Biocatalysis and Agricultural Biotechnology, Volume (21), No (1), Year (2019-9) , Pages (101285-101293)

Title : ( A novel nitrile-degrading enzyme (nitrile hydratase) from Ralstonia sp.ZA96 isolated from oil-contaminated soils )

Authors: Abbas Heidari , Ahmad Asoodeh ,

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Abstract

In this study, a bacterial strain with capable of degrading nitrile compounds was isolated from oil-contaminated soils. Aacrylonitrile removal by the bacterium was analyzed using gas chromatography-mass spectrometry (GC-MS). The isolate was identified as Ralstonia sp.ZA96 by biochemical and molecular analyses. Purification of nitrile hydratase from the strain was performed using Q-Sepharose chromatography. The results showed that the 23 kDa-purified enzyme had an optimal activity at pH 8.5 and 25 °C. Zn2+ ion (at 10 mM) and Ca2⁺ ion (at 2 mM) had a positive and negative effect on the enzyme activity, respectively. Ethylenediaminetetraacetic acid (EDTA) caused a significant reduction in the enzyme activity. The activity in the presence of 5, 5′-dithiobis-(2-nitrobenzoic acid) (DTNB) and dithiothreitol (DTT) was almost maintained, whereas SDS at 10 mM reduced 43% of the enzyme activity. Dimethyl sulfoxide (DMSO) and allyl alcohol had a positive effect on enzyme activity, while chloroform decreased the enzyme activity. The studied enzyme showed a high specificity to aliphatic nitriles including potassium ferrocyanide, potassium hexacyanoferrate, and ammonium thiocyanate. Our results suggest that this nitrile-degrading enzyme had potential to be utilized as a novel candidate for industrial applications.

Keywords

Ralstonia sp.ZA96 Nitrile hydratase Aacrylonitrile
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@article{paperid:1075424,
author = {Heidari, Abbas and Asoodeh, Ahmad},
title = {A novel nitrile-degrading enzyme (nitrile hydratase) from Ralstonia sp.ZA96 isolated from oil-contaminated soils},
journal = {Biocatalysis and Agricultural Biotechnology},
year = {2019},
volume = {21},
number = {1},
month = {September},
issn = {1878-8181},
pages = {101285--101293},
numpages = {8},
keywords = {Ralstonia sp.ZA96 Nitrile hydratase Aacrylonitrile},
}

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%0 Journal Article
%T A novel nitrile-degrading enzyme (nitrile hydratase) from Ralstonia sp.ZA96 isolated from oil-contaminated soils
%A Heidari, Abbas
%A Asoodeh, Ahmad
%J Biocatalysis and Agricultural Biotechnology
%@ 1878-8181
%D 2019

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