Abstract
The entire encoding region for Momordica charantia phospholipid hydroperoxide glutathione peroxidase (McPHGPx) was cloned into pET-28a(+) vector and expressed in Escherichia coli BL21(DE3). The purified recombinant McPHGPx displayed GSH-dependent peroxidase activity towards phospholipid hydroperoxide, H2O2, and tert-butyl hydroperoxide and had the highest affinity with and catalytic efficiency for phospholipid hydroperoxide. The optimum temperature of the enzyme activity ranged from 40 to 50°C, thus it is a thermostable enzyme compared to other PHGPx enzymes. Furthermore, McPHGPx expression in Saccharomyces cerevisiae PHGPx-deletion mutant rescued the susceptibilities to the oxidation-sensitive polyunsaturated fatty acid (linolenic acid), indicating its PHGPx complementation function in yeast. These results have well documented that McPHGPx functions as a PHGPx in vitro and in vivo and will be beneficial for further functional studies on plant PHGPx enzymes.
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Abbreviations
- BHT:
-
butylated hydroxytoluene
- GPx:
-
glutathione peroxidase
- IPTG:
-
isopropyl β-D-thiogalactopyranoside
- LA:
-
linolenic acid
- (Mc)PHGPx:
-
(Momordica charantia) phospholipid hydroperoxide glutathione peroxidase
- MDA:
-
malondialdehyde
- PCOOH:
-
phosphatidylcholine hydroperoxide
- ROS:
-
reactive oxygen species
- SD/Trp− :
-
synthetic complete medium without tryptophan
- TBA:
-
thiobarbituric acid
- t-BHP:
-
tert-butyl hydroperoxide
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Published in Russian in Biokhimiya, 2009, Vol. 74, No. 5, pp. 620–628.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM08-310, February 15, 2009.
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Dong, CJ., Yang, XD. & Liu, JY. Enzymatic properties of a recombinant phospholipid hydroperoxide glutathione peroxidase from Momordica charantia and its complementation function in yeast. Biochemistry Moscow 74, 502–508 (2009). https://doi.org/10.1134/S0006297909050046
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DOI: https://doi.org/10.1134/S0006297909050046