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Chen, Bin,Kayukawa, Takumi,Monteiro, Antonia,Ishikawa, Yukio Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.6
The cytosolic members of the HSP70 family of proteins play key roles in the molecular chaperone machinery of the cell. In the study we cloned and sequenced the full-length cDNA of Delia antiqua HSP70 gene, which is 2461 bp long and encodes 643 a.a. with a calculated molecular mass of 70,787 Da. We investigated gene copies of cytosolic HSP70 members of 4 insect species with complete genome available, and found that they are quite variable with species. In order to characterize this protein we carried out an alignment and a phylogenetic analysis with 41 complete protein sequences from insects. The analysis divided the cytosolic members of the family into two classes, HSP70 and HSC70, distinguishable on the basis of 15 residues. HSP70 class members were slightly shorter in length and smaller in molecular mass relative to the HSC70 class members, and the conservative and functional regions in these sequences were documented. Mainly, we investigated the expression of Delia antiqua HSP70 gene, in response to diapauses and thermal stresses. Both summer and winter diapauses elevated HSP70 transcript levels. Cold-stress led to increased HSP70 expression levels in summer- and winter-diapausing pupae, but heat-stress elevated the levels only in the winter-diapausing pupae. In all cases, the expression levels, after being elevated, gradually decreased with time. HSP70 expression was low in non-diapausing pupae but was up-regulated following cold- and heat-stresses. Heat-stress gradually increased the mRNA level with time whereas cold-stress gradually decreased levels after an initial increase.
Kenji Shimomura,Hinoki Oikawa,Takumi Kayukawa,Satoshi Asamizu,Nobuhiro Suzuki,Shunsuke Yajima,Motohiro Tomizawa 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.3
Plant-derived compounds such as essential oils (EOs) are sources of protection for stored products. In some cases, inactive ingredients that co-occur with EOs may render them more toxic or less desirable. Thus, there has been a shift away from extract-based crude mixtures to single repellent substances. The repellency activity of the capsaicin agonist, vanillyl butyl ether (VBE), which is a thermal-sense compound affecting the transient receptor potential vanilloid (TRPV) 1 channel of mammals, was investigated for control of the red flour beetle, Tribolium castaneum. The repellency activity of VBE was dose-dependent and almost comparative to DEET in an area preference test. To clarify the mode of action, RNA interference (RNAi) was used for transcriptional knockdown of two TRPV channels, Nanchung (TcNan) or Inactive (TcIav). Reduction of each of the transcript levels led to a significant decrease in VBE repellency activity, but no significant decrease in DEET repellency. These results suggested that the repellency activity of VBE was mediated by the TRPV channels, and capsaicin agonists might serve as an alternative to EOs for the protection of stored products.