Roles of a mitochondrial AccSCO2 gene from Apis cerana cerana in oxidative stress responses.

Roles of a mitochondrial AccSCO2 gene from Apis cerana cerana in oxidative stress responses.
J Inorg Biochem. 2017 Jul 02;175:9-19
Authors: Jia H, Ma M, Zhai N, Liu Z, Wang H, Guo X, Xu B
Abstract
In eukaryotes, cytochrome c oxidase (COX) is a multimeric protein complex that is the last enzyme in the respiratory electron transport chain of mitochondria. Syntheses of cytochrome c oxidase (SCO) proteins are copper-donor chaperones involved in metalation of the CuA redox center of COX. However, its other precise actions are not yet understood. Here, we report the characterization of AccSCO2 from Apis cerana cerana (Acc). Our data showed that AccSCO2 expression was induced by cold (4°C), CdCl2, HgCl2, ultraviolet (UV) light, and H2O2 and was inhibited by different pesticide treatments. In addition, a disc diffusion assay of recombinant AccSCO2, AccSCO2-R1, and AccSCO2-R2 proteins showed that they played a functional role in protecting cells from oxidative stress involved in copper-dependent manner. Further, following knockdown of AccSCO2 in A. cerana cerana using RNA interference (RNAi), the expression levels of most antioxidant genes (AccGSTD, AccGSTO1, AccGSTS4, AccSOD1, AccSOD2, etc.) were significantly decreased in the AccSCO2-silenced bees compared with the control bees. Moreover, the antioxidant enzymatic activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) were all lower in the silenced bees than in the c...

Source: Journal of Inorganic Biochemistry - July 2, 2017 Category: Biochemistry Authors: Jia H, Ma M, Zhai N, Liu Z, Wang H, Guo X, Xu B Tags: J Inorg Biochem Source Type: research