Learn More
BACKGROUND The major royal jelly proteins/yellow (MRJP/YELLOW) family possesses several physiological and chemical functions in the development of Apis mellifera and Drosophila melanogaster. Each protein of the family has a conserved domain named MRJP. However, there is no report of MRJP/YELLOW family proteins in the Lepidoptera. RESULTS Using the YELLOW(More)
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(More)
The 30 K proteins, the major group of hemolymph proteins in the silkworm, Bombyx mori (Lepidoptera: Bombycidae), are structurally related with molecular masses of ∼30 kDa and are involved in various physiological processes, e.g., energy storage, embryonic development, and immune responses. For this report, known 30 K protein gene sequences were used as(More)
Prothoracicotropic hormone (PTTH) is one of key players in regulation of insect growth, molting, metamorphosis, diapause, and is expressed specifically in the two pairs of lateral PTTH-producing neurosecretory cells in the brain. Analysis of cis-regulatory elements of the PTTH promoter might elucidate the regulatory mechanism controlling PTTH expression. In(More)
The scaleless wings mutant in Bombyx mori (scaleless, sl) was previously reported morphologically. In the present study, we give data to clarify the mechanism of the mutation at the developmental level. Programmed cell death participates in the wing scale development during early pupal stage, and there are significant differences between that of sl and the(More)
Diapause hormone (DH) and pheromone biosynthesis activating neuropeptide (PBAN) are two crucial neuropeptides which regulate insect development and sex pheromone biosynthesis respectively. These peptides are encoded by a single gene, termed DH-PBAN gene. In this study, we characterized the promoter of the DH-PBAN gene in Helicoverpa armigera (Har).(More)
The ecdysteroid UDP-glucosyltransferase (egt) gene promoter fragments of different lengths were generated from the genomic DNA of the Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV) by PCR. After being purified and enzymatic digestion, they were cloned into the pGEM-3Z vector for construction of reporter plasmids pAcegt542-luc,(More)
The hemolymph chymotrypsin inhibitor b1 (CIb1) of silkworm, Bombyx mori, plays an important role in innate immunity. In order to study its encoding gene CIb1, five heterogeneous promoter fragments of 844 bp, 682 bp, 516 bp, 312 bp and 82 bp in length were cloned from genomic DNA of the p50 silkworm strain. Characterization of the CIb1 promoter was performed(More)
DNA helicases are essential for replication of baculoviruses. It was found that the helicase gene promoter of Bombyx mori nuclear polyhedrosis virus, including 510 bp upstream of ATG, had both early and late RNA initiation sites and could be recognized by cellular RNA polymerase. Transient expression assays in uninfected Sf-21 cells indicated that the(More)
Baculovirus GP64 envelope glycoprotein is a specific major component of the envelope of the budded virus and is involved in virus entry into the host cells by endocytosis. For promoter activity analysis in the baculovirus gp64 gene, two DNA fragments containing 437 and 439 bp upstream of 5' ends of the BmNPV and AcMNPV gp64 ORF were amplified by polymerase(More)