6BCC

Joint X-ray/neutron structure of human carbonic anhydrase II in complex with ethoxzolamide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

"To Be or Not to Be" Protonated: Atomic Details of Human Carbonic Anhydrase-Clinical Drug Complexes by Neutron Crystallography and Simulation.

Kovalevsky, A.Aggarwal, M.Velazquez, H.Cuneo, M.J.Blakeley, M.P.Weiss, K.L.Smith, J.C.Fisher, S.Z.McKenna, R.

(2018) Structure 26: 383-390.e3

  • DOI: 10.1016/j.str.2018.01.006
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Human carbonic anhydrases (hCAs) play various roles in cells, and have been drug targets for decades. Sequence similarities of hCA isoforms necessitate designing specific inhibitors, which requires detailed structural information for hCA-inhibitor co ...

    Human carbonic anhydrases (hCAs) play various roles in cells, and have been drug targets for decades. Sequence similarities of hCA isoforms necessitate designing specific inhibitors, which requires detailed structural information for hCA-inhibitor complexes. We present room temperature neutron structures of hCA II in complex with three clinical drugs that provide in-depth analysis of drug binding, including protonation states of the inhibitors, hydration water structure, and direct visualization of hydrogen-bonding networks in the enzyme's active site. All sulfonamide inhibitors studied bind to the Zn metal center in the deprotonated, anionic, form. Other chemical groups of the drugs can remain neutral or be protonated when bound to hCA II. MD simulations have shown that flexible functional groups of the inhibitors may alter their conformations at room temperature and occupy different sub-sites. This study offers insights into the design of specific drugs to target cancer-related hCA isoform IX.


    Related Citations: 
    • Generalized X-ray and neutron crystallographic analysis: more accurate and complete structures for biological macromolecules
      Adams, P.D.,Mustyakimov, M.,Afonine, P.V.,Langan, P.
      (2009) Acta Cryst. D65: 567


    Organizational Affiliation

    Large Scale Structures Group, Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France.,Department of Biochemistry and Molecular Biology, College of Medicine, University of Florida, Gainesville, FL 32610, USA. Electronic address: rmckenna@ufl.edu.,Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. Electronic address: kovalevskyay@ornl.gov.,Scientific Activities Division, Science Directorate, European Spallation Source ERIC, 22100 Lund, Sweden; Department of Biology, Lund University, 35 Sölvegatan, 22362 Lund, Sweden.,Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.,Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Department of Biochemistry and Cellular Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Carbonic anhydrase 2
A
260Homo sapiensMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1
Find proteins for P00918 (Homo sapiens)
Go to Gene View: CA2
Go to UniProtKB:  P00918
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
EZL
Query on EZL

Download SDF File 
Download CCD File 
A
6-ethoxy-1,3-benzothiazole-2-sulfonamide
Ethoxzolamide
C9 H10 N2 O3 S2
OUZWUKMCLIBBOG-UHFFFAOYSA-N
 Ligand Interaction
DOD
Query on DOD

Download SDF File 
Download CCD File 
A
DEUTERATED WATER
D2 O
XLYOFNOQVPJJNP-ZSJDYOACSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.168 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 42.800α = 90.00
b = 41.700β = 104.60
c = 72.900γ = 90.00
Software Package:
Software NamePurpose
nCNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-02-28
    Type: Initial release
  • Version 1.1: 2018-03-21
    Type: Database references