Structure of PDB 2h4n Chain A Binding Site BS03

Receptor Information
>2h4n Chain A (length=257) Species: 9606 (Homo sapiens) [Search protein sequence] [Download receptor structure] [Download structure with residue number starting from 1] [View receptor structure]
HWGYGKHNGPEHWHKDFPIAKGERQSPVDIDTHTAKYDPSLKPLSVSYDQ
ATSLRILNNGHAFNVEFDDSQDKAVLKGGPLDGTYRLIQFNFHWGSLDGQ
GSEHTVDKKKYAAELHLVHWNTKYGDFGKAVQQPDGLAVLGIFLKVGSAK
PGLQKVVDVLDSIKTKGKSADFTNFDPRGLLPESLDYWTYPGSLTTPPLL
ECVTWIVLKEPISVSSEQVLKFRKLNFNGEGEPEELMVDNWRPAQPLKNR
QIKASFK
Ligand information
Ligand IDAZM
InChIInChI=1S/C4H6N4O3S2/c1-2(9)6-3-7-8-4(12-3)13(5,10)11/h1H3,(H2,5,10,11)(H,6,7,9)
InChIKeyBZKPWHYZMXOIDC-UHFFFAOYSA-N
SMILES
SoftwareSMILES
OpenEye OEToolkits 1.5.0CC(=O)Nc1nnc(s1)S(=O)(=O)N
CACTVS 3.341CC(=O)Nc1sc(nn1)[S](N)(=O)=O
ACDLabs 10.04O=S(=O)(c1nnc(s1)NC(=O)C)N
FormulaC4 H6 N4 O3 S2
Name5-ACETAMIDO-1,3,4-THIADIAZOLE-2-SULFONAMIDE
ChEMBLCHEMBL20
DrugBankDB00819
ZINCZINC000003813042
PDB chain2h4n Chain A Residue 264 [Download ligand structure] [Download structure with residue number starting from 1] [View ligand structure]
Receptor-Ligand Complex Structure
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PDB2h4n Histidine --> carboxamide ligand substitutions in the zinc binding site of carbonic anhydrase II alter metal coordination geometry but retain catalytic activity.
Resolution1.9 Å
Binding residue
(original residue number in PDB)		Q92 N94 H96 H119 V121 F131 T199 T200
Binding residue
(residue number reindexed from 1)		Q89 N91 H93 H116 V118 F127 T195 T196
Annotation score1
Binding affinityMOAD: Kd=0.002nM
PDBbind-CN: -logKd/Ki=8.70,Kd=2nM
BindingDB: Ki=12nM,Kd=17nM,IC50=10nM
Enzymatic activity
Catalytic site (original residue number in PDB) H64 N94 H96 E106 H119 T199
Catalytic site (residue number reindexed from 1) H61 N91 H93 E103 H116 T195
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:2h4n, PDBe:2h4n, PDBj:2h4n
PDBsum2h4n
PubMed9398308
UniProtP00918|CAH2_HUMAN Carbonic anhydrase 2 (Gene Name=CA2)

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