Transporter Classification Database


The Transporter Classification Database is an International Union of Biochemistry and Molecular Biology -approved classification system for membrane transport proteins, including ion channels.

Classification

The upper level of classification and a few examples of proteins with known 3D structure:

1. Channels">Ion channel">Channels and pores

1.A α-type channels

1.B. β-Barrel porins">Porin (protein)">β-Barrel porins and other outer membrane proteins

1.C [Pore-forming toxin]s (proteins and peptides)

1.D Non-ribosomally synthesized channels

  • 1.D.1 The Gramicidin A Channel Family
  • 1.D.2 The Channel-forming Syringomycin Family
  • 1.D.3 The Channel-Forming Syringopeptin Family
  • 1.D.4 The Tolaasin Channel-forming Family
  • 1.D.5 The Alamethicin or Peptaibol Antibiotic Channel-forming Family
  • 1.D.6 The Complexed Poly 3-Hydroxybutyrate Ca2+ Channel Family
  • 1.D.7 The Beticolin Family
  • 1.D.8 The Saponin Family
  • 1.D.9 The Polyglutamine Ion Channel Family
  • 1.D.10 The Ceramide-forming Channel Family
  • 1.D.11 The Surfactin Family
  • 1.D.12 The Beauvericin Family
  • 1.D.13 DNA-delivery Amphipathic Peptide Antibiotics
  • 1.D.14 The Synthetic Leu/Ser Amphipathic Channel-forming Peptide Family
  • 1.D.15 The Daptomycin (Daptomycin) Family
  • 1.D.16 The Synthetic Amphipathic Pore-forming Heptapeptide Family
  • 1.D.17 Combinatorially-designed, Pore-forming, β-sheet Peptide Family
  • 1.D.18 The Pore-forming Guanosine-Bile Acid Conjugate Family
  • 1.D.19 Ca2+ Channel-forming Drug, Digitoxin Family
  • 1.D.20 The Pore-forming Polyene Macrolide Antibiotic/fungal Agent Family
  • 1.D.21 The Lipid Nanopore Family
  • 1.D.22 The Proton-Translocating Carotenoid Pigment, Zeaxanthin Family
  • 1.D.23 Phenylene Ethynylene Pore-forming Antimicrobial Family
  • 1.D.24 The Marine Sponge Polytheonamide B Family
  • 1.D.25 The Arylamine Foldamer Family
  • 1.D.26 The Dihydrodehydrodiconiferyl alcohol 9'-O-β-D-glucoside Family
  • 1.D.27 The Thiourea isosteres Family
  • 1.D.28 The Lipopeptaibol Family
  • 1.D.29 The Macrocyclic Oligocholate Family
  • 1.D.30 The Artificial Hydrazide-appended pillararene Channels Family
  • 1.D.31 The Amphotericin B Family
  • 1.D.32 The Pore-forming Novicidin Family
  • 1.D.33 The Channel-forming Polytheonamide B Family
  • 1.D.34 The Channel-forming Oligoester Bolaamphiphiles
  • 1.D.35 The Pore-forming cyclic Lipodepsipeptide Family
  • 1.D.36 The Oligobornene Ion Channel Family
  • 1.D.37 The Hibicuslide C Family
  • 1.D.38 The Cyclic Peptide Nanotube Family
  • 1.D.39 The Light-controlled Azobenzene-based Amphiphilic Molecular Ion Channel Family
  • 1.D.40 The Protein-induced Lipid Toroidal Pore Family
  • 1.D.41 The Sprotetonate-type Ionophore Family
  • 1.D.42 The Phe-Arg Tripeptide-PillarArene Channel Family
  • 1.D.43 The Triazole-tailored Guanosine Dinucleoside Channel Family
  • 1.D.44 The Synthetic Ion Channel with Redox-active Ferrocene Family
  • 1.D.45 The Sonoporation and Electroporation Membrane Pore Family
  • 1.D.46 The DNA Nanopore Family
  • 1.D.47 The Pore-forming Synthetic Cyclic Peptide Family
  • 1.D.48 The Pore-forming Syringomycin E Family
  • 1.D.49 The Transmembrane Carotenoid Radical Channel Family
  • 1.D.50 The Amphiphilic bis-Catechol Anion Transporter Family
  • 1.D.51 The Protein Nanopore Family
  • 1.D.52 The Aromatic Oligoamide Macrocycle Nanopore Family
  • 1.D.53 The alpha, gamma-Peptide Nanotube Family
  • 1.D.54 The potassium-selective Hexyl-Benzoureido-15-Crown-5-Ether Ion Channel Family
  • 1.D.55 The Porphyrin-based Nanopore Family
  • 1.D.56 The Alpha-Aminoisobutyrate Oligomeric Nanopore Family
  • 1.D.57 The Lipid Electro-Pore Family
  • 1.D.58 The Anion Transporting Prodigiosene Family
  • 1.D.59 The Anion Transporting Perenosin Family
  • 1.D.60 The Alpha,Gamma-Cyclic Peptide Family
  • 1.D.61 The Anionophoric Family
  • 1.D.62 The Bis-Triazolyl DiGuanosine Derivative Channel-forming Family
  • 1.D.63 The Peptide-based Nanopore Family
  • 1.D.64 The Carbon Nanotube Family
  • 1.D.65 The Pore-forming Amphidinol Family
  • 1.D.66 The Helical Macromolecule Nanopore Family
  • 1.D.67 The Crown Ether-modified Helical Peptide Ion Channel Family
  • 1.D.68 The Pore-forming Pleuronic Block Polymer Family
  • 1.D.69 The Conical Nanopore Family
  • 1.D.70 The Metallic Nanopore Family
  • 1.D.71 The Synthetic TP359 Peptide Family
  • 1.D.72 The Chloride Carrier Triazine-based Tripodal Receptor Family
  • 1.D.73 The Mesoporous Silica Nanopore Family
  • 1.D.74 The Stimulus-responsive Synthetic Rigid p-Octiphenyl Stave Pore Family

1.F [Vesicle fusion] pores

  • 1.F.1 The Synaptosomal Vesicle Fusion Pore Family
  • 1.F.2 The Octameric Exocyst Family

1.G Viral fusion">Viral protein#Viral envelope">Viral fusion pores

  • 1.G.1 The Viral Pore-forming Membrane Fusion Protein-1 Family
  • 1.G.2 The Viral Pore-forming Membrane Fusion Protein-2 Family
  • 1.G.3 The Viral Pore-forming Membrane Fusion Protein-3 Family
  • 1.G.4 The Viral Pore-forming Membrane Fusion Protein-4 Family
  • 1.G.5 The Viral Pore-forming Membrane Fusion Protein-5 Family
  • 1.G.6 The Hepadnaviral S Fusion Protein Family
  • 1.G.7 The Reovirus FAST Fusion Protein Family
  • 1.G.8 The Arenavirus Fusion Protein Family
  • 1.G.9 The Syncytin Family
  • 1.G.10 The Herpes Simplex Virus Membrane Fusion Complex Family
  • 1.G.11 Poxvirus Cell Entry Protein Complex Family
  • 1.G.12 The Avian Leukosis Virus gp95 Fusion Protein Family
  • 1.G.13 The Orthoreovirus Fusion-associated Small Transmembrane Family
  • 1.G.14 The Influenza Virus Hemagglutinin/Fusion Pore-forming Protein Family
  • 1.G.15 The Autographa californica Nuclear Polyhedrosis Virus Major Envelope Glycoprotein GP64 Family
  • 1.G.16 The Human Immunodeficiency Virus Type 1 Fusion Peptide Family
  • 1.G.17 The Bovine Leukemia Virus Envelop Glycoprotein Family
  • 1.G.18 The SARS-CoV Fusion Peptide in the Spike Glycoprotein Precursor Family
  • 1.G.19 The Rotavirus Pore-forming Membrane Fusion Complex Family
  • 1.G.20 The Hantavirus Gc Envelope Fusion Glycoprotein Family
  • 1.G.21 The Epstein Barr Virus Gp42 Family
  • 1.G.22 The Cytomegalovirus Glycoprotein gO Family

1.H [Paracellular channel]s

  • 1.H.1 The Claudin Tight Junction Family
  • 1.H.2 The Invertebrate PMP22-Claudin Family

1.I [Membrane-bound channel]s

2. Electrochemical potential-driven transporters

2.A Porters ([uniporter]s, [symporter]s, [antiporter]s)

2.B Nonribosomally synthesized porters

  • 2.B.1 The Valinomycin Carrier Family
  • 2.B.2 The Monensin Family
  • 2.B.3 The Nigericin Family
  • 2.B.4 The Macrotetrolide Antibiotic Family
  • 2.B.5 The Macrocyclic Polyether Family
  • 2.B.6 The Ionomycin Family
  • 2.B.7 The Transmembrane α-helical Peptide Phospholipid Translocation Family
  • 2.B.8 The Bafilomycin A1 Family
  • 2.B.9 The Cell Penetrating Peptide Functional Family
  • 2.B.10 The Synthetic CPP, Transportan Family
  • 2.B.11 The Calcimycin or A23187 Carrier-type Ionophore Family
  • 2.B.12 The Salinomycin Family
  • 2.B.13 The Tetrapyrrolic Macrocyclic Anion Antiporter Family
  • 2.B.14 The Lasalocid A or X-537A Ionophore Family
  • 2.B.15 The Tris-thiourea Tripodal-based Chloride Carrier Family
  • 2.B.16 The Halogen-bond-containing Compound Anion Carrier Family
  • 2.B.17 The Isophthalaminde Derivative H+:Cl Co-transporter Family
  • 2.B.18 The Pyridine-2,6-Dicarboxamine Derivative H+:Cl Co-transporter Family
  • 2.B.19 The Calixpyrrole Derivative Family
  • 2.B.20 The Prodigiosin Chloride/Bicarbonate Exchanger Family
  • 2.B.21 The ortho-Phenylenediamine-bis-Urea Derivative Anion Transporter Family
  • 2.B.22 The Imidazolium-functionalized Anion Transporter Family
  • 2.B.23 The Homotetrameric Transmembrane Zn2+/Co2+:Proton Synthetic Antiporter, Rocker Family
  • 2.B.24 The Anion Carrier Family
  • 2.B.25 The Peptide-mediated Lipid Flip-Flop Family
  • 2.B.26 The Conjugate Family
  • 2.B.27 The Tris-Urea Anion Transporter Family
  • 2.B.29 The Anionophoric Marine Alkaloid Tambjamine Family

2.C Ion-gradient-driven energizers

  • 2.C.1 The TonB-ExbB-ExbD/TolA-TolQ-TolR Family of Auxiliary Proteins for Energization of Outer Membrane Receptor -mediated Active Transport

3. [Primary active transport]ers

3.A. P-P-bond hydrolysis-driven transporters

  • 3.A.1 ABC transporters including BtuCD, molybdate uptake transporter, Cystic fibrosis transmembrane conductance regulator and others
  • 3.A.2 The H+- or Na+-translocating F-type ATPase, V-type ATPase and A-type ATPase superfamily
  • 3.A.3 The P-type ATPase Superfamily
  • 3.A.4 The Arsenite-Antimonite efflux family
  • 3.A.5 General secretory pathway translocon
  • 3.A.6 The Type III Secretory Pathway Family
  • 3.A.7 The Type IV Secretory Pathway Family
  • 3.A.8 The Mitochondrial Protein Translocase Family
  • 3.A.9 The Chloroplast Envelope Protein Translocase Family
  • 3.A.10 H+, Na+-translocating Pyrophosphatase family
  • 3.A.11 The Bacterial Competence-related DNA Transformation Transporter Family
  • 3.A.12 The Septal DNA Translocator Family
  • 3.A.13 The Filamentous Phage Exporter Family
  • 3.A.14 The Fimbrilin/Protein Exporter Family
  • 3.A.15 The Outer Membrane Protein Secreting Main Terminal Branch Family
  • 3.A.16 The Endoplasmic Reticular Retrotranslocon Family
  • 3.A.17 The Phage T7 Injectisome Family
  • 3.A.18 The Nuclear mRNA Exporter Family
  • 3.A.19 The TMS Recognition/Insertion Complex Family
  • 3.A.20 The Peroxisomal Protein Importer Family
  • 3.A.21 The C-terminal Tail-Anchored Membrane Protein Biogenesis/ Insertion Complex Family
  • 3.A.22 The Transcription-coupled TREX/TAP Nuclear mRNA Export Complex Family
  • 3.A.23 The Type VI Symbiosis/Virulence Secretory Pathway Family
  • 3.A.24 Type VII or ESX Protein Secretion System Family
  • 3.A.25 The Symbiont-specific ERAD-like Machinery Family
  • 3.A.26 The Plasmodium Translocon of Exported proteins Family

3.B Decarboxylation-driven transporters

  • 3.B.1 The Na+-transporting Carboxylic Acid Decarboxylase Family

3.C Methyltransfer-driven transporters

  • 3.C.1 The Na+ Transporting Methyltetrahydromethanopterin:Coenzyme M Methyltransferase Family

3.D. Oxidoreduction-driven transporters

They include a number of transmembrane cytochrome b-like proteins including coenzyme Q - cytochrome c reductase ; cytochrome b6f complex; formate dehydrogenase, respiratory nitrate reductase; succinate - coenzyme Q reductase ; and succinate dehydrogenase. See electron transport chain.

3.E. Light absorption-driven transporters

4. Group translocators

4.A Phosphotransfer-driven group translocators

4.B Nicotinamide ribonucleoside uptake transporters

  • 4.B.1 The Nicotinamide Ribonucleoside Uptake Permease Family

4.C Acyl CoA ligase-coupled transporters

  • 4.C.1 The Proposed Fatty Acid Transporter Family
  • 4.C.2 The Carnitine O-Acyl Transferase Family
  • 4.C.3 The Acyl-CoA Thioesterase Family

4.D Polysaccharide Synthase/Exporters

  • 4.D.1 The Putative Vectorial Glycosyl Polymerization Family
  • 4.D.2 The Glycosyl Transferase 2 Family
  • 4.D.3 The Glycan Glucosyl Transferase Family

4.E. Vacuolar Polyphosphate Polymerase-catalyzed Group Translocators

  • 4.E.1 The Vacuolar Polyphosphate Polymerase Family

5. Transport electron carriers

5.A Transmembrane 2-electron transfer carriers

  • 5.A.1 The Disulfide Bond Oxidoreductase D Family
  • 5.A.2 The Disulfide Bond Oxidoreductase B Family
  • 5.A.3 The Prokaryotic Molybdopterin-containing Oxidoreductase Family

5.B Transmembrane 1-electron transfer carriers

  • 5.B.1 The Phagocyte NADPH Oxidase Family
  • 5.B.2 The Eukaryotic Cytochrome b561 Family
  • 5.B.3 The Geobacter Nanowire Electron Transfer Family
  • 5.B.4 The Plant Photosystem I Supercomplex Family
  • 5.B.5 The Extracellular Metal Oxido-Reductase Family
  • 5.B.6 The Transmembrane Epithelial Antigen Protein-3 Ferric Reductase Family
  • 5.B.7 The YedZ (YedZ) Family
  • 5.B.8 The Trans-Outer Membrane Electron Transfer Porin/Cytochrome Complex Family
  • 5.B.9 The Porin-Cytochrome c Family