title: [Method for Japanese encephalitis virus NS3 protease activity analysis and high-throughput screening assay for inhibitors].
abstract: Japanese encephalitis virus (JEV) is a single-stranded and positive-sense RNA, which has a single ORF (open reading frame), encoding a polyprotein precursor. Non-structural protein 3 (NS3) plays an important role in processing the polyprotein precursor and has become an important drug target of flavivirus. In this study, NS2BH-NS3 gene was amplified by PCR and subcloned to the prokaryotic expression plasmid, resulting pET30a-NS2BH-NS3. The fusion protein was expressed in Escherichia coli BL21 (DE3) in soluble form after induction by Isopropyl beta-D-1-Thiogalactopyranoside (IPTG). The recombinant protein was purified by Ni-NTA affinity column. Then a fluorescence resonance energy transfer (FRET) method was used to determine enzymatic activity and the assay conditions were optimized. After screening 113 compounds, we found two compounds inhibiting the activity of NS2BH-NS3. This study provides a convenient and cost-effective method for screening of JEV NS3 protease inhibitor.
authors.forename: Jingyun
authors.initials: J
authors.lastname: Zhou
authors.forename: Xue
authors.initials: X
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Pei
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Song
authors.forename: Huanchun
authors.initials: H
authors.lastname: Chen
mesh_terms: D004664:Encephalitis Virus, Japanese / Q000201:enzymology*; D004926:Escherichia coli / Q000378:metabolism; D057166:High-Throughput Screening Assays; D011480:Protease Inhibitors / Q000737:chemistry*; D020365:RNA Helicases / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012697:Serine Endopeptidases / Q000378:metabolism; D017361:Viral Nonstructural Proteins / Q000378:metabolism*; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases
chemical_list: D011480:Protease Inhibitors; D020365:RNA Helicases; D011993:Recombinant Fusion Proteins; D012697:Serine Endopeptidases; D017361:Viral Nonstructural Proteins; C060028:NS3 protein, flavivirus; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases