Haloperoxidase

Haloperoxidase

Haloperoxidases are peroxidases that are able to mediate the oxidation of halides by hydrogen peroxide [S.L. Neidleman, J. Geigert (1986) Biohalogenation - principles, basic roles and applications; Ellis Horwood Ltd Publishers; Chichester; ISBN 0-85312-984-3] . Both halides and hydrogen peroxide are widely available in the environment.

The Nernst equation shows that hydrogen peroxide can oxidise chloride (E°= 1.36 V), bromide (E°= 1.09 V) and iodide (E°= 0.536 V) from a thermodynamic perspective under natural conditions, i.e. a temperature range of about 0-30 °C and a pH ranging from about 3 (humic soil layer) to about 8 (sea water). Fluoride (E°= 2.87 V) cannot be oxidised by hydrogen peroxide. The table shows the classification of haloperoxidases according to the halides which oxidation they are able to catalyse.

References


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