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Purification and characterization of chorion peroxidase from Aedes aegypti eggs.

Abstract：

:Previous study has shown that a peroxidase is present in the mature eggs of Aedes aegypti mosquitoes, and the enzyme is involved in the formation of a rigid and insoluble chorion by catalyzing chorion protein crosslinking through dityrosine formation. In this study, chorion peroxidase was solubilized from egg chorion by 1% SDS and 2 M urea and purified by various chromatographic techniques. The enzyme has a relative molecular mass of 63,000 as estimated by SDS-PAGE. Spectral analysis of the enzyme revealed the presence of the Soret band with a lambda(max) at 415 nm, indicating that chorion peroxidase is a hemoprotein. Treatment of the native enzyme with H2O2 in excess in the absence of reducing agents shifted the Soret band from 415 to 422 nm, and reduction of the native enzyme with sodium hydrosulfite under anaerobic conditions changed the Soret band from 415 to 446 nm. These results show that the chorion peroxidase behaves similarly to other peroxidases under oxidative and reductive conditions, respectively. Compared to other peroxidases, the chorion peroxidase, however, is extremely resistant to denaturing agents, such as SDS and organic solvents. For example, chorion peroxidase remained active for several weeks in 1% SDS, while horseradish peroxidase irreversibly lost all its activity in 2 h under the same conditions. Comparative analysis between mosquito chorion peroxidase and horseradish peroxidase showed that the specific activity of chorion peroxidase to tyrosine was at least 100 times greater than that of horseradish peroxidase to tyrosine. Chorion peroxidase is also capable of catalyzing polypeptide and chorion protein crosslinking through dityrosine formation during in vitro assays. Our data suggest that the characteristics of the chorion peroxidase in mosquitoes closely reflect its functions in chorion formation and hardening.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Han Q,Li G,Li J

doi

10.1006/abbi.2000.1821

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

107-15

issue

1

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(00)91821-6

journal_volume

378

pub_type

杂志文章

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