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STRUCTURAL STUDIES OF METAL BINDING BY INOSITOL MONOPHOSPHATASE: EVIDENCE FOR TWO-METAL ION CATALYSIS
Biology and Chemistry Report
1IME
  •   Structure Details   Hide

    Structure Keywords

    Keywords HYDROLASE
    Text HYDROLASE

    Polymeric Molecules

    Chain A,B
    Description INOSITOL MONOPHOSPHATASE 
    Nonstandard Linkage no 
    Nonstandard Monomers no 
    Polymer Type polypeptide(L) 
    Formula Weight 30220.0 
    Source Method genetically manipulated  

    Ligands and Prosthetic Groups

    ID Name Chemical Formula Weight Ligand Structure
    CA  CALCIUM ION  Ca   40.08  View 
     
  •   Protein Details   Hide

    UniProtKB Information

    Chain SWS/UNP ID SWS/UNP Accession(s)
    A,B IMPA1_HUMAN B2R733     

    Keywords and Names

    Chain(s) RCSB Name UniProtKB Name UniProtKB Keywords

    EC, Associated Pathways and Catalytic Sites

    Chain(s) IUBMB KEGG BioCyc Catalytic Site(s)
    A B  3.1.3.25        
    C: Cellular Location | F: Molecular Function | P: Biological Process
    Chain A,B
    GO ID   Ontology GO Term Definition
    6021   Inositol Biosynthetic Process  The Chemical Reactions and Pathways Resulting in the Formation of Inositol 1 2 3 4 5 6 Cyclohexanehexol a Growth Factor For Animals and Microorganisms. 
    6661   Phosphatidylinositol Biosynthetic Process  The Chemical Reactions and Pathways Resulting in the Formation of Phosphatidylinositol Any Glycophospholipid in Which the Sn Glycerol 3 Phosphate Residue Is Esterified to the 1 Hydroxyl Group of 1d Myo Inositol. 
    6796   Phosphate Containing Compound Metabolic Process  The Chemical Reactions and Pathways Involving the Phosphate Group the Anion or Salt of Any Phosphoric Acid. 
    7165   Signal Transduction  The Cellular Process in Which a Signal Is Conveyed to Trigger a Change in the Activity or State of a Cell. Signal Transduction Begins with Reception of a Signal (e.g. a Ligand Binding to a Receptor or Receptor Activation by a Stimulus Such As Light) or For Signal Transduction in the Absence of Ligand Signal Withdrawal or the Activity of a Constitutively Active Receptor. Signal Transduction Ends with Regulation of a Downstream Cellular Process E.g. Regulation of Transcription or Regulation of a Metabolic Process. Signal Transduction Covers Signaling From Receptors Located On the Surface of the Cell and Signaling Via Molecules Located Within the Cell. For Signaling Between Cells Signal Transduction Is Restricted to Events At and Within the Receiving Cell. 
    43647   Inositol Phosphate Metabolic Process  The Chemical Reactions and Pathways Involving Inositol Phosphate 1 2 3 4 5 6 Cyclohexanehexol with One or More Phosphate Groups Attached. 
    44281   Small Molecule Metabolic Process  The Chemical Reactions and Pathways Involving Small Molecules Any Low Molecular Weight Monomeric Non Encoded Molecule. 
    46854   Phosphatidylinositol Phosphorylation  The Process of Introducing One or More Phosphate Groups Into a Phosphatidylinositol Any Glycerophosphoinositol Having One Phosphatidyl Group Esterified to One of the Hydroxy Groups of Inositol. 
    46855   Inositol Phosphate Dephosphorylation  The Process of Removing a Phosphate Group From Any Mono or Polyphosphorylated Inositol. 
    5737   Cytoplasm  All of the Contents of a Cell Excluding the Plasma Membrane and Nucleus But Including Other Subcellular Structures. 
    5829   Cytosol  The Part of the Cytoplasm That Does Not Contain Organelles But Which Does Contain Other Particulate Matter Such As Protein Complexes. 
    70062   Extracellular Vesicular Exosome  A Membrane Bounded Vesicle That Is Released Into the Extracellular Region by Fusion of the Limiting Endosomal Membrane of a Multivesicular Body with the Plasma Membrane. 
    287   Magnesium Ion Binding  Interacting Selectively and Non Covalently with Magnesium (mg) Ions. 
    8934   Inositol Monophosphate 1 Phosphatase Activity  Catalysis of the Reaction: Myo Inositol 1 Phosphate + H2o = Myo Inositol + Phosphate. 
    16787   Hydrolase Activity  Catalysis of the Hydrolysis of Various Bonds E.g. C O C N C C Phosphoric Anhydride Bonds Etc. Hydrolase Is the Systematic Name For Any Enzyme of EC Class 3. 
    30145   Manganese Ion Binding  Interacting Selectively and Non Covalently with Manganese (mn) Ions. 
    31403   Lithium Ion Binding  Interacting Selectively and Non Covalently with Lithium Ions (li+). 
    42802   Identical Protein Binding  Interacting Selectively and Non Covalently with an Identical Protein or Proteins. 
    42803   Protein Homodimerization Activity  Interacting Selectively and Non Covalently with an Identical Protein to Form a Homodimer. 
    46872   Metal Ion Binding  Interacting Selectively and Non Covalently with Any Metal Ion. 
    52832   Inositol Monophosphate 3 Phosphatase Activity  Catalysis of the Reaction: Myo Inositol 3 Phosphate + H2o = Myo Inositol + Phosphate. 
    52833   Inositol Monophosphate 4 Phosphatase Activity  Catalysis of the Reaction: Myo Inositol 4 Phosphate + H2o = Myo Inositol + Phosphate. 
    52834   Inositol Monophosphate Phosphatase Activity  Catalysis of the Reaction: Myo Inositol Phosphate + H2o = Myo Inositol + Phosphate. 


     
  •   Gene Details   Hide

    Genetic Source

    Chain A,B
    Common Name Human
    Scientific Name Homo sapiens  
    Genus Homo
    Organ Brain
    Gene cdna


    Genome Information

    Chromosome Locus Gene ID Gene Name Symbol
    8 8q21.13-q21.3 3612     inositol(myo)-1(or 4)-monophosphatase 1 IMPA1    

    Single Nucleotide Polymorphisms (from LS-SNP database)

    SNP ID LsSnp Link dbSNP Link Chain PDB position Amino acid changes Secondary structure Solvent Accessibility Chromosome Chromosome position Ligand
    rs61755740 LS-SNP   dbSNP   A 39 P - > S Turn 60% (Exposed) 8 82592967
    rs61755741 LS-SNP   dbSNP   A 46 T - > M Helix 13% (Intermediate) 8 82592945
    rs150137136 LS-SNP   dbSNP   A 62 Y - > H Coil 9% (Intermediate) 8 82592898
    rs141750319 LS-SNP   dbSNP   A 78 K - > N Coil 79% (Exposed) 8 82591429
    rs200237076 LS-SNP   dbSNP   A 83 D - > N Bend 50% (Exposed) 8 82591416
    rs147011930 LS-SNP   dbSNP   A 84 N - > S Bend 39% (Exposed) 8 82591412
    rs11549154 LS-SNP   dbSNP   A 85 P - > H Coil 17% (Intermediate) 8 82591409
    rs190992389 LS-SNP   dbSNP   A 88 I - > V Beta Ladder 0% (Buried) 8 82591401
    rs142316043 LS-SNP   dbSNP   A 98 F - > Y Helix 0% (Buried) 8 82591370
    rs204781 LS-SNP   dbSNP   A 109 I - > V Beta Ladder 0% (Buried) 8 82588492
    rs61734512 LS-SNP   dbSNP   A 154 I - > V 3/10 Helix 6% (Buried) 8 82583280
    rs148950764 LS-SNP   dbSNP   A 168 T - > I Coil 58% (Exposed) 8 82583237
    rs145775263 LS-SNP   dbSNP   A 188 H - > R Bend 10% (Intermediate) 8 82583177
    rs149824165 LS-SNP   dbSNP   A 205 T - > A Helix 21% (Intermediate) 8 82572856
    rs200934912 LS-SNP   dbSNP   A 219 W - > R Helix 6% (Buried) 8 82572814
    rs202127208 LS-SNP   dbSNP   A 220 D - > G Helix 13% (Intermediate) 8 82572810 CA
    rs202089380 LS-SNP   dbSNP   A 234 V - > M Beta Ladder 31% (Intermediate) 8 82572769
    rs146624224 LS-SNP   dbSNP   A 252 A - > V Beta Ladder 0% (Buried) 8 82571665