The Juvenile Hormone Binding Protein in the Hemolymph of Manduca sexta Johannson (Lepidoptera: Sphingidae).

Purification and characterization of the carrier protein for juvenile hormone from the hemolymph of the tobacco hornworm Manduca sexta Johannson (Lepidoptera: Sphingidae).

The larval hemolymph of the tobacco hornworm, Manduca sexta, contains a carrier protein that binds specifically and with high affinity the juvenile hormone, an important regulator of insect development. This protein serves to transport the hormone and to protect it from the action of degradative enzymes during early larval stages. Using hemolymph from the last larval stage, we have isolated a p...

Specificity of the juvenile hormone binding protein: The geometrical isomers of juvenile hormone I.

The binding of the geometrical isomers (>/=99% pure) of juvenile hormone I to the hemolymph juvenile hormone binding protein of Manduca sexta (Lepidoptera, Sphingidae) was analyzed. A technique is described for isomer separation by micropreparative high-resolution liquid chromatography. Analysis of competition was performed by using a "batch adsorption" hydroxylapatite binding assay. Competitio...

The Putative AKH Receptor of the Tobacco Hornworm, Manduca sexta, and Its Expression

Adipokinetic hormones are peptide hormones that mobilize lipids and/or carbohydrates for flight in adult insects and activate glycogen Phosphorylase in larvae during starvation and during molt. We previously examined the functional roles of adipokinetic hormone in Manduca sexta L. (Lepidoptera: Sphingidae). Here we report the cloning of the full-length cDNA encoding the putative adipokinetic ho...

Mechanistic studies of the degradation of juvenile hormone esterase in Manduca sexta.

The mechanisms of degradation of juvenile hormone esterase (JHE) were investigated in larvae of the tobacco hornworm, Manduca sexta. JHE is removed from the hemolymph by the pericardial cells by receptor-mediated endocytosis and is ultimately degraded in the lysosomes. Immunoprecipitation experiments and native PAGE followed by Western blotting showed that JHE associates with a putative heat sh...

The Effect of Larval Diet and Sex on Nectar Nicotine Feeding Preferences in Manduca Sexta (Lepidoptera: Sphingidae)