Structural and functional features of Pseudomonas cytochrome c peroxidase.

The secondary structure of Pseudomonas cytochrome c peroxidase (ferrocytochrome c: hydrogen-peroxide oxidoreductase, EC 1.11.1.

The primary structure of Pseudomonas cytochrome c peroxidase.

The primary structure of Pseudomonas cytochrome c peroxidase is presented. The intact protein was fragmented with cyanogen bromide into five fragments; partial cleavage was observed at a Met-His bond of the protein. The primary structure was established partly by automatic Edman degradations, partly by manual sequencing of peptides obtained with trypsin, thermolysin, chymotrypsin, pepsin, subtilisin and Staphylococcus aureus V8 endopeptidase.

A rapid-scan spectrometric and stopped-flow study of compound I and compound II of Pseudomonas cytochrome c peroxidase.

A quantitative yield of half-reduced (ferrous-ferric) cytochrome c peroxidase from Pseudomonas aeruginosa has been obtained by using either ascorbate or NADH as reductant of the resting (ferric-ferric) enzyme along with phenazine methosulfate as mediator. The formation of Compounds I and II from the half-reduced enzyme and hydrogen peroxide has been studied at 25 degrees C using rapid-scan spectrometry and stopped-flow measurements. The spectra of Compound I in the Soret and visible regions were recorded within 5 ms after mixing the half-reduced enzyme with H2O2.

Anion binding to resting and half-reduced Pseudomonas cytochrome c peroxidase.

The anion-binding characteristics of resting and half-reduced Pseudomonas cytochrome c peroxidase (ferrocytochrome c-551: hydrogen peroxide oxidoreductase, EC 1.11.1.

The formation of the primary hydrogen peroxide compound (compound I) of Pseudomonas cytochrome c peroxidase as a function of pH.

The effect of pH on the stability and overall catalytic activity of half-reduced Pseudomonas cytochrome c peroxidase was studied over the pH range 3.5-8. The stability of the enzyme as deduced from 40 s incubation experiments is virtually unaffected by pH.