2Q1Q

Carbonic anhydrase inhibitors. Interaction of the antiepileptic drug sulthiame with twelve mammalian isoforms: kinetic and X-Ray crystallographic studies

• PDB DOI:  https://doi.org/10.2210/pdb2Q1Q/pdb

• Classification: LYASE
• Mutation(s): No 


• Deposited: 2007-05-25 Released: 2007-09-11 
• Deposition Author(s): Temperini, C., Innocenti, A., Mastrolorenzo, A., Scozzafava, A., Supuran, C.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.251 
• R-Value Work: 0.197 
• R-Value Observed: 0.200 

Literature

Carbonic anhydrase inhibitors. Interaction of the antiepileptic drug sulthiame with twelve mammalian isoforms: Kinetic and X-ray crystallographic studies.

Temperini, C., Innocenti, A., Mastrolorenzo, A., Scozzafava, A., Supuran, C.T.

(2007) Bioorg Med Chem Lett 17: 4866-4872

• PubMed: 17588751 
• DOI: https://doi.org/10.1016/j.bmcl.2007.06.044
• Primary Citation of Related Structures:  
  2Q1Q


• PubMed Abstract: 
  

Sulthiame, a clinically used antiepileptic, was investigated for its interaction with 12 catalytically active mammalian carbonic anhydrase (CA, EC 4.2.1.1) isoforms. The drug is a potent inhibitor of CA II, VII, IX, and XII (K(I)s of 6-56 nM), and a medium potency inhibitor against CA IV, VA, VB, and VI (K(I)s of 81-134 nM). The high resolution crystal structure of the hCA II-sulthiame adduct revealed a large number of favorable interactions between the drug and the enzyme which explain its strong low nanomolar affinity for this isoform and may also be exploited for the design of effective inhibitors incorporating sultam moieties.

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Organizational Affiliation: 

Università degli Studi di Firenze, Polo Scientifico, Laboratorio di Chimica Bioinorganica, Rm 188, Via della Lastruccia 3, 50019 Sesto Fiorentino (Florence), Italy.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29.85 kDa 
• Atom Count: 2,244 
• Modelled Residue Count: 257 
• Deposited Residue Count: 260 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carbonic anhydrase 2	A	260	N/A	Mutation(s): 0  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

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
OSP	D [auth A]	SULTHIAME C10 H14 N2 O4 S2 HMHVCUVYZFYAJI-UHFFFAOYSA-N
HG	C [auth A]	MERCURY (II) ION Hg BQPIGGFYSBELGY-UHFFFAOYSA-N
ZN	B [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
OSP	BindingDB:  2Q1Q	Ki: min: 9, max: 9000 (nM) from 2 assay(s)
	PDBBind:  2Q1Q	Ki: 7 (nM) from 1 assay(s)
	Binding MOAD:  2Q1Q	Ki: 7 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.251 
• R-Value Work: 0.197 
• R-Value Observed: 0.200 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.19	α = 90
b = 41.28	β = 104.29
c = 72.07	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
CrysalisPro	data collection
CrysalisPro	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-09-11 
Deposition Author(s): Temperini, C., Innocenti, A., Mastrolorenzo, A., Scozzafava, A., Supuran, C.T.

Revision History  

• Version 1.0: 2007-09-11
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-10-18
  Changes: Refinement description
• Version 1.3: 2018-04-04
  Changes: Data collection