Expression of heterologous genes in the Amsacta moorei entomopoxvirus.

Spheroidin (SPH) is the most abundant late protein in cells infected with the Amsacta moorei entomopoxvirus (AMEV). This locus can be used for expression of exogenous genes because it is not essential for virus replication. The sph promoter contains a conserved TAAATG motif, which serves as the site of initiation for both transcription and translation.

Heterodimerization of ecdysone receptor and ultraspiracle on symmetric and asymmetric response elements.

Heterodimerization of nuclear receptors is facilitated by the interaction of two dimerization interfaces: one spanning the DNA-binding (C domain) region and the adjacent hinge (D domain) region, and the other in the ligand-binding (E domain) region. Ultraspiracle (USP) heterodimerizes with ecdysone receptor (EcR) and this complex participates in ecdysone signal transduction. The natural ecdysone response elements (EcREs) discovered so far are asymmetric elements composed of either imperfect palindromes or direct repeats.

Identification and characterization of a juvenile hormone (JH) response region in the JH esterase gene from the spruce budworm, Choristoneura fumiferana.

Using a differential display of mRNA technique we discovered that the juvenile hormone (JH) esterase gene (Cfjhe) from Choristoneura fumiferana is directly induced by juvenile hormone I (JH I), and the JH I induction is suppressed by 20-hydroxyecdysone (20E). To study the mechanism of action of these two hormones in the regulation of expression of this gene, we cloned the 1270-bp promoter region of the Cfjhe gene and identified a 30-bp region that is located between -604 and -574 and is sufficient to support both JH I induction and 20E suppression. This 30-bp region contains two conserved hormone response element half-sites separated by a 4-nucleotide spacer similar to the direct repeat 4 element and is designated as a putative juvenile hormone response element (JHRE).