Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 59.92 kDa 
• Atom Count: 4609 
• Residue Count: 516 
• Unique protein chains: 1

3CZV

Crystal structure of the human carbonic anhydrase XIII in complex with acetazolamide

• DOI: 10.2210/pdb3CZV/pdb

• Classification: LYASE
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2008-04-30 Released: 2008-07-29 
• Deposition Author(s): Di Fiore, A., De Simone, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.217 
• R-Value Work: 0.178 

Literature

Crystal structure of human carbonic anhydrase XIII and its complex with the inhibitor acetazolamide.

Di Fiore, A., Monti, S.M., Hilvo, M., Parkkila, S., Romano, V., Scaloni, A., Pedone, C., Scozzafava, A., Supuran, C.T., De Simone, G.

(2008) Proteins 74: 164-175

• PubMed: 18618712 
• DOI: 10.1002/prot.22144
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The cytosolic isoform XIII is a recently discovered member of the human carbonic anhydrase (hCA, EC 4.2.1.1) family. It is selectively expressed among other tissues in the reproductive organs, where it may control pH and ion balance regulation, ensuring thus proper fertilization conditions. The authors report here the X-ray crystallographic structure of this isozyme in the unbound state and in complex with a classical sulfonamide inhibitor, namely acetazolamide. A detailed comparison of the obtained structural data with those already reported for other CA isozymes provides novel insights into the catalytic properties of the members of this protein family. On the basis of the inhibitory properties of acetazolamide against various cytosolic/transmembrane isoforms and the structural differences detected within the active site of the various CA isoforms, further prospects for the design of isozyme-specific CA inhibitors are here proposed.

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Related Citations: 

• Refined structure of human carbonic anhydrase II at 2.0 A resolution
  Eriksson, A.E., Jones, T.A., Liljas, A.
  (1988) Proteins 4: 274

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Organizational Affiliation: 

Istituto di Biostrutture e Bioimmagini-CNR, 80134 Naples, Italy.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Carbonic anhydrase 13	A, B	264	Homo sapiens	Mutation(s): 0  Gene Names: CA13 EC: 4.2.1.1
Find proteins for Q8N1Q1 (Homo sapiens) Go to UniProtKB:  Q8N1Q1
NIH Common Fund Data Resources
PHAROS  Q8N1Q1 GTEx  ENSG00000185015

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AZM	A, B	5-ACETAMIDO-1,3,4-THIADIAZOLE-2-SULFONAMIDE C4 H6 N4 O3 S2 BZKPWHYZMXOIDC-UHFFFAOYSA-N
GOL	B	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN	A, B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
AZM	Ki:  16   nM  Binding MOAD
AZM	Ki :  16   nM  PDBBind

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.217 
• R-Value Work: 0.178 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.03	α = 90
b = 81.567	β = 90
c = 112.374	γ = 90

Software Package:

Software Name	Purpose
CrystalClear	data collection
AMoRE	phasing
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-04-30 
• Released Date: 2008-07-29 
Deposition Author(s): Di Fiore, A., De Simone, G.

Revision History 

• Version 1.0: 2008-07-29
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Non-polymer description, Version format compliance