferred conformations of urate degradation intermediates from computed and experimental circular dichroism spectra
作者:Silvio Pipolo、Riccardo Percudani、Roberto Cammi
DOI:10.1039/c1ob05433c
日期:——
sequential formation of opticallyactive intermediates with unknown stereochemistry: (−)-5-hydroxyisourate (HIU) and (−)-2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline (OHCU). In accordance with the observation that a defect in HIU hydrolase causes hepatocarcinoma in mouse, a detoxification role has been proposed for the enzymes accelerating the conversion of HIU and OHCU into opticallyactive (+)-allantoin