Bray R C, Lowe D J, Barber M J
Biochem J. 1974 Jul;141(1):309-11. doi: 10.1042/bj1410309.
When xanthine oxidase turns over 1-methylxanthine aerobically at pH8.2, the time-sequence in development of its electron-paramagnetic-resonance signals is not primarily due to slow intramolecular reactions among its centres. It derives instead from gross differences in electron distribution within enzyme molecules reduced by the substrate in comparison with those that have subsequently been partly reoxidized by one-electron reaction with oxygen.
当黄嘌呤氧化酶在pH8.2的条件下有氧氧化1-甲基黄嘌呤时,其电子顺磁共振信号发展的时间序列并非主要源于其中心之间缓慢的分子内反应。相反,它源于与随后通过与氧的单电子反应而部分再氧化的酶分子相比,被底物还原的酶分子内电子分布的显著差异。