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        Molecular cloning and characterization of a recombinant Bombyx mori tyramine-β-hydroxylase in a silkworm cell line using a baculovirus expression vector system

        Ahmed M.H. Ali,Nazmul Hasan,Renkai Guo,Hiroto Ohta,Akinori Hirashima 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3

        Octopamine (OA) and tyramine (TA) are biogenic amines that act as neurotransmitters, neurohormones, andneuromodulators in the invertebrate nervous system. Tyramine-β-hydroxylase (TβH) catalyzes the biosynthesisof OA from TA. In this study, cDNA encoding Bombyx mori TβH (BmTβH) was cloned from the brain of the silkwormB. mori. The BmTβH mRNA comprised 2204 nucleotide residues and contained an open reading frameencoding 592 amino acids. The deduced amino acid sequence shared homology to several proteins belongingto the insect TβH family. Functional expression of the cloned cDNA was obtained using a B. mori baculovirus expressionvector system. Western blot analysis revealed an immunoreactive band with a molecular mass of~67.4 kDa. Reverse-phase high-performance liquid chromatography (HPLC) was used to identify the productsformed during incubation of the enzyme reaction mixture. The optimumpH and temperature for the conversionof TA to OA were 7.5 and 25 °C, respectively. During incubation, the reaction was linear for the first 30 min at25 °C and pH 7.5. Inhibitory experiments carried out with various concentrations of an inhibitor showed thatthis method can be used for screening of BmTβH inhibitors.

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