Tmic
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Record Information
Version2.0
Creation Date2009-07-21 20:26:19 UTC
Update Date2014-12-24 20:25:50 UTC
Accession NumberT3D2717
Identification
Common NameEnflurane
ClassSmall Molecule
DescriptionEnflurane is only found in individuals that have used or taken this drug. It is an extremely stable inhalation anesthetic that allows rapid adjustments of anesthesia depth with little change in pulse or respiratory rate. [PubChem]Enflurane induces a reduction in junctional conductance by decreasing gap junction channel opening times and increasing gap junction channel closing times. Enflurane also activates calcium dependent ATPase in the sarcoplasmic reticulum by increasing the fluidity of the lipid membrane. It also appears to bind the D subunit of ATP synthase and NADH dehydogenase. Enflurane also binds to and angonizes the GABA receptor, the large conductance Ca2+ activated potassium channel, the glycine receptor, and antagonizes the glutamate receptor receptor. These yield a decreased depolarization and therefore, tissue excitability which results in anesthesia.
Compound Type
  • Anesthetic
  • Anesthetic, Inhalation
  • Drug
  • General Anesthetic
  • Lachrymator
  • Metabolite
  • Organic Compound
  • Organochloride
  • Organofluoride
  • Synthetic Compound
Chemical Structure
Thumb
Synonyms
Synonym
2-chloro-1,1,2-trifluoroethyl difluoromethyl ether
Alyrane
Anesthetic 347
Anesthetic Compound No. 347
Compound 347
Efrane
Endurane
Enfluran
Enflurano
Enfluranum
Ethrane
Methylflurether
Ohio 347
Chemical FormulaC3H2ClF5O
Average Molecular Mass184.492 g/mol
Monoisotopic Mass183.971 g/mol
CAS Registry Number13838-16-9
IUPAC Name2-chloro-1-(difluoromethoxy)-1,1,2-trifluoroethane
Traditional Nameenflurane
SMILESFC(F)OC(F)(F)C(F)Cl
InChI IdentifierInChI=1/C3H2ClF5O/c4-1(5)3(8,9)10-2(6)7/h1-2H
InChI KeyInChIKey=JPGQOUSTVILISH-UHFFFAOYNA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as organofluorides. Organofluorides are compounds containing a chemical bond between a carbon atom and a fluorine atom.
KingdomOrganic compounds
Super ClassOrganohalogen compounds
ClassOrganofluorides
Sub ClassNot Available
Direct ParentOrganofluorides
Alternative Parents
Substituents
  • Organic oxygen compound
  • Hydrocarbon derivative
  • Organooxygen compound
  • Organofluoride
  • Organochloride
  • Alkyl halide
  • Alkyl fluoride
  • Alkyl chloride
  • Aliphatic acyclic compound
Molecular FrameworkAliphatic acyclic compounds
External Descriptors
Biological Properties
StatusDetected and Not Quantified
OriginExogenous
Cellular Locations
  • Cytoplasm
  • Extracellular
  • Membrane
Biofluid LocationsNot Available
Tissue LocationsNot Available
PathwaysNot Available
ApplicationsNot Available
Biological RolesNot Available
Chemical RolesNot Available
Physical Properties
StateLiquid
AppearanceNot Available
Experimental Properties
PropertyValue
Melting PointNot Available
Boiling Point56.5
Solubility5620 mg/L (at 37°C)
LogP2.1
Predicted Properties
PropertyValueSource
Water Solubility3.9 g/LALOGPS
logP2.24ALOGPS
logP2.8ChemAxon
logS-1.7ALOGPS
pKa (Strongest Basic)-5ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count1ChemAxon
Hydrogen Donor Count0ChemAxon
Polar Surface Area9.23 ŲChemAxon
Rotatable Bond Count3ChemAxon
Refractivity23.07 m³·mol⁻¹ChemAxon
Polarizability9.74 ųChemAxon
Number of Rings0ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-014i-9700000000-853b1a9a2c5092ed803fView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-014i-1900000000-4d034b914ffdba24bc4dView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0159-3900000000-ffa0ad51b68a798a19ecView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-014i-3900000000-2afb1bd4a0ff78bf685cView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-00ls-9700000000-b8f66e13b2c7ea3b8afdView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-01q9-1900000000-16ebf7410f0a86a95b6bView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-02u1-5900000000-156ada188e3d7c93066bView in MoNA
MSMass Spectrum (Electron Ionization)splash10-0gb9-9300000000-03817aefdcc06ee54c49View in MoNA
Toxicity Profile
Route of ExposureRapidly absorbed into the circulation via the lungs.
Mechanism of ToxicityEnflurane induces a reduction in junctional conductance by decreasing gap junction channel opening times and increasing gap junction channel closing times. Enflurane also activates calcium dependent ATPase in the sarcoplasmic reticulum by increasing the fluidity of the lipid membrane. It also appears to bind the D subunit of ATP synthase and NADH dehydogenase. Enflurane also binds to and angonizes the GABA receptor, the large conductance Ca2+ activated potassium channel, the glycine receptor, and antagonizes the glutamate receptor receptor. These yield a decreased depolarization and therefore, tissue excitability which results in anesthesia.
Metabolism2.4% of the dose is slowly metabolized hepatically via oxidation and dehalogenation (primarily through the actions of cytochrome P450 2E1). Leads to low levels of serum fluoride (15 µmol/L).
Toxicity ValuesLD50: 5.4 ml/kg (oral, rat).
Lethal DoseNot Available
Carcinogenicity (IARC Classification)No indication of carcinogenicity to humans (not listed by IARC).
Uses/SourcesUsed for the induction and maintenance of general anaesthesia during surgery and cesarean section and also used for analgesia during vaginal delivery.
Minimum Risk LevelNot Available
Health EffectsNot Available
SymptomsSymptoms of acute overdose include nausea, vomiting, irritation to the eyes, skin and nose/throat, headache, dizziness, and drowsiness. Symptoms of chronic overdose include hypotension, cardiac arrhythmias, respiratory depression, and liver/kidney dysfunction.
TreatmentNot Available
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
DrugBank IDDB00228
HMDB IDHMDB14373
PubChem Compound ID3226
ChEMBL IDCHEMBL1257
ChemSpider ID3113
KEGG IDC07516
UniProt IDNot Available
OMIM ID
ChEBI ID4792
BioCyc IDNot Available
CTD IDNot Available
Stitch IDEnflurane
PDB IDNot Available
ACToR IDNot Available
Wikipedia LinkEnflurane
References
Synthesis Reference

Terrell, R.C.; U.S. Patents 3,469,011; September 23,1969 and 3,527,813; September 8,
1970; both assigned to Air Reduction Company, Incorporated.

MSDSLink
General References
  1. Drugs.com [Link]
  2. Minrad International Inc. (2005). Compound 347: Enflurane, USP Liquid for Inhalation. [Link]
Gene Regulation
Up-Regulated GenesNot Available
Down-Regulated GenesNot Available

Targets

1. GABA-A receptor (anion channel) (Protein Group)
General Function:
Inhibitory extracellular ligand-gated ion channel activity
Specific Function:
Component of the heteropentameric receptor for GABA, the major inhibitory neurotransmitter in the vertebrate brain. Functions also as histamine receptor and mediates cellular responses to histamine. Functions as receptor for diazepines and various anesthetics, such as pentobarbital; these are bound at a separate allosteric effector binding site. Functions as ligand-gated chloride channel (By similarity).
Included Proteins:
P14867 , P47869 , P34903 , P48169 , P31644 , Q16445 , P18505 , P47870 , P28472 , O14764 , P78334 , Q8N1C3 , P18507 , Q99928 , O00591 , Q9UN88
References
  1. Franks NP: Molecular targets underlying general anaesthesia. Br J Pharmacol. 2006 Jan;147 Suppl 1:S72-81. [16402123 ]
  2. Grasshoff C, Antkowiak B: Effects of isoflurane and enflurane on GABAA and glycine receptors contribute equally to depressant actions on spinal ventral horn neurones in rats. Br J Anaesth. 2006 Nov;97(5):687-94. Epub 2006 Sep 13. [16973644 ]
  3. Greenblatt EP, Meng X: Divergence of volatile anesthetic effects in inhibitory neurotransmitter receptors. Anesthesiology. 2001 Jun;94(6):1026-33. [11465594 ]
General Function:
Transporter activity
Specific Function:
Mitochondrial membrane ATP synthase (F(1)F(0) ATP synthase or Complex V) produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain. F-type ATPases consist of two structural domains, F(1) - containing the extramembraneous catalytic core, and F(0) - containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. During catalysis, ATP turnover in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation. Part of the complex F(1) domain and of the central stalk which is part of the complex rotary element. Rotation of the central stalk against the surrounding alpha(3)beta(3) subunits leads to hydrolysis of ATP in three separate catalytic sites on the beta subunits.
Gene Name:
ATP5D
Uniprot ID:
P30049
Molecular Weight:
17489.755 Da
References
  1. Overington JP, Al-Lazikani B, Hopkins AL: How many drug targets are there? Nat Rev Drug Discov. 2006 Dec;5(12):993-6. [17139284 ]
  2. Imming P, Sinning C, Meyer A: Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34. [17016423 ]
General Function:
Voltage-gated potassium channel activity
Specific Function:
Potassium channel activated by both membrane depolarization or increase in cytosolic Ca(2+) that mediates export of K(+). It is also activated by the concentration of cytosolic Mg(2+). Its activation dampens the excitatory events that elevate the cytosolic Ca(2+) concentration and/or depolarize the cell membrane. It therefore contributes to repolarization of the membrane potential. Plays a key role in controlling excitability in a number of systems, such as regulation of the contraction of smooth muscle, the tuning of hair cells in the cochlea, regulation of transmitter release, and innate immunity. In smooth muscles, its activation by high level of Ca(2+), caused by ryanodine receptors in the sarcoplasmic reticulum, regulates the membrane potential. In cochlea cells, its number and kinetic properties partly determine the characteristic frequency of each hair cell and thereby helps to establish a tonotopic map. Kinetics of KCNMA1 channels are determined by alternative splicing, phosphorylation status and its combination with modulating beta subunits. Highly sensitive to both iberiotoxin (IbTx) and charybdotoxin (CTX).
Gene Name:
KCNMA1
Uniprot ID:
Q12791
Molecular Weight:
137558.115 Da
References
  1. Namba T, Ishii TM, Ikeda M, Hisano T, Itoh T, Hirota K, Adelman JP, Fukuda K: Inhibition of the human intermediate conductance Ca(2+)-activated K(+) channel, hIK1, by volatile anesthetics. Eur J Pharmacol. 2000 Apr 28;395(2):95-101. [10794813 ]
  2. Antkowiak B, Kirschfeld K: Enflurane is a potent inhibitor of high conductance Ca(2+)-activated K+ channels of Chara australis. FEBS Lett. 1992 Nov 30;313(3):281-4. [1446749 ]
General Function:
Signal transducer activity
Specific Function:
This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the transport of the calcium.
Gene Name:
ATP2C1
Uniprot ID:
P98194
Molecular Weight:
100576.42 Da
References
  1. Overington JP, Al-Lazikani B, Hopkins AL: How many drug targets are there? Nat Rev Drug Discov. 2006 Dec;5(12):993-6. [17139284 ]
  2. Imming P, Sinning C, Meyer A: Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34. [17016423 ]
General Function:
Inhibitory extracellular ligand-gated ion channel activity
Specific Function:
Component of the heteropentameric receptor for GABA, the major inhibitory neurotransmitter in the vertebrate brain. Functions also as histamine receptor and mediates cellular responses to histamine. Functions as receptor for diazepines and various anesthetics, such as pentobarbital; these are bound at a separate allosteric effector binding site. Functions as ligand-gated chloride channel (By similarity).
Gene Name:
GABRA1
Uniprot ID:
P14867
Molecular Weight:
51801.395 Da
References
  1. Overington JP, Al-Lazikani B, Hopkins AL: How many drug targets are there? Nat Rev Drug Discov. 2006 Dec;5(12):993-6. [17139284 ]
  2. Imming P, Sinning C, Meyer A: Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34. [17016423 ]
General Function:
Transmitter-gated ion channel activity
Specific Function:
The glycine receptor is a neurotransmitter-gated ion channel. Binding of glycine to its receptor increases the chloride conductance and thus produces hyperpolarization (inhibition of neuronal firing).
Gene Name:
GLRA1
Uniprot ID:
P23415
Molecular Weight:
52623.35 Da
References
  1. Overington JP, Al-Lazikani B, Hopkins AL: How many drug targets are there? Nat Rev Drug Discov. 2006 Dec;5(12):993-6. [17139284 ]
  2. Imming P, Sinning C, Meyer A: Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34. [17016423 ]
General Function:
Nadh dehydrogenase (ubiquinone) activity
Specific Function:
Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity).
Gene Name:
MT-ND1
Uniprot ID:
P03886
Molecular Weight:
35660.055 Da
References
  1. Overington JP, Al-Lazikani B, Hopkins AL: How many drug targets are there? Nat Rev Drug Discov. 2006 Dec;5(12):993-6. [17139284 ]
  2. Imming P, Sinning C, Meyer A: Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34. [17016423 ]
General Function:
Voltage-gated potassium channel activity
Specific Function:
Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes, primarily in the brain and the central nervous system, but also in the kidney (PubMed:19903818). Contributes to the regulation of the membrane potential and nerve signaling, and prevents neuronal hyperexcitability (PubMed:17156368). Forms tetrameric potassium-selective channels through which potassium ions pass in accordance with their electrochemical gradient. The channel alternates between opened and closed conformations in response to the voltage difference across the membrane (PubMed:19912772). Can form functional homotetrameric channels and heterotetrameric channels that contain variable proportions of KCNA1, KCNA2, KCNA4, KCNA5, KCNA6, KCNA7, and possibly other family members as well; channel properties depend on the type of alpha subunits that are part of the channel (PubMed:12077175, PubMed:17156368). Channel properties are modulated by cytoplasmic beta subunits that regulate the subcellular location of the alpha subunits and promote rapid inactivation of delayed rectifier potassium channels (PubMed:12077175, PubMed:17156368). In vivo, membranes probably contain a mixture of heteromeric potassium channel complexes, making it difficult to assign currents observed in intact tissues to any particular potassium channel family member. Homotetrameric KCNA1 forms a delayed-rectifier potassium channel that opens in response to membrane depolarization, followed by slow spontaneous channel closure (PubMed:19912772, PubMed:19968958, PubMed:19307729, PubMed:19903818). In contrast, a heterotetrameric channel formed by KCNA1 and KCNA4 shows rapid inactivation (PubMed:17156368). Regulates neuronal excitability in hippocampus, especially in mossy fibers and medial perforant path axons, preventing neuronal hyperexcitability. Response to toxins that are selective for KCNA1, respectively for KCNA2, suggests that heteromeric potassium channels composed of both KCNA1 and KCNA2 play a role in pacemaking and regulate the output of deep cerebellar nuclear neurons (By similarity). May function as down-stream effector for G protein-coupled receptors and inhibit GABAergic inputs to basolateral amygdala neurons (By similarity). May contribute to the regulation of neurotransmitter release, such as gamma-aminobutyric acid (GABA) release (By similarity). Plays a role in regulating the generation of action potentials and preventing hyperexcitability in myelinated axons of the vagus nerve, and thereby contributes to the regulation of heart contraction (By similarity). Required for normal neuromuscular responses (PubMed:11026449, PubMed:17136396). Regulates the frequency of neuronal action potential firing in response to mechanical stimuli, and plays a role in the perception of pain caused by mechanical stimuli, but does not play a role in the perception of pain due to heat stimuli (By similarity). Required for normal responses to auditory stimuli and precise location of sound sources, but not for sound perception (By similarity). The use of toxins that block specific channels suggest that it contributes to the regulation of the axonal release of the neurotransmitter dopamine (By similarity). Required for normal postnatal brain development and normal proliferation of neuronal precursor cells in the brain (By similarity). Plays a role in the reabsorption of Mg(2+) in the distal convoluted tubules in the kidney and in magnesium ion homeostasis, probably via its effect on the membrane potential (PubMed:23903368, PubMed:19307729).
Gene Name:
KCNA1
Uniprot ID:
Q09470
Molecular Weight:
56465.01 Da
References
  1. Overington JP, Al-Lazikani B, Hopkins AL: How many drug targets are there? Nat Rev Drug Discov. 2006 Dec;5(12):993-6. [17139284 ]
  2. Imming P, Sinning C, Meyer A: Drugs, their targets and the nature and number of drug targets. Nat Rev Drug Discov. 2006 Oct;5(10):821-34. [17016423 ]
General Function:
Pdz domain binding
Specific Function:
Ionotropic glutamate receptor. L-glutamate acts as an excitatory neurotransmitter at many synapses in the central nervous system. Binding of the excitatory neurotransmitter L-glutamate induces a conformation change, leading to the opening of the cation channel, and thereby converts the chemical signal to an electrical impulse. The receptor then desensitizes rapidly and enters a transient inactive state, characterized by the presence of bound agonist. In the presence of CACNG4 or CACNG7 or CACNG8, shows resensitization which is characterized by a delayed accumulation of current flux upon continued application of glutamate.
Gene Name:
GRIA1
Uniprot ID:
P42261
Molecular Weight:
101505.245 Da
References
  1. Dildy-Mayfield JE, Eger EI 2nd, Harris RA: Anesthetics produce subunit-selective actions on glutamate receptors. J Pharmacol Exp Ther. 1996 Mar;276(3):1058-65. [8786535 ]
10. Glycine receptor (alpha-1/beta) (Protein Group)
General Function:
Transmitter-gated ion channel activity
Specific Function:
The glycine receptor is a neurotransmitter-gated ion channel. Binding of glycine to its receptor increases the chloride conductance and thus produces hyperpolarization (inhibition of neuronal firing).
Included Proteins:
P23415 , P48167
References
  1. Grasshoff C, Antkowiak B: Effects of isoflurane and enflurane on GABAA and glycine receptors contribute equally to depressant actions on spinal ventral horn neurones in rats. Br J Anaesth. 2006 Nov;97(5):687-94. Epub 2006 Sep 13. [16973644 ]
General Function:
Protein phosphatase binding
Specific Function:
Forms a voltage-independent potassium channel that is activated by intracellular calcium (PubMed:26148990). Activation is followed by membrane hyperpolarization which promotes calcium influx. Required for maximal calcium influx and proliferation during the reactivation of naive T-cells. The channel is blocked by clotrimazole and charybdotoxin but is insensitive to apamin (PubMed:17157250, PubMed:18796614).
Gene Name:
KCNN4
Uniprot ID:
O15554
Molecular Weight:
47695.12 Da
References
  1. Namba T, Ishii TM, Ikeda M, Hisano T, Itoh T, Hirota K, Adelman JP, Fukuda K: Inhibition of the human intermediate conductance Ca(2+)-activated K(+) channel, hIK1, by volatile anesthetics. Eur J Pharmacol. 2000 Apr 28;395(2):95-101. [10794813 ]
General Function:
Temperature-gated cation channel activity
Specific Function:
Receptor-activated non-selective cation channel involved in detection of pain and possibly also in cold perception and inner ear function (PubMed:25389312, PubMed:25855297). Has a central role in the pain response to endogenous inflammatory mediators and to a diverse array of volatile irritants, such as mustard oil, cinnamaldehyde, garlic and acrolein, an irritant from tears gas and vehicule exhaust fumes (PubMed:25389312, PubMed:20547126). Is also activated by menthol (in vitro)(PubMed:25389312). Acts also as a ionotropic cannabinoid receptor by being activated by delta(9)-tetrahydrocannabinol (THC), the psychoactive component of marijuana (PubMed:25389312). May be a component for the mechanosensitive transduction channel of hair cells in inner ear, thereby participating in the perception of sounds. Probably operated by a phosphatidylinositol second messenger system (By similarity).
Gene Name:
TRPA1
Uniprot ID:
O75762
Molecular Weight:
127499.88 Da
References
  1. Nilius B, Prenen J, Owsianik G: Irritating channels: the case of TRPA1. J Physiol. 2011 Apr 1;589(Pt 7):1543-9. doi: 10.1113/jphysiol.2010.200717. Epub 2010 Nov 15. [21078588 ]