Oxidation of catalase by singlet oxygen.

The Journal of Biological Chemistry
Fernando LledíasWilhelm Hansberg

Abstract

Different bands of catalase activity in zymograms (Cat-1a-Cat-1e) appear during Neurospora crassa development and under stress conditions. Here we demonstrate that singlet oxygen modifies Cat-1a, giving rise to a sequential shift in electrophoretic mobility, similar to the one observed in vivo. Purified Cat-1a was modified with singlet oxygen generated from a photosensitization reaction; even when the reaction was separated from the enzyme by an air barrier, a condition in which only singlet oxygen can reach the enzyme by diffusion. Modification of Cat-1a was hindered when reducing agents or singlet oxygen scavengers were present in the photosensitization reaction. The sequential modification of the four monomers gave rise to five active catalase conformers with more acidic isoelectric points. The pI of purified Cat-1a-Cat-1e decreased progressively, and a similar shift in pI was observed as Cat-1a was modified by singlet oxygen. No further change was detected once Cat-1e was reached. Catalase modification was traced to a three-step reaction of the heme. The heme of Cat-1a gave rise to three additional heme peaks in a high performance liquid chromatography when modified to Cat-1c. Full oxidation to Cat-1e shifted all peaks into...Continue Reading

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