Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Biochemistry & Molecular Biology Regular Papers
Molecular Cloning and Partial Characterization of a Peroxidase Gene Expressed in the Roots of Portulaca oleracea cv., One Potentially Useful in the Remediation of Phenolic Pollutants
Takeshi MATSUIYuki NOMURAMai TAKANOSofue IMAIHideki NAKAYAMAHitoshi MIYASAKAHiroshi OKUHATASatoshi TANAKAHideyuki MATSUURAKazuo HARADATakeshi BAMBAKazumasa HIRATAKo KATO
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Volume 75 (2011) Issue 5 Pages 882-890

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Abstract

Portulaca (Portulaca oleracea cv.) efficiently removes phenolic pollutants from hydroponic solution. In plant roots, peroxidase (PRX) is thought to be involved in the removal of phenolic pollutants by the cross-linking them to cell wall polysaccharides or proteins at the expense of reduction of hydrogen peroxide (H2O2). In this study, we found that portulaca roots secreted an acidic PRX isozyme that had relatively high H2O2 affinity. We isolated five PRX genes, and the recombinant PRX proteins produced in cultured tobacco cells were partially characterized. Among these genes, PoPRX2 probably encoded the acidic PRX isozyme. PoPRX2 had an extra N-terminal region which has not been reported for other PRX proteins. We found that PoPRX2 oxidized phenolic pollutants, including bisphenol A, octylphenol, nonylphenol, and 17β-estradiol. In addition, we found that the Cys261 residue of PoPRX2 played an important role in the determination of affinity for H2O2 and stability toward H2O2.

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© 2011 by Japan Society for Bioscience, Biotechnology, and Agrochemistry
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