ISDA

Deposition Date 2006-05-16

Release Date 2007-03-27

Last Version Date 2024-02-14

Entry Detail

PDB ID:

2H15

Keywords:

LYASE

Title:

Carbonic anhydrase inhibitors: Clashing with Ala65 as a means of designing isozyme-selective inhibitors that show low affinity for the ubiquitous isozyme II

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.90 Å

R-Value Free:

0.22

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 1 21 1

Download Validation Report

Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Carbonic anhydrase 2
Gene (Uniprot):CA2
Chain IDs:A
Chain Length:260
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P00918 Pfam ID:PF00194 EC:4.2.1.1

Ligand Molecules

B19

Primary Citation

Carbonic anhydrase inhibitors: clash with Ala65 as a means for designing inhibitors with low affinity for the ubiquitous isozyme II, exemplified by the crystal structure of the topiramate sulfamide analogue.

Winum, J.Y, Temperini, C, El Cheikh, K, Innocenti, A, Vullo, D, Ciattini, S, Montero, J.L, Scozzafava, A, Supuran, C.T.Show

J.Med.Chem. 49 7024 7031 (2006)

PMID: 17125255 DOI: 10.1021/jm060807n

Abstact

The sulfamide analogue of the antiepileptic drug topiramate is a 210 times less potent inhibitor of isozyme II of the zinc enzyme carbonic anhydrase (CA, EC 4.2.1.1) compared to topiramate but effectively inhibits isozymes CA VA, VB, VII, XIII, and XIV (KI in the range of 21-35 nM). Its weak binding to CA II is due to a clash between one methyl group of the inhibitor and Ala65 and may be exploited for the drug design of compounds with lower affinity for this ubiquitous isozyme, as Ala65 is unique to CA II. As shown by X-ray crystallography, the sulfamide analogue binds to CA II with the deprotonated sulfamide moiety coordinated to Zn(II) and with the organic scaffold making an extended network of hydrogen bonds with Thr199, Gln92, His94, Asn62, and Thr200. Its binding to this isozyme is more similar to that of topiramate and quite different from that of the topiramate cyclic sulfate analogue RWJ-37947.

Legend

Protein

Chemical

Disease

Primary Citation of related structures