2FW4

Carbonic anhydrase activators. The first X-ray crystallographic study of an activator of isoform I, structure with L-histidine.

• PDB DOI: https://doi.org/10.2210/pdb2FW4/pdb

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


• Deposited: 2006-02-01 Released: 2006-08-08 
• Deposition Author(s): Temperini, C., Scozzafava, A., Supuran, C.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.303 
• R-Value Work: 0.213 
• R-Value Observed: 0.217 

Literature

Carbonic anhydrase activators: The first X-ray crystallographic study of an adduct of isoform I.

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

(2006) Bioorg Med Chem Lett 16: 5152-5156

• PubMed: 16870440 
• DOI: https://doi.org/10.1016/j.bmcl.2006.07.021
• Primary Citation of Related Structures:  
  2FW4


• PubMed Abstract: 
  

  The X-ray crystallographic structure for the adduct of an activator with human carbonic anhydrase isozyme I (hCA I) is reported. L-Histidine binds deep within the enzyme active site, participating in a network of hydrogen bonds involving its carboxylate moiety and the zinc-bound water molecule, as well as the imidazole of His200, being in van der Waals contacts with Thr199, His200, His64, and His67. This binding is very different from that to the other major cytosolic isozyme hCA II.

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Organizational Affiliation: 

Università degli Studi di Firenze, Laboratorio di Chimica Bioinorganica, Rm. 188, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Firenze, Italy.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 57.99 kDa 
• Atom Count: 4,418 
• Modelled Residue Count: 513 
• Deposited Residue Count: 520 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carbonic anhydrase 1	A, B	260	Homo sapiens	Mutation(s): 0  EC: 4.2.1.1 (PDB Primary Data), 4.2.1.69 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P00915 (Homo sapiens) Explore P00915  Go to UniProtKB:  P00915
PHAROS:  P00915 GTEx:  ENSG00000133742

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HIS	D [auth A], F [auth B]	HISTIDINE C6 H10 N3 O2 HNDVDQJCIGZPNO-YFKPBYRVSA-O
ZN	C [auth A], E [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.303 
• R-Value Work: 0.213 
• R-Value Observed: 0.217 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.138	α = 90
b = 70.182	β = 90
c = 120.573	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-08-08 
Deposition Author(s): Temperini, C., Scozzafava, A., Supuran, C.T.

Revision History  

• Version 1.0: 2006-08-08
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-04-04
  Changes: Data collection
• Version 1.4: 2024-02-14
  Changes: Data collection, Database references, Derived calculations, Refinement description