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Characteristics of AccSTIP1 in Apis cerana cerana and its role during oxidative stress responses.
Cell Stress & Chaperones 2018 November
Various environmental stresses, such as heat shock, heavy metals, ultraviolet (UV) radiation and different pesticides, induce a cellular oxidative stress response. The cellular oxidative stress response is usually regulated by heat shock proteins (Hsps) acting as molecular chaperones. Stress-induced phosphoprotein 1 (STIP1), one of the most widely studied co-chaperones, functions as an adaptor that directs Hsp90 to Hsp70-client protein complexes. However, the biological functions of STIP1 remain poorly understood in honeybee (Apis cerana cerana). In this study, AccSTIP1 was identified in Apis cerana cerana. AccSTIP1 transcription was found to be induced by heat (42 °C), HgCl2 , H2 O2 and different pesticides (emamectin benzoate, thiamethoxam, hexythiazox and paraquat) and inhibited by CdCl2 , UV and kresoxim-methyl. Moreover, western blot analysis indicated that the expression profiles of AccSTIP1 were consistent with its transcriptional expression levels. The disc diffusion assay showed that chemically competent transetta (DE3) bacteria expressing a recombinant AccSTIP1 protein displayed the smaller death zones than did control bacteria after exposure to paraquat and HgCl2 . The DNA nicking assay suggested that recombinant purified AccSTIP1 protected supercoiled pUC19 plasmid DNA from damage caused by a thiol-dependent mixed-function oxidation (MFO) system. After knocking down AccSTIP1 gene expression via RNA interference (RNAi), the transcript levels of antioxidation-related genes were obviously lower in dsAccSTIP1 honeybees compared with those in the uninjected honeybees. Collectively, these results demonstrated that AccSTIP1 plays an important role in counteracting oxidative stress. This study lays a foundation for revealing the mechanism of AccSTIP1 in the Apis cerana cerana antioxidant system.
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