2I0A

Crystal Structure of KB-19 complexed with wild type HIV-1 protease


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.161 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Discovery of HIV-1 Protease Inhibitors with Picomolar Affinities Incorporating N-Aryl-oxazolidinone-5-carboxamides as Novel P2 Ligands.

Ali, A.Reddy, G.S.Cao, H.Anjum, S.G.Nalam, M.N.Schiffer, C.A.Rana, T.M.

(2006) J Med Chem 49: 7342-7356

  • DOI: 10.1021/jm060666p
  • Primary Citation of Related Structures:  
    2I0A, 2I0D

  • PubMed Abstract: 
  • Here, we describe the design, synthesis, and biological evaluation of novel HIV-1 protease inhibitors incorporating N-phenyloxazolidinone-5-carboxamides into the (hydroxyethylamino)sulfonamide scaffold as P2 ligands. Series of inhibitors with variations at the P2 phenyloxazolidinone and the P2' phenylsulfonamide moieties were synthesized ...

    Here, we describe the design, synthesis, and biological evaluation of novel HIV-1 protease inhibitors incorporating N-phenyloxazolidinone-5-carboxamides into the (hydroxyethylamino)sulfonamide scaffold as P2 ligands. Series of inhibitors with variations at the P2 phenyloxazolidinone and the P2' phenylsulfonamide moieties were synthesized. Compounds with the (S)-enantiomer of substituted phenyloxazolidinones at P2 show highly potent inhibitory activities against HIV-1 protease. The inhibitors possessing 3-acetyl, 4-acetyl, and 3-trifluoromethyl groups at the phenyl ring of the oxazolidinone fragment are the most potent in each series, with K(i) values in the low picomolar (pM) range. The electron-donating groups 4-methoxy and 1,3-dioxolane are preferred at P2' phenyl ring, as compounds with other substitutions show lower binding affinities. Attempts to replace the isobutyl group at P1' with small cyclic moieties caused significant loss of affinities in the resulting compounds. Crystal structure analysis of the two most potent inhibitors in complex with the HIV-1 protease provided valuable information on the interactions between the inhibitor and the protease enzyme. In both inhibitor - enzyme complexes, the carbonyl group of the oxazolidinone ring makes hydrogenbond interactions with relatively conserved Asp29 residue of the protease. Potent inhibitors from each series incorporating various phenyloxazolidinone based P2 ligands were selected and their activities against a panel of multidrug-resistant (MDR) protease variants were determined. Interestingly, the most potent protease inhibitor starts out with extremely tight affinity for the wild-type enzyme (K(i) = 0.8 pM), and even against the MDR variants it retains picomolar to low nanomolar K(i), which is highly comparable with the best FDA-approved protease inhibitors.


    Organizational Affiliation

    Chemical Biology Program, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ProteaseA, B99Human immunodeficiency virus 1Mutation(s): 1 
Gene Names: pol
UniProt
Find proteins for O38723 (Human immunodeficiency virus 1)
Explore O38723 
Go to UniProtKB:  O38723
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MUI (Subject of Investigation/LOI)
Query on MUI

Download Ideal Coordinates CCD File 
E [auth A](5S)-3-(4-ACETYLPHENYL)-N-[(1S,2R)-1-BENZYL-2-HYDROXY-3-{ISOBUTYL[(4-METHOXYPHENYL)SULFONYL]AMINO}PROPYL]-2-OXO-1,3-OXAZOLIDINE-5-CARBOXAMIDE
C33 H39 N3 O8 S
BUJKGFQFFGUYEM-YPKYBTACSA-N
 Ligand Interaction
PO4
Query on PO4

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], G [auth B], H [auth B]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
F [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
MUI PDBBind:  2I0A Ki: 4.00e-3 (nM) from 1 assay(s)
BindingDB:  2I0A Ki: min: 4.00e-3, max: 1.94 (nM) from 4 assay(s)
Binding MOAD:  2I0A Ki: 4.00e-3 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.161 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.769α = 90
b = 57.656β = 90
c = 61.892γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-19
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations