4K0S | pdb_00004k0s

Structure of HCAIX mimic (HCAII with 5 mutations in active site) in complex with acetazolamide

• PDB DOI: https://doi.org/10.2210/pdb4K0S/pdb

• Classification: LYASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2013-04-04 Released: 2014-04-09 
• Deposition Author(s): Biswas, S., McKenna, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.213 (Depositor), 0.215 (DCC) 
• R-Value Work: 
  0.167 (Depositor), 0.174 (DCC) 
• R-Value Observed: 
  0.170 (Depositor) 

Starting Model: experimental

Literature

Developing isoform specific inhibitors against hCAIX using CAIX mimic

Biswas, S., West, D., Pinard, M., McKenna, R.

To be published.

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 29.19 kDa 
• Atom Count: 2,357 
• Modeled Residue Count: 257 
• Deposited Residue Count: 257 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carbonic anhydrase 2	A	257	Homo sapiens	Mutation(s): 5  Gene Names: CA2, hCAII EC: 4.2.1.1 (PDB Primary Data), 4.2.1.69 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens) Explore P00918  Go to UniProtKB:  P00918
PHAROS:  P00918 GTEx:  ENSG00000104267

Small Molecules

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

Binding Affinity Annotations
ID	Source	Binding Affinity
AZM	BindingDB:  4K0S	Ki: 25 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.213 (Depositor), 0.215 (DCC) 
• R-Value Work:  0.167 (Depositor), 0.174 (DCC) 
• R-Value Observed: 0.170 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.124	α = 90
b = 41.463	β = 103.89
c = 72.669	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-04-09 
Deposition Author(s): Biswas, S., McKenna, R.

Revision History  

• Version 1.0: 2014-04-09
  Type: Initial release
  
• Version 1.1: 2023-09-20
  Changes: Data collection, Database references, Derived calculations, Refinement description