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(-) Description

Title :  CRYSTAL STRUCTURE OF THE AQP1 WATER CHANNEL
 
Authors :  H. Sui, B. -G. Han, J. K. Lee, P. Walian, B. K. Jap
Date :  19 Oct 01  (Deposition) - 27 Mar 02  (Release) - 13 Jul 11  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.20
Chains :  Asym. Unit :  A
Biol. Unit 1:  A  (4x)
Biol. Unit 2:  A  (8x)
Keywords :  Membrane Protein, Channel Protein, Transmembrane Helices (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  H. Sui, B. G. Han, J. K. Lee, P. Walian, B. K. Jap
Structural Basis Of Water-Specific Transport Through The Aqp1 Water Channel.
Nature V. 414 872 2001
PubMed-ID: 11780053  |  Reference-DOI: 10.1038/414872A

(-) Compounds

Molecule 1 - AQUAPORIN 1
    ChainsA
    Organism CommonCATTLE
    Organism ScientificBOS TAURUS
    Organism Taxid9913
    SynonymAQP1, AQUAPORIN-CHIP, WATER CHANNEL PROTEIN FOR RED BLOOD CELLS AND KIDNEY PROXIMAL TUBULE
    TissueBLOOD

 Structural Features

(-) Chains, Units

  1
Asymmetric Unit A
Biological Unit 1 (4x)A
Biological Unit 2 (8x)A

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (1, 3)

Asymmetric Unit (1, 3)
No.NameCountTypeFull Name
1BNG3Ligand/IonB-NONYLGLUCOSIDE
Biological Unit 1 (1, 12)
No.NameCountTypeFull Name
1BNG12Ligand/IonB-NONYLGLUCOSIDE
Biological Unit 2 (1, 24)
No.NameCountTypeFull Name
1BNG24Ligand/IonB-NONYLGLUCOSIDE

(-) Sites  (3, 3)

Asymmetric Unit (3, 3)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREVAL A:105 , ILE A:108BINDING SITE FOR RESIDUE BNG A 801
2AC2SOFTWAREPHE A:199 , PHE A:208 , HOH A:343 , HOH A:364BINDING SITE FOR RESIDUE BNG A 802
3AC3SOFTWAREILE A:113 , ILE A:117 , GLN A:139 , GLY A:142BINDING SITE FOR RESIDUE BNG A 803

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 1J4N)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 1J4N)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 1J4N)

(-) PROSITE Motifs  (1, 1)

Asymmetric Unit (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1MIPPS00221 MIP family signature.AQP1_BOVIN76-84  1A:76-84
Biological Unit 1 (1, 4)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1MIPPS00221 MIP family signature.AQP1_BOVIN76-84  4A:76-84
Biological Unit 2 (1, 8)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1MIPPS00221 MIP family signature.AQP1_BOVIN76-84  8A:76-84

(-) Exons   (4, 4)

Asymmetric Unit (4, 4)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.1ENSBTAT000000009931ENSBTAE00000343734chr4:68062099-68061650450AQP1_BOVIN1-1501501A:1-150150
1.2ENSBTAT000000009932ENSBTAE00000007725chr4:68050878-68050714165AQP1_BOVIN151-205551A:151-20555
1.3ENSBTAT000000009933ENSBTAE00000007736chr4:68050416-6805033681AQP1_BOVIN206-232271A:206-23227
1.4ENSBTAT000000009934ENSBTAE00000007751chr4:68049877-680478592019AQP1_BOVIN233-291591A:233-24917

(-) Sequences/Alignments

Asymmetric Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it)
Chain A from PDB  Type:PROTEIN  Length:249
 aligned with AQP1_BOVIN | P47865 from UniProtKB/Swiss-Prot  Length:271

    Alignment length:249
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240         
           AQP1_BOVIN     1 MASEFKKKLFWRAVVAEFLAMILFIFISIGSALGFHYPIKSNQTTGAVQDNVKVSLAFGLSIATLAQSVGHISGAHLNPAVTLGLLLSCQISVLRAIMYIIAQCVGAIVATAILSGITSSLPDNSLGLNALAPGVNSGQGLGIEIIGTLQLVLCVLATTDRRRRDLGGSGPLAIGFSVALGHLLAIDYTGCGINPARSFGSSVITHNFQDHWIFWVGPFIGAALAVLIYDFILAPRSSDLTDRVKVWTS 249
               SCOP domains d1j4na_ A: Aquaporin-1                                                                                                                                                                                                                                    SCOP domains
               CATH domains 1j4nA00 A:1-249 Glycerol uptake facilitator protein.                                                                                                                                                                                                      CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh............hhhhhhhhhhhhhhhhhhhhhhhhh...hhhhhhhhhhh...hhhhhhhhhhhhhhhhhhhhhhhhhhh...................hhhhhhhhhhhhhhhhhhhhhh.........hhhhhhhhhhhhhhhhhhhhhh...hhhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhh.......hhhhhhhhhh. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ---------------------------------------------------------------------------MIP      --------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
               Transcript 1 Exon 1.1  PDB: A:1-150 UniProt: 1-150                                                                                                                 Exon 1.2  PDB: A:151-205 UniProt: 151-205              Exon 1.3  PDB: A:206-232   Exon 1.4          Transcript 1
                 1j4n A   1 MASEFKKKLFWRAVVAEFLAMILFIFISIGSALGFHYPIKSNQTTGAVQDNVKVSLAFGLSIATLAQSVGHISGAHLNPAVTLGLLLSCQISVLRAIMYIIAQCVGAIVATAILSGITSSLPDNSLGLNALAPGVNSGQGLGIEIIGTLQLVLCVLATTDRRRRDLGGSGPLAIGFSVALGHLLAIDYTGCGINPARSFGSSVITHNFQDHWIFWVGPFIGAALAVLIYDFILAPRSSDLTDRVKVWTS 249
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240         

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 1)

Asymmetric Unit

(-) CATH Domains  (1, 1)

Asymmetric Unit

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 1J4N)

(-) Gene Ontology  (82, 82)

Asymmetric Unit(hide GO term definitions)
Chain A   (AQP1_BOVIN | P47865)
molecular function
    GO:0008519    ammonium transmembrane transporter activity    Enables the transfer of ammonium from one side of a membrane to the other. Ammonium is the cation NH4+ which is formed from N2 by root-nodule bacteria in leguminous plants and is an excretory product in ammonotelic animals.
    GO:0035379    carbon dioxide transmembrane transporter activity    Enables the transfer of carbon dioxide (CO2) from one side of a membrane to the other.
    GO:0046875    ephrin receptor binding    Interacting selectively and non-covalently with an ephrin receptor.
    GO:0015254    glycerol channel activity    Enables the facilitated diffusion of glycerol (by an energy-independent process) involving passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism.
    GO:0015168    glycerol transmembrane transporter activity    Enables the transfer of glycerol from one side of the membrane to the other. Glycerol is 1,2,3-propanetriol, a sweet, hygroscopic, viscous liquid, widely distributed in nature as a constituent of many lipids.
    GO:0005223    intracellular cGMP activated cation channel activity    Enables the transmembrane transfer of a cation by a channel that opens when intracellular cGMP has been bound by the channel complex or one of its constituent parts.
    GO:0030184    nitric oxide transmembrane transporter activity    Enables the directed movement of nitric oxide, nitrogen monoxide, from one side of a membrane to the other.
    GO:0005267    potassium channel activity    Enables the facilitated diffusion of a potassium ion (by an energy-independent process) involving passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism.
    GO:0015079    potassium ion transmembrane transporter activity    Enables the transfer of potassium ions (K+) from one side of a membrane to the other.
    GO:0022857    transmembrane transporter activity    Enables the transfer of a substance from one side of a membrane to the other.
    GO:0005215    transporter activity    Enables the directed movement of substances (such as macromolecules, small molecules, ions) into, out of or within a cell, or between cells.
    GO:0015250    water channel activity    Transport systems of this type enable facilitated diffusion of water (by an energy-independent process) by passage through a transmembrane aqueous pore or channel without evidence for a carrier-mediated mechanism.
    GO:0005372    water transmembrane transporter activity    Enables the directed movement of water (H2O) from one side of a membrane to the other.
biological process
    GO:0072488    ammonium transmembrane transport    The directed movement of ammonium across a membrane by means of some agent such as a transporter or pore. Ammonium is the cation NH4+.
    GO:0015696    ammonium transport    The directed movement of ammonium into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Ammonium is the cation NH4+ which is formed from N2 by root-nodule bacteria in leguminous plants and is an excretory product in ammonotelic animals.
    GO:0006182    cGMP biosynthetic process    The chemical reactions and pathways resulting in the formation of cyclic GMP, guanosine 3',5'-phosphate.
    GO:0048593    camera-type eye morphogenesis    The process in which the anatomical structures of the eye are generated and organized. The camera-type eye is an organ of sight that receives light through an aperture and focuses it through a lens, projecting it on a photoreceptor field.
    GO:0035378    carbon dioxide transmembrane transport    A process in which carbon dioxide (CO2) is transported from one side of a membrane to the other by means of some agent such as a transporter or pore.
    GO:0015670    carbon dioxide transport    The directed movement of carbon dioxide (CO2) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
    GO:0006884    cell volume homeostasis    Any process involved in maintaining the steady state of a cell's volume. The cell's volume refers to the three-dimensional space occupied by a cell.
    GO:0019725    cellular homeostasis    Any process involved in the maintenance of an internal steady state at the level of the cell.
    GO:0071474    cellular hyperosmotic response    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of detection of, or exposure to, a hyperosmotic environment, i.e. an environment with a higher concentration of solutes than the organism or cell.
    GO:0034644    cellular response to UV    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an ultraviolet radiation (UV light) stimulus. Ultraviolet radiation is electromagnetic radiation with a wavelength in the range of 10 to 380 nanometers.
    GO:0071320    cellular response to cAMP    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a cAMP (cyclic AMP, adenosine 3',5'-cyclophosphate) stimulus.
    GO:0071280    cellular response to copper ion    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a copper ion stimulus.
    GO:0071549    cellular response to dexamethasone stimulus    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a dexamethasone stimulus.
    GO:0070301    cellular response to hydrogen peroxide    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a hydrogen peroxide (H2O2) stimulus.
    GO:0071456    cellular response to hypoxia    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating lowered oxygen tension. Hypoxia, defined as a decline in O2 levels below normoxic levels of 20.8 - 20.95%, results in metabolic adaptation at both the cellular and organismal level.
    GO:0071241    cellular response to inorganic substance    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an inorganic substance stimulus.
    GO:0071260    cellular response to mechanical stimulus    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a mechanical stimulus.
    GO:0071288    cellular response to mercury ion    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a mercury ion stimulus.
    GO:0071300    cellular response to retinoic acid    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a retinoic acid stimulus.
    GO:0071472    cellular response to salt stress    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating an increase or decrease in the concentration of salt (particularly but not exclusively sodium and chloride ions) in the environment.
    GO:0033554    cellular response to stress    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating the organism is under stress. The stress is usually, but not necessarily, exogenous (e.g. temperature, humidity, ionizing radiation).
    GO:0009992    cellular water homeostasis    Any process involved in the maintenance of an internal steady state of water within a cell.
    GO:0051458    corticotropin secretion    The regulated release of corticotropin by a cell. Corticotropin hormone is a polypeptide hormone synthesized and secreted from corticotropes in the anterior lobe of the pituitary gland in response to corticotropin-releasing hormone (CRH) released by the hypothalamus.
    GO:0030950    establishment or maintenance of actin cytoskeleton polarity    Any cellular process that results in the specification, formation or maintenance of polarized actin-based cytoskeletal structures.
    GO:0003094    glomerular filtration    The process in which plasma is filtered through the glomerular membrane which consists of capillary endothelial cells, the basement membrane, and epithelial cells. The glomerular filtrate is the same as plasma except it has no significant amount of protein.
    GO:0015793    glycerol transport    The directed movement of glycerol into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Glycerol is 1,2,3-propanetriol, a sweet, hygroscopic, viscous liquid, widely distributed in nature as a constituent of many lipids.
    GO:0021670    lateral ventricle development    The process whose specific outcome is the progression of the lateral ventricles over time, from the formation to the mature structure. The two lateral ventricles are a cavity in each of the cerebral hemispheres derived from the cavity of the embryonic neural tube. They are separated from each other by the septum pellucidum, and each communicates with the third ventricle by the foramen of Monro, through which also the choroid plexuses of the lateral ventricles become continuous with that of the third ventricle.
    GO:0044241    lipid digestion    The whole of the physical, chemical, and biochemical processes carried out by living organisms to break down ingested lipids into components that may be easily absorbed and directed into metabolism.
    GO:0085018    maintenance of symbiont-containing vacuole by host    The process in which a host organism maintains the structure and function of a symbiont-containing vacuole. The symbiont-containing vacuole is a membrane-bounded vacuole within a host cell in which a symbiont organism resides, and can serve to reduce pathogenicity of invading symbionts by restricting them to the vacuolar compartment.
    GO:0072220    metanephric descending thin limb development    The process whose specific outcome is the progression of the metanephric descending thin limb over time, from its formation to the mature structure. The metanephric descending thin limb is a part of the metanephric loop of Henle situated just after the proximal straight tubule (S3). It extends to the tip of the metanephric loop of Henle.
    GO:0072239    metanephric glomerulus vasculature development    The biological process whose specific outcome is the progression of a metanephric glomerulus vasculature from an initial condition to its mature state. This process begins with the formation of the metanephric glomerulus vasculature and ends with the mature structure. The metanephric glomerulus vasculature is composed of the tubule structures that carry blood or lymph in the metanephric glomerulus.
    GO:0072232    metanephric proximal convoluted tubule segment 2 development    The process whose specific outcome is the progression of the S2 portion of the metanephric proximal convoluted tubule over time, from its formation to the mature structure. The S2 portion of the metanephric proximal tubule is involved in reabsorption of water and sodium chloride.
    GO:0072230    metanephric proximal straight tubule development    The process whose specific outcome is the progression of the metanephric proximal straight tubule over time, from its formation to the mature structure. The metanephric proximal straight tubule is the part of the metanephric descending limb that extends from the metanephric proximal convoluted tubule to the metanephric descending thin tubule.
    GO:0043066    negative regulation of apoptotic process    Any process that stops, prevents, or reduces the frequency, rate or extent of cell death by apoptotic process.
    GO:0030185    nitric oxide transport    The directed movement of nitric oxide, nitrogen monoxide, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
    GO:0045766    positive regulation of angiogenesis    Any process that activates or increases angiogenesis.
    GO:0030335    positive regulation of cell migration    Any process that activates or increases the frequency, rate or extent of cell migration.
    GO:0048146    positive regulation of fibroblast proliferation    Any process that activates or increases the frequency, rate or extent of multiplication or reproduction of fibroblast cells.
    GO:0046878    positive regulation of saliva secretion    Any process that activates or increases the frequency, rate or extent of the regulated release of saliva.
    GO:0071805    potassium ion transmembrane transport    A process in which a potassium ion is transported from one side of a membrane to the other.
    GO:0006813    potassium ion transport    The directed movement of potassium ions (K+) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
    GO:0070295    renal water absorption    A renal system process in which water is taken up from the collecting ducts and proximal and distal loops of the nephron. In non-mammalian species, absorption may occur in related structures.
    GO:0003097    renal water transport    The directed movement of water (H2O) by the kidney.
    GO:0042493    response to drug    Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a drug stimulus. A drug is a substance used in the diagnosis, treatment or prevention of a disease.
    GO:0032940    secretion by cell    The controlled release of a substance by a cell.
    GO:0033363    secretory granule organization    A process that is carried out at the cellular level which results in the assembly, arrangement of constituent parts, or disassembly of a secretory granule. A secretory granule is a small subcellular vesicle, surrounded by a membrane, that is formed from the Golgi apparatus and contains a highly concentrated protein destined for secretion.
    GO:0019233    sensory perception of pain    The series of events required for an organism to receive a painful stimulus, convert it to a molecular signal, and recognize and characterize the signal. Pain is medically defined as the physical sensation of discomfort or distress caused by injury or illness, so can hence be described as a harmful stimulus which signals current (or impending) tissue damage. Pain may come from extremes of temperature, mechanical damage, electricity or from noxious chemical substances. This is a neurological process.
    GO:0035377    transepithelial water transport    The directed movement of water (H2O) from one side of an epithelium to the other.
    GO:0006810    transport    The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
    GO:0030104    water homeostasis    Any process involved in the maintenance of an internal steady state of water within an organism or cell.
    GO:0006833    water transport    The directed movement of water (H2O) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
    GO:0042060    wound healing    The series of events that restore integrity to a damaged tissue, following an injury.
cellular component
    GO:0045177    apical part of cell    The region of a polarized cell that forms a tip or is distal to a base. For example, in a polarized epithelial cell, the apical region has an exposed surface and lies opposite to the basal lamina that separates the epithelium from other tissue.
    GO:0016324    apical plasma membrane    The region of the plasma membrane located at the apical end of the cell.
    GO:0030424    axon    The long process of a neuron that conducts nerve impulses, usually away from the cell body to the terminals and varicosities, which are sites of storage and release of neurotransmitter.
    GO:0009925    basal plasma membrane    The region of the plasma membrane located at the basal end of the cell. Often used in reference to animal polarized epithelial membranes, where the basal membrane is the part attached to the extracellular matrix, or in plant cells, where the basal membrane is defined with respect to the zygotic axis.
    GO:0016323    basolateral plasma membrane    The region of the plasma membrane that includes the basal end and sides of the cell. Often used in reference to animal polarized epithelial membranes, where the basal membrane is the part attached to the extracellular matrix, or in plant cells, where the basal membrane is defined with respect to the zygotic axis.
    GO:0005903    brush border    The dense covering of microvilli on the apical surface of a epithelial cells in tissues such as the intestine, kidney, and choroid plexus; the microvilli aid absorption by increasing the surface area of the cell.
    GO:0031526    brush border membrane    The portion of the plasma membrane surrounding the brush border.
    GO:0032127    dense core granule membrane    The lipid bilayer surrounding a dense core granule.
    GO:0070062    extracellular exosome    A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
    GO:0016021    integral component of membrane    The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
    GO:0005887    integral component of plasma membrane    The component of the plasma membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
    GO:0016020    membrane    A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
    GO:0031965    nuclear membrane    Either of the lipid bilayers that surround the nucleus and form the nuclear envelope; excludes the intermembrane space.
    GO:0005634    nucleus    A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
    GO:0005886    plasma membrane    The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
    GO:0042383    sarcolemma    The outer membrane of a muscle cell, consisting of the plasma membrane, a covering basement membrane (about 100 nm thick and sometimes common to more than one fiber), and the associated loose network of collagen fibers.
    GO:0020003    symbiont-containing vacuole    Membrane-bounded vacuole within a host cell in which a symbiont organism resides. The vacuole membrane is derived from both the host and symbiont.

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1fqy AQUAPORIN-1 (1FQY) IS A SIMILAR PROTEIN SOLVED BY EM.