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- W2114669304 abstract "Trehalose and trehalose metabolism are crucial for insect development. We measured the content of polyhydric compounds in the hemolymph of diapause- and nondiapause-destined individuals of Helicoverpa armigera. We found that the trehalose content is much higher in diapause-destined individuals than that in nondiapause individuals. The activity of trehalose-6-phosphate synthase (TPS) during H. armigera larval–pupal development is significantly higher in diapause-type individuals and is closely correlated with the changes in the trehalose content. The cDNA encoding TPS, which converts uridine-5′-diphosphoglucose and glucose-6-phosphate to trehalose-6-phosphate, was cloned from the fat body of H. armigera using rapid amplification of cDNA ends (RACE). The molecular characterization of the cDNA revealed that the mRNA encodes a precursor polypeptide of 826-amino-acid residues, containing Har-TPS at residues 6–507 and a putative trehalose-6-phosphate phosphatase, which converts trehalose-6-phosphate into free trehalose, at residues 512–783. The Har-TPS precursor polypeptide shows 73% identity with that of Drosophila melanogaster. The presence of a 2.8 kb transcript in the fat body and ovary was detected with a northern blot. The Har-TPS mRNA was detected at high levels in the late stage of sixth larval instar and the early middle stage of diapause-destined pupae, which are most likely to respond the changes in TPS activity and trehalose in the hemolymph. The Har-TPS protein was successfully overexpressed in the Bombyx mori baculovirus expression system, and the catalytic activity of Har-TPS was found to be approximately 5-fold higher in B. mori blood infected by the recombined-baculovirus than the control. When diapause is broken, the trehalose content drops significantly and glucose increases rapidly. These results suggest that trehalose is involved in regulating H. armigera pupal diapause." @default.
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- W2114669304 date "2008-11-12" @default.
- W2114669304 modified "2023-09-23" @default.
- W2114669304 title "Identification of a novel gene encoding the trehalose phosphate synthase in the cotton bollworm, Helicoverpa armigera" @default.
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- W2114669304 doi "https://doi.org/10.1093/glycob/cwn127" @default.
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