1IF4

Carbonic Anhydrase II Complexed With 4-fluorobenzenesulfonamide

• PDB DOI: https://doi.org/10.2210/pdb1IF4/pdb

• Classification: LYASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2001-04-12 Released: 2001-05-02 
• Deposition Author(s): Kim, C.-Y., Christianson, D.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 0.296 
• R-Value Work: 0.219 

Starting Model: experimental

Literature

Binding of Fluorine Substituted Benzenesulfonamides to Carbonic Anhydrase II

Kim, C.-Y., Christianson, D.W.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29.6 kDa 
• Atom Count: 2,131 
• Modelled Residue Count: 258 
• Deposited Residue Count: 259 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carbonic Anhydrase II	A	259	Homo sapiens	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
GTEx:  ENSG00000104267

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HG	C [auth A]	MERCURY (II) ION Hg BQPIGGFYSBELGY-UHFFFAOYSA-N
FBS	D [auth A]	4-FLUOROBENZENESULFONAMIDE C6 H6 F N O2 S LFLSATHZMYYIAQ-UHFFFAOYSA-N
ZN	B [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
FBS	BindingDB:  1IF4	Kd: 435 (nM) from 1 assay(s)
		IC50: 203 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 0.296 
• R-Value Work: 0.219 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 43.3	α = 90
b = 42	β = 104.1
c = 73.6	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-05-02 
Deposition Author(s): Kim, C.-Y., Christianson, D.W.

Revision History  

• Version 1.0: 2001-05-02
  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
• Version 1.4: 2018-04-25
  Changes: Data collection, Derived calculations, Structure summary
• Version 1.5: 2023-08-16
  Changes: Data collection, Database references, Derived calculations, Refinement description