6PTP

Joint X-ray/neutron structure of HIV-1 protease triple mutant (V32I,I47V,V82I) with tetrahedral intermediate mimic KVS-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.192 

  • Method: NEUTRON DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Visualizing Tetrahedral Oxyanion Bound in HIV-1 Protease Using Neutrons: Implications for the Catalytic Mechanism and Drug Design.

Kumar, M.Mandal, K.Blakeley, M.P.Wymore, T.Kent, S.B.H.Louis, J.M.Das, A.Kovalevsky, A.

(2020) ACS Omega 5: 11605-11617

  • DOI: 10.1021/acsomega.0c00835
  • Primary Citation of Related Structures:  
    6PU8, 6PTP, 6KMP

  • PubMed Abstract: 
  • HIV-1 protease is indispensable for virus propagation and an important therapeutic target for antiviral inhibitors to treat AIDS. As such inhibitors are transition-state mimics, a detailed understanding of the enzyme mechanism is crucial for the deve ...

    HIV-1 protease is indispensable for virus propagation and an important therapeutic target for antiviral inhibitors to treat AIDS. As such inhibitors are transition-state mimics, a detailed understanding of the enzyme mechanism is crucial for the development of better anti-HIV drugs. Here, we used room-temperature joint X-ray/neutron crystallography to directly visualize hydrogen atoms and map hydrogen bonding interactions in a protease complex with peptidomimetic inhibitor KVS-1 containing a reactive nonhydrolyzable ketomethylene isostere, which, upon reacting with the catalytic water molecule, is converted into a tetrahedral intermediate state, KVS-1 TI . We unambiguously determined that the resulting tetrahedral intermediate is an oxyanion, rather than the gem -diol, and both catalytic aspartic acid residues are protonated. The oxyanion tetrahedral intermediate appears to be unstable, even though the negative charge on the oxyanion is delocalized through a strong n → π* hyperconjugative interaction into the nearby peptidic carbonyl group of the inhibitor. To better understand the influence of the ketomethylene isostere as a protease inhibitor, we have also examined the protease structure and binding affinity with keto-darunavir (keto-DRV), which similar to KVS-1 includes the ketomethylene isostere. We show that keto-DRV is a significantly less potent protease inhibitor than DRV. These findings shed light on the reaction mechanism of peptide hydrolysis catalyzed by HIV-1 protease and provide valuable insights into further improvements in the design of protease inhibitors.


    Organizational Affiliation

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HIV-1 ProteaseAB99Human immunodeficiency virus 1Mutation(s): 8 
Gene Names: pol
Find proteins for Q7SSI0 (Human immunodeficiency virus 1)
Explore Q7SSI0 
Go to UniProtKB:  Q7SSI0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
KVS
Query on KVS

Download CCD File 
B
N~2~-[(2R,5S)-5-({(2S,3S)-2-[(N-acetyl-L-threonyl)amino]-3-methylpent-4-enoyl}amino)-2-butyl-4,4-dihydroxynonanoyl]-L-glutaminyl-L-argininamide
C36 H68 N10 O10
GHZIZWOGRIROFP-WZGNFWQUSA-N
 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.192 
  • Space Group: P 21 21 2
  • Method: NEUTRON DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.234 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.497α = 90
b = 87.4β = 90
c = 46.865γ = 90
Software Package:
Software NamePurpose
nCNSrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2020-06-10
    Type: Initial release
  • Version 1.1: 2020-06-17
    Changes: Database references