PMID: 12024218 , Related PDB ids: 1H55, 1H57, 1H58, 1H5A, 1H5C, 1H5D, 1H5E, 1H5F, 1H5G, 1H5H, 1H5I, 1H5J, 1H5L, 1H5M, 1HCH

Authors:

Berglund GI, Carlsson GH, Smith AT, Szoke H, Henriksen A, Hajdu J

Title:

The catalytic pathway of horseradish peroxidase at high resolution.

Journal:

Nature. 2002 May 23;417(6887):463-8.

Abstract:

A molecular description of oxygen and peroxide activation in biological systems is difficult, because electrons liberated during X-ray data collection reduce the active centres of redox enzymes catalysing these reactions. Here we describe an effective strategy to obtain crystal structures for high-valency redox intermediates and present a three-dimensional movie of the X-ray-driven catalytic reduction of a bound dioxygen species in horseradish peroxidase (HRP). We also describe separate experiments in which high-resolution structures could be obtained for all five oxidation states of HRP, showing such structures with preserved redox states for the first time.