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 

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Ligand Structure Quality Assessment 


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
  • Primary Citation of Related Structures:  
    5NXG, 5NXI, 5NXM, 5NXO, 5NXP, 5NXV, 5NXW, 5NY1, 5NY3, 5NY6, 5NYA

  • 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 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 ...

    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: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Carbonic anhydrase 2A258Homo sapiensMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
PHAROS:  P00918
GTEx:  ENSG00000104267
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
9E2 (Subject of Investigation/LOI)
Query on 9E2
Download Ideal Coordinates CCD File 
C [auth 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 Ideal Coordinates CCD File 
B [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
9E2 Binding MOAD:  5NXV Ki: 3.5 (nM) from 1 assay(s)
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

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Ligand Structure Quality Assessment  


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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  (Full details and data files)

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