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Version 2.5
Creation Date 2005-06-13 13:24:05
Update Date 2009-06-23 18:06:30
Primary Accession Number DB00342
Secondary Accession Number
  • APRD00606
Name Terfenadine
Drug Type
  • Approved
  • Small Molecule
  • Withdrawn
Description In the U.S., Terfenadine was superseded by fexofenadine in the 1990s due to the risk of cardiac arrhythmia caused by QT interval prolongation.
Synonyms
  1. Ternadin
Brand Names
  1. Aldaban
  2. Allerplus
  3. Cyater
  4. Seldane
  5. Teldane
  6. Teldanex
  7. Terdin
  8. Terfex
  9. Triludan
Brand Mixtures Not Available
Chemical IUPAC Name 1-(4-tert-butylphenyl)-4-[4-[hydroxy-di(phenyl)methyl]piperidin-1-yl]butan-1-ol
Chemical Formula C32H41NO2
Chemical Structure Structure
CAS Registry Number 50679-08-8
InChI Identifier InChI=1/C32H41NO2/c1-31(2,3)26-18-16-25(17-19-26)30(34)15-10-22-33-23-20-29(21-24-33)32(35,27-11-6-4-7-12-27)28-13-8-5-9-14-28/h4-9,11-14,16-19,29-30,34-35H,10,15,20-24H2,1-3H3
InChI Key GUGOEEXESWIERI-UHFFFAOYAL
KEGG Drug D00521 Link Image
KEGG Compound C07463 Link Image
PubChem Compound 5405 Link Image
PubChem Substance 180732 Link Image
ChEBI ID Not Available
PharmGKB ID Not Available
HET ID Not Available
GenBank ID Not Available
Drug ID Number [DIN] 01913395 Link Image
RxList Link http://www.rxlist.com/cgi/generic/terfen.htm Link Image
PDRhealth Link Not Available
Wikipedia Link http://en.wikipedia.org/wiki/Terfenadine Link Image
FDA Label Not Available
Material Safety Data Sheet (MSDS)
Synthesis Reference A. A. Carr, C. R. Kinsolving, U.S. Pat. 3,878,217 (1975)
Average Molecular Weight 471.6734
Monoisotopic Molecular Weight 471.3137
State Solid
Melting Point 146.5-148.5oC
Experimental Water Solubility 10 mg/L Source: PhysProp
Predicted Water Solubility 4.58e-04 mg/mL Calculated using ALOGPS
Experimental LogP/Hydrophobicity 7.1 Source: PhysProp
Predicted LogP 5.89 Calculated using ALOGPS
Experimental LogS Not Available
Predicted LogS -6.01 Calculated using ALOGPS
Experimental Caco2 Permeability Not Available
pKa/Isoelectric Point Not Available
Mass Spectrum Not Available
MOL File Show Link Image | Download Link Image
SDF File Show Link Image | Download Link Image
PDB File Show Link Image | Download Link Image
2D Structure
3D Structure
Experimental PDB ID Not Available
Isomeric SMILES CC(C)(C)C1=CC=C(C=C1)[C@H](O)CCCN1CCC(CC1)C(O)(C1=CC=CC=C1)C1=CC=CC=C1
Canonical SMILES CC(C)(C)C1=CC=C(C=C1)C(O)CCCN1CCC(CC1)C(O)(C1=CC=CC=C1)C1=CC=CC=C1
Drug Category
  • Anti-Allergic Agents
  • Antiarrhythmic Agents
  • Antihistamines
  • Histamine H1 Antagonists, Non-Sedating
ATC Codes
AHFS Codes Not Available
Indication For the treatment of allergic rhinitis, hay fever, and allergic skin disorders.
Pharmacology Terfenadine, an H1-receptor antagonist antihistamine, is similar in structure to astemizole and haloperidol, a butyrophenone antipsychotic. The active metabolite of terfenadine is fexofenadine.
Mechanism of Action Terfenadine competes with histamine for binding at H1-receptor sites in the GI tract, uterus, large blood vessels, and bronchial muscle. This reversible binding of terfenadine to H1-receptors suppresses the formation of edema, flare, and pruritus resulting from histaminic activity. As the drug does not readily cross the blood-brain barrier, CNS depression is minimal.
Absorption On the basis of a mass balance study using 14C labeled terfenadine the oral absorption of terfenadine was estimated to be at least 70%
Toxicity Mild (e.g., headache, nausea, confusion), but adverse cardiac events including cardiac arrest, ventricular arrhythmias including torsades de pointes and QT prolongation have been reported. LD50=mg/kg (orally in mice)
Protein Binding 70%
Biotransformation Hepatic
Half Life 3.5 hours
Dosage Forms
Form Route
Tablet Oral
Patient Information Show Link Image
Contraindications Show Link Image
Interactions Show Link Image
Drug Interactions
Drug Interaction
Acetophenazine Increased risk of cardiotoxicity and arrhythmias
Amiodarone Increased risk of cardiotoxicity and arrhythmias
Amitriptyline Increased risk of cardiotoxicity and arrhythmias
Amoxapine Increased risk of cardiotoxicity and arrhythmias
Amprenavir Increased risk of cardiotoxicity and arrhythmias
Aprepitant Increased risk of cardiotoxicity and arrhythmias
Bepridil Increased risk of cardiotoxicity and arrhythmias
Chlorpromazine Increased risk of cardiotoxicity and arrhythmias
Cimetidine Increased risk of cardiotoxicity and arrhythmias
Cisapride Increased risk of cardiotoxicity and arrhythmias
Clarithromycin Increased risk of cardiotoxicity and arrhythmias
Clomipramine Increased risk of cardiotoxicity and arrhythmias
Delavirdine Increased risk of cardiotoxicity and arrhythmias
Desipramine Increased risk of cardiotoxicity and arrhythmias
Diltiazem Increased risk of cardiotoxicity and arrhythmias
Disopyramide Increased risk of cardiotoxicity and arrhythmias
Doxepin Increased risk of cardiotoxicity and arrhythmias
Efavirenz Increased risk of cardiotoxicity and arrhythmias
Erythromycin Increased risk of cardiotoxicity and arrhythmias
Flecainide Increased risk of cardiotoxicity and arrhythmias
Fluconazole Increased risk of cardiotoxicity and arrhythmias
Fluoxetine Increased risk of cardiotoxicity and arrhythmias
Fluphenazine Increased risk of cardiotoxicity and arrhythmias
Fluvoxamine Increased risk of cardiotoxicity and arrhythmias
Fosamprenavir Increased risk of cardiotoxicity and arrhythmias
Grepafloxacin Increased risk of cardiotoxicity and arrhythmias
Imipramine Increased risk of cardiotoxicity and arrhythmias
Indinavir Increased risk of cardiotoxicity and arrhythmias
Itraconazole Increased risk of cardiotoxicity and arrhythmias
Josamycin Increased risk of cardiotoxicity and arrhythmias
Ketoconazole Increased risk of cardiotoxicity and arrhythmias
Mesoridazine Increased risk of cardiotoxicity and arrhythmias
Methdilazine Increased risk of cardiotoxicity and arrhythmias
Methotrimeprazine Increased risk of cardiotoxicity and arrhythmias
Mexiletine Increased risk of cardiotoxicity and arrhythmias
Mibefradil Increased risk of cardiotoxicity and arrhythmias
Nefazodone Increased risk of cardiotoxicity and arrhythmias
Nelfinavir Increased risk of cardiotoxicity and arrhythmias
Nicardipine Increased risk of cardiotoxicity and arrhythmias
Nortriptyline Increased risk of cardiotoxicity and arrhythmias
Perphenazine Increased risk of cardiotoxicity and arrhythmias
Posaconazole Contraindicated co-administration
Procainamide Increased risk of cardiotoxicity and arrhythmias
Prochlorperazine Increased risk of cardiotoxicity and arrhythmias
Promazine Increased risk of cardiotoxicity and arrhythmias
Promethazine Increased risk of cardiotoxicity and arrhythmias
Propafenone Increased risk of cardiotoxicity and arrhythmias
Propericiazine Increased risk of cardiotoxicity and arrhythmias
Propiomazine Increased risk of cardiotoxicity and arrhythmias
Protriptyline Increased risk of cardiotoxicity and arrhythmias
Quinidine Increased risk of cardiotoxicity and arrhythmias
Quinine Increased risk of cardiotoxicity and arrhythmias
Quinupristin This combination presents an increased risk of toxicity
Ritonavir Increased risk of cardiotoxicity and arrhythmias
Saquinavir Increased risk of cardiotoxicity and arrhythmias
Sotalol Increased risk of cardiotoxicity and arrhythmias
Sparfloxacin Increased risk of cardiotoxicity and arrhythmias
Telithromycin Increased risk of cardiotoxicity and arrhythmias
Thiethylperazine Increased risk of cardiotoxicity and arrhythmias
Thioridazine Increased risk of cardiotoxicity and arrhythmias
Tocainide Increased risk of cardiotoxicity and arrhythmias
Trifluoperazine Increased risk of cardiotoxicity and arrhythmias
Triflupromazine Increased risk of cardiotoxicity and arrhythmias
Trimeprazine Increased risk of cardiotoxicity and arrhythmias
Trimipramine Increased risk of cardiotoxicity and arrhythmias
Troleandomycin Increased risk of cardiotoxicity and arrhythmias
Verapamil Increased risk of cardiotoxicity and arrhythmias
Voriconazole Increased risk of cardiotoxicity and arrhythmias
Food Interactions Not Available
Pathways Not Available
General References
  1. Drugs.com Link Image
  2. Wikipedia Link Image
  3. RxList Link Image
Organisms Affected
  • Humans and other mammals
Phase 1 Metabolizing Enzymes
  1. Cytochrome P450 2C19 (CYP2C19)
  2. Cytochrome P450 3A4 (CYP3A4)
  3. Cytochrome P450 1A2 (CYP1A2)
  4. Cytochrome P450 2C9 (CYP2C9)
  5. Cytochrome P450 2D6 (CYP2D6)
Targets
  1. Potassium voltage-gated channel subfamily H member 2
  2. Histamine H1 receptor
Phase 1 Metabolizing Enzyme 1 [top]
Enzyme 1 Name Cytochrome P450 2C19 (CYP2C19)
Enzyme 1 Gene Name CYP2C19
Enzyme 1 SwissProt ID P33261 Link Image
Enzyme 1 SNPs SNPJam Report Link Image
Enzyme 1 Protein Sequence >sp|P33261|CP2CJ_HUMAN Cytochrome P450 2C19 (EC 1.14.13.80) 
MDPFVVLVLCLSCLLLLSIWRQSSGRGKLPPGPTPLPVIGNILQIDIKDVSKSLTNLSKI
YGPVFTLYFGLERMVVLHGYEVVKEALIDLGEEFSGRGHFPLAERANRGFGIVFSNGKRW
KEIRRFSLMTLRNFGMGKRSIEDRVQEEARCLVEELRKTKASPCDPTFILGCAPCNVICS
IIFQKRFDYKDQQFLNLMEKLNENIRIVSTPWIQICNNFPTIIDYFPGTHNKLLKNLAFM
ESDILEKVKEHQESMDINNPRDFIDCFLIKMEKEKQNQQSEFTIENLVITAADLLGAGTE
TTSTTLRYALLLLLKHPEVTAKVQEEIERVVGRNRSPCMQDRGHMPYTDAVVHEVQRYID
LIPTSLPHAVTCDVKFRNYLIPKGTTILTSLTSVLHDNKEFPNPEMFDPRHFLDEGGNFK
KSNYFMPFSAGKRICVGEGLARMELFLFLTFILQNFNLKSLIDPKDLDTTPVVNGFASVP
PFYQLCFIPV
Phase 1 Metabolizing Enzyme 2 [top]
Enzyme 2 Name Cytochrome P450 3A4 (CYP3A4)
Enzyme 2 Gene Name CYP3A4
Enzyme 2 SwissProt ID P08684 Link Image
Enzyme 2 SNPs SNPJam Report Link Image
Enzyme 2 Protein Sequence >sp|P08684|CP3A4_HUMAN Cytochrome P450 3A4 (EC 1.14.13.67) 
ALIPDLAMETWLLLAVSLVLLYLYGTHSHGLFKKLGIPGPTPLPFLGNILSYHKGFCMFD
MECHKKYGKVWGFYDGQQPVLAITDPDMIKTVLVKECYSVFTNRRPFGPVGFMKSAISIA
EDEEWKRLRSLLSPTFTSGKLKEMVPIIAQYGDVLVRNLRREAETGKPVTLKDVFGAYSM
DVITSTSFGVNIDSLNNPQDPFVENTKKLLRFDFLDPFFLSITVFPFLIPILEVLNICVF
PREVTNFLRKSVKRMKESRLEDTQKHRVDFLQLMIDSQNSKETESHKALSDLELVAQSII
FIFAGYETTSSVLSFIMYELATHPDVQQKLQEEIDAVLPNKAPPTYDTVLQMEYLDMVVN
ETLRLFPIAMRLERVCKKDVEINGMFIPKGWVVMIPSYALHRDPKYWTEPEKFLPERFSK
KNKDNIDPYIYTPFGSGPRNCIGMRFALMNMKLALIRVLQNFSFKPCKETQIPLKLSLGG
LLQPEKPVVLKVESRDGTVSGA
Phase 1 Metabolizing Enzyme 3 [top]
Enzyme 3 Name Cytochrome P450 1A2 (CYP1A2)
Enzyme 3 Gene Name CYP1A2
Enzyme 3 SwissProt ID P05177 Link Image
Enzyme 3 SNPs SNPJam Report Link Image
Enzyme 3 Protein Sequence >P05177|CP1A2_HUMAN Cytochrome P450 1A2 - Homo sapiens (Human). 
MALSQSVPFSATELLLASAIFCLVFWVLKGLRPRVPKGLKSPPEPWGWPLLGHVLTLGKN
PHLALSRMSQRYGDVLQIRIGSTPVLVLSRLDTIRQALVRQGDDFKGRPDLYTSTLITDG
QSLTFSTDSGPVWAARRRLAQNALNTFSIASDPASSSSCYLEEHVSKEAKALISRLQELM
AGPGHFDPYNQVVVSVANVIGAMCFGQHFPESSDEMLSLVKNTHEFVETASSGNPLDFFP
ILRYLPNPALQRFKAFNQRFLWFLQKTVQEHYQDFDKNSVRDITGALFKHSKKGPRASGN
LIPQEKIVNLVNDIFGAGFDTVTTAISWSLMYLVTKPEIQRKIQKELDTVIGRERRPRLS
DRPQLPYLEAFILETFRHSSFLPFTIPHSTTRDTTLNGFYIPKKCCVFVNQWQVNHDPEL
WEDPSEFRPERFLTADGTAINKPLSEKMMLFGMGKRRCIGEVLAKWEIFLFLAILLQQLE
FSVPPGVKVDLTPIYGLTMKHARCEHVQARRFSIN
Phase 1 Metabolizing Enzyme 4 [top]
Enzyme 4 Name Cytochrome P450 2C9 (CYP2C9)
Enzyme 4 Gene Name CYP2C9
Enzyme 4 SwissProt ID P11712 Link Image
Enzyme 4 SNPs SNPJam Report Link Image
Enzyme 4 Protein Sequence >sp|P11712|CP2C9_HUMAN Cytochrome P450 2C9 (EC 1.14.13.80) 
MDSLVVLVLCLSCLLLLSLWRQSSGRGKLPPGPTPLPVIGNILQIGIKDISKSLTNLSKV
YGPVFTLYFGLKPIVVLHGYEAVKEALIDLGEEFSGRGIFPLAERANRGFGIVFSNGKKW
KEIRRFSLMTLRNFGMGKRSIEDRVQEEARCLVEELRKTKASPCDPTFILGCAPCNVICS
IIFHKRFDYKDQQFLNLMEKLNENIKILSSPWIQICNNFSPIIDYFPGTHNKLLKNVAFM
KSYILEKVKEHQESMDMNNPQDFIDCFLMKMEKEKHNQPSEFTIESLENTAVDLFGAGTE
TTSTTLRYALLLLLKHPEVTAKVQEEIERVIGRNRSPCMQDRSHMPYTDAVVHEVQRYID
LLPTSLPHAVTCDIKFRNYLIPKGTTILISLTSVLHDNKEFPNPEMFDPHHFLDEGGNFK
KSKYFMPFSAGKRICVGEALAGMELFLFLTSILQNFNLKSLVDPKNLDTTPVVNGFASVP
PFYQLCFIPV
Phase 1 Metabolizing Enzyme 5 [top]
Enzyme 5 Name Cytochrome P450 2D6 (CYP2D6)
Enzyme 5 Gene Name CYP2D6
Enzyme 5 SwissProt ID P10635 Link Image
Enzyme 5 SNPs SNPJam Report Link Image
Enzyme 5 Protein Sequence >sp|P10635|CP2D6_HUMAN Cytochrome P450 2D6 (EC 1.14.14.1) 
MGLEALVPLAVIVAIFLLLVDLMHRRQRWAARYPPGPLPLPGLGNLLHVDFQNTPYCFDQ
LRRRFGDVFSLQLAWTPVVVLNGLAAVREALVTHGEDTADRPPVPITQILGFGPRSQGVF
LARYGPAWREQRRFSVSTLRNLGLGKKSLEQWVTEEAACLCAAFANHSGRPFRPNGLLDK
AVSNVIASLTCGRRFEYDDPRFLRLLDLAQEGLKEESGFLREVLNAVPVLLHIPALAGKV
LRFQKAFLTQLDELLTEHRMTWDPAQPPRDLTEAFLAEMEKAKGNPESSFNDENLRIVVA
DLFSAGMVTTSTTLAWGLLLMILHPDVQRRVQQEIDDVIGQVRRPEMGDQAHMPYTTAVI
HEVQRFGDIVPLGMTHMTSRDIEVQGFRIPKGTTLITNLSSVLKDEAVWEKPFRFHPEHF
LDAQGHFVKPEAFLPFSAGRRACLGEPLARMELFLFFTSLLQHFSFSVPTGQPRPSHHGV
FAFLVSPSPYELCAVPR
Drug Target 1 [top]
Target 1 ID 101
Target 1 Name Potassium voltage-gated channel subfamily H member 2
Target 1 Synonyms
  1. Eag-related protein 1
  2. Erg1
  3. Ether-a-go-go-related gene potassium channel 1
  4. Ether-a-go-go-related protein 1
  5. H-ERG
  6. Voltage-gated potassium channel subunit Kv11.1
  7. eag homolog
Target 1 Gene Name KCNH2
Target 1 Protein Sequence >Potassium voltage-gated channel subfamily H member 2 
MPVRRGHVAPQNTFLDTIIRKFEGQSRKFIIANARVENCAVIYCNDGFCELCGYSRAEVM
QRPCTCDFLHGPRTQRRAAAQIAQALLGAEERKVEIAFYRKDGSCFLCLVDVVPVKNEDG
AVIMFILNFEVVMEKDMVGSPAHDTNHRGPPTSWLAPGRAKTFRLKLPALLALTARESSV
RSGGAGGAGAPGAVVVDVDLTPAAPSSESLALDEVTAMDNHVAGLGPAEERRALVGPGSP
PRSAPGQLPSPRAHSLNPDASGSSCSLARTRSRESCASVRRASSADDIEAMRAGVLPPPP
RHASTGAMHPLRSGLLNSTSDSDLVRYRTISKIPQITLNFVDLKGDPFLASPTSDREIIA
PKIKERTHNVTEKVTQVLSLGADVLPEYKLQAPRIHRWTILHYSPFKAVWDWLILLLVIY
TAVFTPYSAAFLLKETEEGPPATECGYACQPLAVVDLIVDIMFIVDILINFRTTYVNANE
EVVSHPGRIAVHYFKGWFLIDMVAAIPFDLLIFGSGSEELIGLLKTARLLRLVRVARKLD
RYSEYGAAVLFLLMCTFALIAHWLACIWYAIGNMEQPHMDSRIGWLHNLGDQIGKPYNSS
GLGGPSIKDKYVTALYFTFSSLTSVGFGNVSPNTNSEKIFSICVMLIGSLMYASIFGNVS
AIIQRLYSGTARYHTQMLRVREFIRFHQIPNPLRQRLEEYFQHAWSYTNGIDMNAVLKGF
PECLQADICLHLNRSLLQHCKPFRGATKGCLRALAMKFKTTHAPPGDTLVHAGDLLTALY
FISRGSIEILRGDVVVAILGKNDIFGEPLNLYARPGKSNGDVRALTYCDLHKIHRDDLLE
VLDMYPEFSDHFWSSLEITFNLRDTNMIPGSPGSTELEGGFSRQRKRKLSFRRRTDKDTE
QPGEVSALGPGRAGAGPSSRGRPGGPWGESPSSGPSSPESSEDEGPGRSSSPLRLVPFSS
PRPPGEPPGGEPLMEDCEKSSDTCNPLSGAFSGVSNIFSFWGDSRGRQYQELPRCPAPTP
SLLNIPLSSPGRRPRGDVESRLDALQRQLNRLETRLSADMATVLQLLQRQMTLVPPAYSA
VTTPGPGPTSTSPLLPVSPLPTLTLDSLSQVSQFMACEELPPGAPELPQEGPTRRLSLPG
QLGALTSQPLHRHGSDPGS
Target 1 Number of Residues 1178
Target 1 Molecular Weight 126656
Target 1 Theoretical pI 7.97
Target 1 GO Classification
Function
catalytic activity
transferase activity
transferase activity, transferring phosphorus-containing groups
kinase activity
protein kinase activity
protein histidine kinase activity
two-component sensor molecule activity
signal transducer activity
transporter activity
ion transporter activity
ion channel activity
voltage-gated ion channel activity
voltage-gated potassium channel activity
Process
two-component signal transduction system (phosphorelay)
cellular process
cell communication
signal transduction
regulation of biological process
regulation of physiological process
regulation of metabolism
regulation of cellular metabolism
regulation of nucleobase, nucleoside, nucleotide and nucleic acid metabolism
regulation of transcription
regulation of transcription, DNA-dependent
physiological process
cellular physiological process
transport
ion transport
cation transport
monovalent inorganic cation transport
potassium ion transport
Component
cell
membrane
Target 1 General Function Voltage-gated signal transduction
Target 1 Specific Function Pore-forming (alpha) subunit of voltage-gated inwardly rectifying potassium channel. Channel properties are modulated by cAMP and subunit assembly. Mediates the rapidly activating component of the delayed rectifying potassium current in heart (IKr). Isoform 3 has no channel activity by itself, but modulates channel characteristics when associated with isoform 1
Target 1 Pathways Not Available
Target 1 Reactions Not Available
Target 1 Pfam Domain Function
Target 1 Signals
  • None
Target 1 Transmembrane Regions
  • 404-424
  • 451-471
  • 496-516
  • 521-541
  • 548-568
  • 639-659
Target 1 Essentiality Non-Essential
Target 1 GenBank ID Protein 487738 Link Image
Target 1 UniProtKB/Swiss-Prot ID Q12809 Link Image
Target 1 UniProtKB/Swiss-Prot Entry Name KCNH2_HUMAN Link Image
Target 1 PDB ID 1BYW Link Image
Target 1 PDB File Show
Target 1 3D Structure
Target 1 Cellular Location
  • Membrane
  • multi-pass membrane protein
Target 1 Gene Sequence >3480 bp 
ATGCCGGTGCGGAGGGGCCACGTCGCGCCGCAGAACACCTTCCTGGACACCATCATCCGC
AAGTTTGAGGGCCAGAGCCGTAAGTTCATCATCGCCAACGCTCGGGTGGAGAACTGCGCC
GTCATCTACTGCAACGACGGCTTCTGCGAGCTGTGCGGCTACTCGCGGGCCGAGGTGATG
CAGCGACCCTGCACCTGCGACTTCCTGCACGGGCCGCGCACGCAGCGCCGCGCTGCCGCG
CAGATCGCGCAGGCACTGCTGGGCGCCGAGGAGCGCAAAGTGGAAATCGCCTTCTACCGG
AAAGATGGGAGCTGCTTCCTATGTCTGGTGGATGTGGTGCCCGTGAAGAACGAGGATGGG
GCTGTCATCATGTTCATCCTCAATTTCGAGGTGGTGATGGAGAAGGACATGGTGGGGTCC
CCGGCTCATGACACCAACCACCGGGGCCCCCCCACCAGCTGGCTGGCCCCAGGCCGCGCC
AAGACCTTCCGCCTGAAGCTGCCCGCGCTGCTGGCGCTGACGGCCCGGGAGTCGTCGGTG
CGGTCGGGCGGCGCGGGCGGCGCGGGCGCCCCGGGGGCCGTGGTGGTGGACGTGGACCTG
ACGCCCGCGGCACCCAGCAGCGAGTCGCTGGCCCTGGACGAAGTGACAGCCATGGACAAC
CACGTGGCAGGGCTCGGGCCCGCGGAGGAGCGGCGTGCGCTGGTGGGTCCCGGCTCTCCG
CCCCGCAGCGCGCCCGGCCAGCTCCCATCGCCCCGGGCGCACAGCCTCAACCCCGACGCC
TCGGGCTCCAGCTGCAGCCTGGCCCGGACGCGCTCCCGAGAAAGCTGCGCCAGCGTGCGC
CGCGCCTCGTCGGCCGACGACATCGAGGCCATGCGCGCCGGGGTGCTGCCCCCGCCACCG
CGCCACGCCAGCACCGGGGCCATGCACCCACTGCGCAGCGGCTTGCTCAACTCCACCTCG
GACTCCGACCTCGTGCGCTACCGCACCATTAGCAAGATTCCCCAAATCACCCTCAACTTT
GTGGACCTCAAGGGCGACCCCTTCTTGGCTTCGCCCACCAGTGACCGTGAGATCATAGCA
CCTAAGATAAAGGAGCGAACCCACAATGTCACTGAGAAGGTCACCCAGGTCCTGTCCCTG
GGCGCCGACGTGCTGCCTGAGTACAAGCTGCAGGCACCGCGCATCCACCGCTGGACCATC
CTGCATTACAGCCCCTTCAAGGCCGTGTGGGACTGGCTCATCCTGCTGCTGGTCATCTAC
ACGGCTGTCTTCACACCCTACTCGGCTGCCTTCCTGCTGAAGGAGACGGAAGAAGGCCCG
CCTGCTACCGAGTGTGGCTACGCCTGCCAGCCGCTGGCTGTGGTGGACCTCATCGTGGAC
ATCATGTTCATTGTGGACATCCTCATCAACTTCCGCACCACCTACGTCAATGCCAACGAG
GAGGTGGTCAGCCACCCCGGCCGCATCGCCGTCCACTACTTCAAGGGCTGGTTCCTCATC
GACATGGTGGCCGCCATCCCCTTCGACCTGCTCATCTTCGGCTCTGGCTCTGAGGAGCTG
ATCGGGCTGCTGAAGACTGCGCGGCTGCTGCGGCTGGTGCGCGTGGCGCGGAAGCTGGAT
CGCTACTCAGAGTACGGCGCGGCCGTGCTGTTCTTGCTCATGTGCACCTTTGCGCTCATC
GCGCACTGGCTAGCCTGCATCTGGTACGCCATCGGCAACATGGAGCAGCCACACATGGAC
TCACGCATCGGCTGGCTGCACAACCTGGGCGACCAGATAGGCAAACCCTACAACAGCAGC
GGCCTGGGCGGCCCCTCCATCAAGGACAAGTATGTGACGGCGCTCTACTTCACCTTCAGC
AGCCTCACCAGTGTGGGCTTCGGCAACGTCTCTCCCAACACCAACTCAGAGAAGATCTTC
TCCATCTGCGTCATGCTCATTGGCTCCCTCATGTATGCTAGCATCTTCGGCAACGTGTCG
GCCATCATCCAGCGGCTGTACTCGGGCACAGCCCGCTACCACACACAGATGCTGCGGGTG
CGGGAGTTCATCCGCTTCCACCAGATCCCCAATCCCCTGCGCCAGCGCCTCGAGGAGTAC
TTCCAGCACGCCTGGTCCTACACCAACGGCATCGACATGAACGCGGTGCTGAAGGGCTTC
CCTGAGTGCCTGCAGGCTGACATCTGCCTGCACCTGAACCGCTCACTGCTGCAGCACTGC
AAACCCTTCCGAGGGGCCACCAAGGGCTGCCTTCGGGCCCTGGCCATGAAGTTCAAGACC
ACACATGCACCGCCAGGGGACACACTGGTGCATGCTGGGGACCTGCTCACCGCCCTGTAC
TTCATCTCCCGGGGCTCCATCGAGATCCTGCGGGGCGACGTCGTCGTGGCCATCCTGGGG
AAGAATGACATCTTTGGGGAGCCTCTGAACCTGTATGCAAGGCCTGGCAAGTCGAACGGG
GATGTGCGGGCCCTCACCTACTGTGACCTACACAAGATCCATCGGGACGACCTGCTGGAG
GTGCTGGACATGTACCCTGAGTTCTCCGACCACTTCTGGTCCAGCCTGGAGATCACCTTC
AACCTGCGAGATACCAACATGATCCCGGGCTCCCCCGGCAGTACGGAGTTAGAGGGTGGC
TTCAGTCGGCAACGCAAGCGCAAGTTGTCCTTCCGCAGGCGCACGGACAAGGACACGGAG
CAGCCAGGGGAGGTGTCGGCCTTGGGGCCGGGCCGGGCGGGGGCAGGGCCGAGTAGCCGG
GGCCGGCCGGGGGGGCCGTGGGGGGAGAGCCCGTCCAGTGGCCCCTCCAGCCCTGAGAGC
AGTGAGGATGAGGGCCCAGGCCGCAGCTCCAGCCCCCTCCGCCTGGTGCCCTTCTCCAGC
CCCAGGCCCCCCGGAGAGCCGCCGGGTGGGGAGCCCCTGATGGAGGACTGCGAGAAGAGC
AGCGACACTTGCAACCCCCTGTCAGGCGCCTTCTCAGGAGTGTCCAACATTTTCAGCTTC
TGGGGGGACAGTCGGGGCCGCCAGTACCAGGAGCTCCCTCGATGCCCCGCCCCCACCCCC
AGCCTCCTCAACATCCCCCTCTCCAGCCCGGGTCGGCGGCCCCGGGGCGACGTGGAGAGC
AGGCTGGATGCCCTCCAGCGCCAGCTCAACAGGCTGGAGACCCGGCTGAGTGCAGACATG
GCCACTGTCCTGCAGCTGCTACAGAGGCAGATGACGCTGGTCCCGCCCGCCTACAGTGCT
GTGACCACCCCGGGGCCTGGCCCCACTTCCACATCCCCGCTGTTGCCCGTCAGCCCCCTC
CCCACCCTCACCTTGGACTCGCTTTCTCAGGTTTCCCAGTTCATGGCGTGTGAGGAGCTG
CCCCCGGGGGCCCCAGAGCTTCCCCAAGAAGGCCCCACACGACGCCTCTCCCTACCGGGC
CAGCTGGGGGCCCTCACCTCCCAGCCCCTGCACAGACACGGCTCGGACCCGGGCAGTTAG
Target 1 GenBank Gene ID
Target 1 GeneCard ID KCNH2 Link Image
Target 1 GenAtlas ID KCNH2 Link Image
Target 1 HGNC ID HGNC:6251 Link Image
Target 1 Chromosome Location 7
Target 1 Locus 7q35-q36
Target 1 SNPs SNPJam Report Link Image
Target 1 General References
  1. Berthet M, Denjoy I, Donger C, Demay L, Hammoude H, Klug D, Schulze-Bahr E, Richard P, Funke H, Schwartz K, Coumel P, Hainque B, Guicheney P: C-terminal HERG mutations: the role of hypokalemia and a KCNQ1-associated mutation in cardiac event occurrence. Circulation. 1999 Mar 23;99(11):1464-70. [PubMed Link Image]
  2. Chen J, Zou A, Splawski I, Keating MT, Sanguinetti MC: Long QT syndrome-associated mutations in the Per-Arnt-Sim (PAS) domain of HERG potassium channels accelerate channel deactivation. J Biol Chem. 1999 Apr 9;274(15):10113-8. [PubMed Link Image]
  3. Abbott GW, Sesti F, Splawski I, Buck ME, Lehmann MH, Timothy KW, Keating MT, Goldstein SA: MiRP1 forms IKr potassium channels with HERG and is associated with cardiac arrhythmia. Cell. 1999 Apr 16;97(2):175-87. [PubMed Link Image]
  4. Jongbloed RJ, Wilde AA, Geelen JL, Doevendans P, Schaap C, Van Langen I, van Tintelen JP, Cobben JM, Beaufort-Krol GC, Geraedts JP, Smeets HJ: Novel KCNQ1 and HERG missense mutations in Dutch long-QT families. Hum Mutat. 1999;13(4):301-10. [PubMed Link Image]
  5. Yoshida H, Horie M, Otani H, Takano M, Tsuji K, Kubota T, Fukunami M, Sasayama S: Characterization of a novel missense mutation in the pore of HERG in a patient with long QT syndrome. J Cardiovasc Electrophysiol. 1999 Sep;10(9):1262-70. [PubMed Link Image]
  6. Larsen LA, Svendsen IH, Jensen AM, Kanters JK, Andersen PS, Moller M, Sorensen SA, Sandoe E, Jacobsen JR, Vuust J, Christiansen M: Long QT syndrome with a high mortality rate caused by a novel G572R missense mutation in KCNH2. Clin Genet. 2000 Feb;57(2):125-30. [PubMed Link Image]
  7. Paulussen A, Yang P, Pangalos M, Verhasselt P, Marrannes R, Verfaille C, Vandenberk I, Crabbe R, Konings F, Luyten W, Armstrong M: Analysis of the human KCNH2(HERG) gene: identification and characterization of a novel mutation Y667X associated with long QT syndrome and a non-pathological 9 bp insertion. Hum Mutat. 2000 May;15(5):483. [PubMed Link Image]
  8. Cui J, Melman Y, Palma E, Fishman GI, McDonald TV: Cyclic AMP regulates the HERG K(+) channel by dual pathways. Curr Biol. 2000 Jun 1;10(11):671-4. [PubMed Link Image]
  9. Laitinen P, Fodstad H, Piippo K, Swan H, Toivonen L, Viitasalo M, Kaprio J, Kontula K: Survey of the coding region of the HERG gene in long QT syndrome reveals six novel mutations and an amino acid polymorphism with possible phenotypic effects. Hum Mutat. 2000 Jun;15(6):580-1. [PubMed Link Image]
  10. Splawski I, Shen J, Timothy KW, Lehmann MH, Priori S, Robinson JL, Moss AJ, Schwartz PJ, Towbin JA, Vincent GM, Keating MT: Spectrum of mutations in long-QT syndrome genes. KVLQT1, HERG, SCN5A, KCNE1, and KCNE2. Circulation. 2000 Sep 5;102(10):1178-85. [PubMed Link Image]
  11. 11374908 Soejima H, Kawamoto S, Akai J, Miyoshi O, Arai Y, Morohka T, Matsuo S, Niikawa N, Kimura A, Okubo K, Mukai T: Isolation of novel heart-specific genes using the BodyMap database. Genomics. 2001 May 15;74(1):115-20.
  12. 12062363 Hayashi K, Shimizu M, Ino H, Yamaguchi M, Mabuchi H, Hoshi N, Higashida H: Characterization of a novel missense mutation E637K in the pore-S6 loop of HERG in a patient with long QT syndrome. Cardiovasc Res. 2002 Apr;54(1):67-76.
  13. 12063277 Gong Q, Anderson CL, January CT, Zhou Z: Role of glycosylation in cell surface expression and stability of HERG potassium channels. Am J Physiol Heart Circ Physiol. 2002 Jul;283(1):H77-84.
  14. 7889573 Curran ME, Splawski I, Timothy KW, Vincent GM, Green ED, Keating MT: A molecular basis for cardiac arrhythmia: HERG mutations cause long QT syndrome. Cell. 1995 Mar 10;80(5):795-803.
  15. 8159766 Warmke JW, Ganetzky B: A family of potassium channel genes related to eag in Drosophila and mammals. Proc Natl Acad Sci U S A. 1994 Apr 12;91(8):3438-42.
  16. 8635257 Benson DW, MacRae CA, Vesely MR, Walsh EP, Seidman JG, Seidman CE, Satler CA: Missense mutation in the pore region of HERG causes familial long QT syndrome. Circulation. 1996 May 15;93(10):1791-5.
  17. 8877771 Dausse E, Berthet M, Denjoy I, Andre-Fouet X, Cruaud C, Bennaceur M, Faure S, Coumel P, Schwartz K, Guicheney P: A mutation in HERG associated with notched T waves in long QT syndrome. J Mol Cell Cardiol. 1996 Aug;28(8):1609-15.
  18. 8914737 Satler CA, Walsh EP, Vesely MR, Plummer MH, Ginsburg GS, Jacob HJ: Novel missense mutation in the cyclic nucleotide-binding domain of HERG causes long QT syndrome. Am J Med Genet. 1996 Oct 2;65(1):27-35.
  19. 9024139 Tanaka T, Nagai R, Tomoike H, Takata S, Yano K, Yabuta K, Haneda N, Nakano O, Shibata A, Sawayama T, Kasai H, Yazaki Y, Nakamura Y: Four novel KVLQT1 and four novel HERG mutations in familial long-QT syndrome. Circulation. 1997 Feb 4;95(3):565-7.
  20. 9230439 McDonald TV, Yu Z, Ming Z, Palma E, Meyers MB, Wang KW, Goldstein SA, Fishman GI: A minK-HERG complex regulates the cardiac potassium current I(Kr). Nature. 1997 Jul 17;388(6639):289-92.
  21. 9351446 Lees-Miller JP, Kondo C, Wang L, Duff HJ: Electrophysiological characterization of an alternatively processed ERG K+ channel in mouse and human hearts. Circ Res. 1997 Nov;81(5):719-26.
  22. 9351462 London B, Trudeau MC, Newton KP, Beyer AK, Copeland NG, Gilbert DJ, Jenkins NA, Satler CA, Robertson GA: Two isoforms of the mouse ether-a-go-go-related gene coassemble to form channels with properties similar to the rapidly activating component of the cardiac delayed rectifier K+ current. Circ Res. 1997 Nov;81(5):870-8.
  23. 9452080 Akimoto K, Furutani M, Imamura S, Furutani Y, Kasanuki H, Takao A, Momma K, Matsuoka R: Novel missense mutation (G601S) of HERG in a Japanese long QT syndrome family. Hum Mutat. 1998;Suppl 1:S184-6.
  24. 9544837 Satler CA, Vesely MR, Duggal P, Ginsburg GS, Beggs AH: Multiple different missense mutations in the pore region of HERG in patients with long QT syndrome. Hum Genet. 1998 Mar;102(3):265-72.
  25. 9600240 Itoh T, Tanaka T, Nagai R, Kamiya T, Sawayama T, Nakayama T, Tomoike H, Sakurada H, Yazaki Y, Nakamura Y: Genomic organization and mutational analysis of HERG, a gene responsible for familial long QT syndrome. Hum Genet. 1998 Apr;102(4):435-9.
  26. 9693036 Splawski I, Shen J, Timothy KW, Vincent GM, Lehmann MH, Keating MT: Genomic structure of three long QT syndrome genes: KVLQT1, HERG, and KCNE1. Genomics. 1998 Jul 1;51(1):86-97.
  27. 9765245 Kupershmidt S, Snyders DJ, Raes A, Roden DM: A K+ channel splice variant common in human heart lacks a C-terminal domain required for expression of rapidly activating delayed rectifier current. J Biol Chem. 1998 Oct 16;273(42):27231-5.
  28. 9845367 Morais Cabral JH, Lee A, Cohen SL, Chait BT, Li M, Mackinnon R: Crystal structure and functional analysis of the HERG potassium channel N terminus: a eukaryotic PAS domain. Cell. 1998 Nov 25;95(5):649-55.
Target 1 Drug References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed Link Image]
Drug Target 2 [top]
Target 2 ID 492
Target 2 Name Histamine H1 receptor
Target 2 Synonyms Not Available
Target 2 Gene Name HRH1
Target 2 Protein Sequence >Histamine H1 receptor 
MSLPNSSCLLEDKMCEGNKTTMASPQLMPLVVVLSTICLVTVGLNLLVLYAVRSERKLHT
VGNLYIVSLSVADLIVGAVVMPMNILYLLMSKWSLGRPLCLFWLSMDYVASTASIFSVFI
LCIDRYRSVQQPLRYLKYRTKTRASATILGAWFLSFLWVIPILGWNHFMQQTSVRREDKC
ETDFYDVTWFKVMTAIINFYLPTLLMLWFYAKIYKAVRQHCQHRELINRSLPSFSEIKLR
PENPKGDAKKPGKESPWEVLKRKPKDAGGGSVLKSPSQTPKEMKSPVVFSQEDDREVDKL
YCFPLDIVHMQAAAEGSSRDYVAVNRSHGQLKTDEQGLNTHGASEISEDQMLGDSQSFSR
TDSDTTTETAPGKGKLRSGSNTGLDYIKFTWKRLRSHSRQYVSGLHMNRERKAAKQLGFI
MAAFILCWIPYFIFFMVIAFCKNCCNEHLHMFTIWLGYINSTLNPLIYPLCNENFKKTFK
RILHIRS
Target 2 Number of Residues 495
Target 2 Molecular Weight 55785
Target 2 Theoretical pI 9.58
Target 2 GO Classification
Function
amine receptor activity
histamine receptor activity
signal transducer activity
receptor activity
transmembrane receptor activity
G-protein coupled receptor activity
rhodopsin-like receptor activity
Process
cellular process
cell communication
signal transduction
cell surface receptor linked signal transduction
G-protein coupled receptor protein signaling pathway
Component
cell
membrane
intrinsic to membrane
integral to membrane
Target 2 General Function Involved in rhodopsin-like receptor activity
Target 2 Specific Function In peripheral tissues, the H1 subclass of histamine receptors mediates the contraction of smooth muscles, increase in capillary permeability due to contraction of terminal venules, and catecholamine release from adrenal medulla, as well as mediating neurotransmission in the central nervous system
Target 2 Pathways Not Available
Target 2 Reactions Not Available
Target 2 Pfam Domain Function
Target 2 Signals
  • None
Target 2 Transmembrane Regions
  • 30-49
  • 64-83
  • 102-123
  • 146-165
  • 190-210
  • 419-438
  • 451-470
Target 2 Essentiality Non-Essential
Target 2 GenBank ID Protein 510296 Link Image
Target 2 UniProtKB/Swiss-Prot ID P35367 Link Image
Target 2 UniProtKB/Swiss-Prot Entry Name HRH1_HUMAN Link Image
Target 2 PDB ID Not Available
Target 2 Cellular Location
  • Membrane
  • multi-pass membrane protein
Target 2 Gene Sequence >1464 bp 
ATGAGCCTCCCCAATTCCTCCTGCCTCTTAGAAGACAAGATGTGTGAGGGCAACAAGACC
ACTATGGCCAGCCCCCAGCTGATGCCCCTGGTGGTGGTCCTGAGCACTATCTGCTTGGTC
ACAGTAGGGCTCAACCTGCTGGTGCTGTATGCCGTACGGAGTGAGCGGAAGCTCCACACT
GTGGGGAACCTGTACATCGTCAGCCTCTCGGTGGCGGACTTGATCGTGGGTGCCGTCGTC
ATGCCTATGAACATCCTCTACCTGCTCATGTCCAAGTGGTCACTGGGCCGTCCTCTCTGC
CTCTTTTGGCTTTCCATGGACTATGTGGCCAGCACAGCGTCCATTTTCAGTGTCTTCATC
CTGTGCATTGATCGCTACCGCTCTGTCCAGCAGCCCCTCAGGTACCTTAAGTATCGTACC
AAGACCCGAGCCTCGGCCACCATTCTGGGGGCCTGGTTTCTCTCTTTTCTGTGGGTTATT
CCCATTCTAGGCTGGAATCACTTCATGCAGCAGACCTCGGTGCGCCGAGAGGACAAGTGT
GAGACAGACTTCTATGATGTCACCTGGTTCAAGGTCATGACTGCCATCATCAACTTCTAC
CTGCCCACCTTGCTCATGCTCTGGTTCTATGCCAAGATCTACAAGGCCGTACGACAACAC
TGCCAGCACCGGGAGCTCATCAATAGGTCCCTCCCTTCCTTCTCAGAAATTAAGCTGAGG
CCAGAGAACCCCAAGGGGGATGCCAAGAAACCAGGGAAGGAGTCTCCCTGGGAGGTTCTG
AAAAGGAAGCCAAAAGATGCTGGTGGTGGATCTGTCTTGAAGTCACCATCCCAAACCCCC
AAGGAGATGAAATCCCCAGTTGTCTTCAGCCAAGAGGATGATAGAGAAGTAGACAAACTC
TACTGCTTTCCACTTGATATTGTGCACATGCAGGCTGCGGCAGAGGGGAGTAGCAGGGAC
TATGTAGCCGTCAACCGGAGCCATGGCCAGCTCAAGACAGATGAGCAGGGCCTGAACACA
CATGGGGCCAGCGAGATATCAGAGGATCAGATGTTAGGTGATAGCCAATCCTTCTCTCGA
ACGGACTCAGATACCACCACAGAGACAGCACCAGGCAAAGGCAAATTGAGGAGTGGGTCT
AACACAGGCCTGGATTACATCAAGTTTACTTGGAAGAGGCTCCGCTCGCATTCAAGACAG
TATGTATCTGGGTTGCACATGAACCGCGAAAGGAAGGCCGCCAAACAGTTGGGTTTTATC
ATGGCAGCCTTCATCCTCTGCTGGATCCCTTATTTCATCTTCTTCATGGTCATTGCCTTC
TGCAAGAACTGTTGCAATGAACATTTGCACATGTTCACCATCTGGCTGGGCTACATCAAC
TCCACACTGAACCCCCTCATCTACCCCTTGTGCAATGAGAACTTCAAGAAGACATTCAAG
AGAATTCTGCATATTCGCTCCTAA
Target 2 GenBank Gene ID
Target 2 GeneCard ID HRH1 Link Image
Target 2 GenAtlas ID HRH1 Link Image
Target 2 HGNC ID HGNC:5182 Link Image
Target 2 Chromosome Location 3
Target 2 Locus 3p25
Target 2 SNPs SNPJam Report Link Image
Target 2 General References
  1. Fukui H, Fujimoto K, Mizuguchi H, Sakamoto K, Horio Y, Takai S, Yamada K, Ito S: Molecular cloning of the human histamine H1 receptor gene. Biochem Biophys Res Commun. 1994 Jun 15;201(2):894-901. [PubMed Link Image]
  2. De Backer MD, Gommeren W, Moereels H, Nobels G, Van Gompel P, Leysen JE, Luyten WH: Genomic cloning, heterologous expression and pharmacological characterization of a human histamine H1 receptor. Biochem Biophys Res Commun. 1993 Dec 30;197(3):1601-8. [PubMed Link Image]
Target 2 Drug References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed Link Image]
  2. Phillips GD, Polosa R, Holgate ST: The effect of histamine-H1 receptor antagonism with terfenadine on concentration-related AMP-induced bronchoconstriction in asthma. Clin Exp Allergy. 1989 Jul;19(4):405-9. [PubMed Link Image]
  3. Rafferty P, Holgate ST: Terfenadine (Seldane) is a potent and selective histamine H1 receptor antagonist in asthmatic airways. Am Rev Respir Dis. 1987 Jan;135(1):181-4. [PubMed Link Image]
  4. Wood-Baker R, Smith R, Holgate ST: A double-blind, placebo controlled study of the effect of the specific histamine H1-receptor antagonist, terfenadine, in chronic severe asthma. Br J Clin Pharmacol. 1995 Jun;39(6):671-5. [PubMed Link Image]
  5. Salata JJ, Jurkiewicz NK, Wallace AA, Stupienski RF 3rd, Guinosso PJ Jr, Lynch JJ Jr: Cardiac electrophysiological actions of the histamine H1-receptor antagonists astemizole and terfenadine compared with chlorpheniramine and pyrilamine. Circ Res. 1995 Jan;76(1):110-9. [PubMed Link Image]
  6. Kishimoto W, Hiroi T, Sakai K, Funae Y, Igarashi T: Metabolism of epinastine, a histamine H1 receptor antagonist, in human liver microsomes in comparison with that of terfenadine. Res Commun Mol Pathol Pharmacol. 1997 Dec;98(3):273-92. [PubMed Link Image]

This project is supported by Genome Alberta & Genome Canada, a not-for-profit organization that is leading Canada's national genomics strategy with $600 million in funding from the federal government. This project is also supported in part by GenomeQuest, Inc., an enterprise genomic information company serving the life science community.