Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29738.27 
• Atom Count: 2059 
• Residue Count: 260 
• Unique protein chains: 1

2HKK

Carbonic anhydrase activators: Solution and X-ray crystallography for the interaction of andrenaline with various carbonic anhydrase isoforms

• DOI: 10.2210/pdb2HKK/pdb

• Classification: LYASE
• Organism(s): Homo sapiens


• Deposited: 2006-07-05 Released: 2007-05-22 
• Deposition Author(s): Temperini, C., Innocenti, A., Vullo, D., Scozzafava, A., Supuran, C.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.233 
• R-Value Work: 0.186 

Literature

Carbonic anhydrase activators: L-Adrenaline plugs the active site entrance of isozyme II, activating better isoforms I, IV, VA, VII, and XIV.

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

(2007) Bioorg.Med.Chem.Lett. 17: 628-635

• PubMed: 17127057 
• DOI: 10.1016/j.bmcl.2006.11.027


• PubMed Abstract: 
  

The activation of the metalloenzyme carbonic anhydrase (CA, EC 4.2.1.1) with L-adrenaline and histamine has been investigated by kinetic and X-ray crystallographic studies. L-Adrenaline behaves as a potent activator of isozyme CA I (activation constant of 90 nM), being a much weaker activator of isozyme CA II (activation constant of 96 microM). Isoforms CA IV, VA, VII, and XIV were activated by L-adrenaline with K(A)s in the range of 36-63 microM. The X-ray crystal structure of the CA II-L-adrenaline adduct revealed that the activator plugs the entrance of the active site cavity, obstructing it almost completely.

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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.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Carbonic anhydrase 2	A	260	Homo sapiens	Mutation(s): 0  Gene Names: CA2 EC: 4.2.1.1
Find proteins for P00918 (Homo sapiens) Go to Gene View: CA2 Go to UniProtKB:  P00918

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ALE	A	L-EPINEPHRINE ADRENALINE C9 H13 N O3 UCTWMZQNUQWSLP-VIFPVBQESA-N
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
HG	A	MERCURY (II) ION Hg BQPIGGFYSBELGY-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
ALE	Ka: 96 M-1 BINDINGMOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.233 
• R-Value Work: 0.186 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 42.100	α = 90.00
b = 41.430	β = 104.48
c = 72.200	γ = 90.00

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-07-05 
• Released Date: 2007-05-22 
• Deposition Author(s): Temperini, C., Innocenti, A., Vullo, D., Scozzafava, A., Supuran, C.T.

Revision History 

• Version 1.0: 2007-05-22
  Type: Initial release
• Version 1.1: 2007-10-16
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2013-03-20
  Type: Non-polymer description
• Version 1.4: 2018-04-04
  Type: Data collection