Background: Dengue protease is a two-component protease that is important for viral replication. Results: An unlinked protease complex containing the NS2B regulatory region and the NS3 protease domain was obtained. Conclusion:The unlinked protease complex produces dispersed cross-peaks in NMR spectra and exists predominantly in a closed conformation in solution.Significance: This new construct will be a useful tool for drug discovery against the dengue virus.

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