5NXV

Carbonic Anhydrase II Inhibitor RA8

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.10 Å
  • R-Value Free: 0.150 
  • R-Value Work: 0.138 
  • R-Value Observed: 0.139 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Ranking Power of the SQM/COSMO Scoring Function on Carbonic Anhydrase II-Inhibitor Complexes.

Pecina, A., Brynda, J., Vrzal, L., Gnanasekaran, R., Horejsi, M., Eyrilmez, S.M., Rezac, J., Lepsik, M., Rezacova, P., Hobza, P., Majer, P., Veverka, V., Fanfrlik, J.

(2018) Chemphyschem 19: 873-879

  • DOI: 10.1002/cphc.201701104
  • Structures With Same Primary Citation

  • PubMed Abstract: 

    • Accurate prediction of protein-ligand binding affinities is essential for hit-to-lead optimization and virtual screening. The reliability of scoring functions can be improved by including quantum effects. Here, we demonstrate the ranking power of the ...

    Accurate prediction of protein-ligand binding affinities is essential for hit-to-lead optimization and virtual screening. The reliability of scoring functions can be improved by including quantum effects. Here, we demonstrate the ranking power of the semiempirical quantum mechanics (SQM)/implicit solvent (COSMO) scoring function by using a challenging set of 10 inhibitors binding to carbonic anhydrase II through Zn 2+ in the active site. This new dataset consists of the high-resolution (1.1-1.4 Å) crystal structures and experimentally determined inhibitory constant (K i ) values. It allows for evaluation of the common approximations, such as representing the solvent implicitly or by using a single target conformation combined with a set of ligand docking poses. SQM/COSMO attained a good correlation of R 2 of 0.56-0.77 with the experimental inhibitory activities, benefiting from careful handling of both noncovalent interactions (e.g. charge transfer) and solvation. This proof-of-concept study of SQM/COSMO ranking for metalloprotein-ligand systems demonstrates its potential for hit-to-lead applications.

    Organizational Affiliation: 

    Institute of Organic Chemistry and Biochemistry of the, Czech Academy of Sciences, Flemingovo nam. 2, 16610, Prague 6, Czech Republic.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Carbonic anhydrase 2
A
258Homo sapiensMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1
Find proteins for P00918 (Homo sapiens)
Go to UniProtKB:  P00918
NIH Common Fund Data Resources
PHAROS  P00918
GTEx  ENSG00000104267
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
9E2
Query on 9E2
Download CCD File 
A
2-(4-chloranyl-5-methyl-3-nitro-pyrazol-1-yl)-~{N}-(4-sulfamoylphenyl)ethanamide
C12 H12 Cl N5 O5 S
NLLZIDRHMVNNIO-UHFFFAOYSA-N		 Ligand Interaction
ZN
Query on ZN
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
9E2Ki:  4   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.10 Å
  • R-Value Free: 0.150 
  • R-Value Work: 0.138 
  • R-Value Observed: 0.139 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.043α = 90
b = 41.14β = 104.24
c = 71.962γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Czech Science FoundationCzech RepublicGA15-05677S
IMG of the Czech Academy of SciencesCzech RepublicRVO 61388963
IOCB of the Czech Academy of SciencesCzech RepublicRVO 68378050
Ministry of Education LO1304Czech RepublicLO1304

Revision History 

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2018-04-18
    Changes: Data collection, Database references