Inhibition of Zika Virus Protease by Modulating NS2B-NS3 Interactions

Area of Science:

• Virology
• Structural Biology
• Drug Discovery

Background:

• Zika virus (ZIKV) emerged globally in the mid-2010s, linked to severe developmental disorders.
• Zika Virus Protease NS2B-NS3 is a critical drug target for antiviral development.
• Understanding protease dynamics is crucial for effective treatment strategies.

Purpose of the Study:

• To investigate the dynamics of Zika Virus Protease NS2B-NS3.
• To observe how protein dynamics change with allosteric inhibitor binding.
• To identify mechanisms of protease inhibition for therapeutic development.

Main Methods:

• Hydrogen-deuterium exchange mass spectrometry (HDX-MS) was used to study NS2B-NS3.
• HDX-MS monitored protein region dynamics in unbound and inhibitor-bound states.
• Allosteric inhibitor MH1 and a specific NS3 substitution (A125C) were investigated.

Main Results:

• Zika Virus Protease adopts an open conformation when unbound or bound to MH1.
• A single substitution (A125C) in NS3 was found to block allosteric inhibition.
• HDX-MS revealed how allosteric binding at NS3 inhibits protease activity by preventing NS2B closure.

Conclusions:

• Interactions between NS2B and NS3 are critical for allosteric inhibitor potency across flaviviruses.
• These findings aid in developing pan-flaviviral inhibitors for broad antiviral applications.
• The study provides a structural basis for designing novel Zika virus therapeutics.