1I91

CARBONIC ANHYDRASE II COMPLEXED WITH AL-6619 2H-THIENO[3,2-E]-1,2-THIAZINE-6-SULFONAMIDE, 2-(3-HYDROXYPHENYL)-3-(4-MORPHOLINYL)-, 1,1-DIOXIDE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.151 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Structural aspects of isozyme selectivity in the binding of inhibitors to carbonic anhydrases II and IV.

Kim, C.Y., Whittington, D.A., Chang, J.S., Liao, J., May, J.A., Christianson, D.W.

(2002) J Med Chem 45: 888-893

  • DOI: 10.1021/jm010163d
  • Primary Citation of Related Structures:  
    1I91, 1I8Z, 1I90

  • PubMed Abstract: 

    • Carbonic anhydrase inhibitors are effective in lowering intraocular pressure, the primary indication of glaucoma. Human carbonic anhydrase II, and possibly carbonic anhydrase IV (CAII and CAIV, respectively), help regulate fluid secretion into the an ...

    Carbonic anhydrase inhibitors are effective in lowering intraocular pressure, the primary indication of glaucoma. Human carbonic anhydrase II, and possibly carbonic anhydrase IV (CAII and CAIV, respectively), help regulate fluid secretion into the anterior chamber of the eye. Because inhibitors currently formulated as drugs to treat glaucoma were designed to target CAII, an understanding of the structural basis of CAII-CAIV discrimination by inhibitors would be useful for probing the role of each isozyme in the etiology of the disease. Here, we report the X-ray crystal structures of three novel thieno[3,2-e]-1,2-thiazine-6-sulfonamides complexed with CAII and the computationally predicted structures of the same compounds complexed with CAIV. All three compounds bind with similar affinity to CAII, but they bind with up to 100-fold lower affinities to CAIV. Comparisons of experimentally determined structures of CAII-inhibitor complexes and computationally predicted structures of CAIV-inhibitor complexes allow us to rationalize these affinity trends and outline molecular features that may contribute to high-affinity inhibitor binding to CAIV. This study demonstrates how experimental structure determination methods and computational structure prediction methods can be used together to answer questions that cannot be answered by either method alone.

    Organizational Affiliation: 

    Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CARBONIC ANHYDRASE IIA259Homo sapiensMutation(s): 0 
Gene Names: CA2
EC: 4.2.1.1
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
NIH Common Fund Data Resources
PHAROS  P00918
GTEx  ENSG00000104267
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
INQ
Query on INQ
Download Ideal Coordinates CCD File 
A
6-[N-(3-HYDROXY-PHENYL)-3-(MORPHOLIN-4-YLMETHYL)-2H-THIENO[3,2-E]-1,2-THIAZINE-1,1,-DIOXIDE]-SULFONAMIDE
C17 H19 N3 O6 S3
PZLYYZPXSSNGJS-UHFFFAOYSA-N		 Ligand Interaction
HG
Query on HG
Download Ideal Coordinates CCD File 
A
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
INQIC50:  1.2000000476837158   nM  BindingDB
INQIC50 :  1.149999976158142   nM  PDBBind
INQIC50:  1.149999976158142   nM  BindingDB
INQKi:  0.15000000596046448   nM  BindingDB
INQIC50:  1.149999976158142   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.151 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.4α = 90
b = 41β = 104.9
c = 72.2γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-04
    Changes: Data collection