Structure of PDB 3caj Chain A Binding Site BS02

Receptor Information
>3caj Chain A (length=258) Species: 9606 (Homo sapiens) [Search protein sequence] [Download receptor structure] [Download structure with residue number starting from 1] [View receptor structure]
HHWGYGKHNGPEHWHKDFPIAKGERQSPVDIDTHTAKYDPSLKPLSVSYD
QATSLRILNNGHAFNVEFDDSQDKAVLKGGPLDGTYRLIQFHFHWGSLDG
QGSEHTVDKKKYAAELHLVHWNTKYGDFGKAVQQPDGLAVLGIFLKVGSA
KPGLQKVVDVLDSIKTKGKSADFTNFDPRGLLPESLDYWTYPGSLTTPPL
LECVTWIVLKEPISVSSEQVLKFRKLNFNGEGEPEELMVDNWRPAQPLKN
RQIKASFK
Ligand information
Ligand IDEZL
InChIInChI=1S/C9H10N2O3S2/c1-2-14-6-3-4-7-8(5-6)15-9(11-7)16(10,12)13/h3-5H,2H2,1H3,(H2,10,12,13)
InChIKeyOUZWUKMCLIBBOG-UHFFFAOYSA-N
SMILES
SoftwareSMILES
CACTVS 3.341CCOc1ccc2nc(sc2c1)[S](N)(=O)=O
ACDLabs 10.04O=S(=O)(c1nc2ccc(OCC)cc2s1)N
OpenEye OEToolkits 1.5.0CCOc1ccc2c(c1)sc(n2)S(=O)(=O)N
FormulaC9 H10 N2 O3 S2
Name6-ethoxy-1,3-benzothiazole-2-sulfonamide;
Ethoxzolamide
ChEMBLCHEMBL18
DrugBankDB00311
ZINCZINC000000056721
PDB chain3caj Chain A Residue 265 [Download ligand structure] [Download structure with residue number starting from 1] [View ligand structure]
Receptor-Ligand Complex Structure
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PDB3caj Carbonic anhydrase inhibitors: the X-ray crystal structure of ethoxzolamide complexed to human isoform II reveals the importance of thr200 and gln92 for obtaining tight-binding inhibitors
Resolution1.8 Å
Binding residue
(original residue number in PDB)		H94 H119 L198 T199 T200
Binding residue
(residue number reindexed from 1)		H92 H117 L195 T196 T197
Annotation score1
Binding affinityMOAD: Ki=8nM
PDBbind-CN: -logKd/Ki=8.10,Ki=8nM
BindingDB: Ki=8nM,IC50=3nM,Kd=0.71nM
Enzymatic activity
Catalytic site (original residue number in PDB) H64 H94 H96 E106 H119 T199
Catalytic site (residue number reindexed from 1) H62 H92 H94 E104 H117 T196
Enzyme Commision number 4.2.1.1: carbonic anhydrase.
4.2.1.69: cyanamide hydratase.
Gene Ontology
Molecular Function
GO:0004064 arylesterase activity
GO:0004089 carbonate dehydratase activity
GO:0005515 protein binding
GO:0008270 zinc ion binding
GO:0016829 lyase activity
GO:0018820 cyanamide hydratase activity
GO:0046872 metal ion binding
Biological Process
GO:0002009 morphogenesis of an epithelium
GO:0006730 one-carbon metabolic process
GO:0015670 carbon dioxide transport
GO:0032230 positive regulation of synaptic transmission, GABAergic
GO:0032849 positive regulation of cellular pH reduction
GO:0038166 angiotensin-activated signaling pathway
GO:0044070 regulation of monoatomic anion transport
GO:0046903 secretion
GO:0051453 regulation of intracellular pH
GO:0070050 neuron cellular homeostasis
GO:2001150 positive regulation of dipeptide transmembrane transport
GO:2001225 regulation of chloride transport
Cellular Component
GO:0005737 cytoplasm
GO:0005829 cytosol
GO:0005886 plasma membrane
GO:0043209 myelin sheath
GO:0045177 apical part of cell
GO:0070062 extracellular exosome

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Molecular Function
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Biological Process
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Cellular Component
External links
PDB RCSB:3caj, PDBe:3caj, PDBj:3caj
PDBsum3caj
PubMed18359629
UniProtP00918|CAH2_HUMAN Carbonic anhydrase 2 (Gene Name=CA2)

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