Journal of Bacteriology & Parasitology

Screening for inhibitor of recombinant Drosophila melanogaster tyramine-β-hydroxylase

9^th Biotechnology Congress

August 31-September 02, 2015 Orlando,Florida, USA

Md. Nazmul Hasan1, Guo Renkai1, Mayumi Yoshida1, Hiroto Ohta1,2, Jae Man Lee1, Takahiro Kusakabe2 and Akinori Hirashima1

1Kyushu University, Japan 2Kumamoto University, Japan

Posters-Accepted Abstracts: J Biotechnol Biomater

Abstract:

Biogenic amines are common biologically active substances extended within the whole animal kingdom where they play vital roles as signal transducer as well as regulator of cell functions. One of these biogenic amines called octopamine (OA) originated in the insect nervous system is synthesized from tyramine (TA) by the catalysis of tyramine-β-hydroxylase (TβH). Both tyramine and octopamine act as neurotransmitters, neurohormones and neuromodulators in the arthropod nervous system. Herein, inhibitory activity of 1-arylimidazole-2(3H)-thiones (AITs) were tested on Drosophila tyramine-β-hydroxylase (DmTβH) purified from recombinant Bombyx mori strain. Radiolabelled 3H-TA was used to analyze the activity of inhibitors and the radioactivity was measured by liquid scintillation counter. Different concentrations of AITs exhibited inhibitory effects on DmTβH which was ID50 values ranging from 0.020 nM to 2.511 μM. The most effective compounds for DmTβH inhibition were 2-Me AIT; 2-Et AIT; 4-CF3 AIT; 2,4-Me2 AIT; 2,6-Me2 AIT; 2,3,4-Cl3 AIT; 3,5-(MeO)2 AIT; 2-Me,4-Cl AIT; 2-Cl,5-Me AIT; 2-MeO,4-NO2 AIT; unsubstituted AIT; 4-MeO AIT; 4-MeS AIT; 2,5-(MeO)2 AIT and 2-Me,6-Cl AIT with ID50 values 5.820, 1.887, 0.235, 1.246, 0.020, 0.301, 3.175, 0.154, 0.796, 1.201 nM and 0.004, 0.009, 0.008, 0.009, 0.003 μM respectively. DmTβH was inhibited as a dose dependent manner at pH 7.6 and 25ºC during a 30 min of incubation. The inhibitory activity of AITs on DmTβH may be considered as lead compounds to control insect population after further extensive studies.

Biography :

Email: mn.hasan@just.edu.bd