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Crystal structure of the 46kDa domain of human cardiac troponin in the Ca2+ saturated form
Biology and Chemistry Report
1J1D
  •   Structure Details   Hide

    Structure Keywords

    Keywords CONTRACTILE PROTEIN
    Text Thin filament, muscle regulation, Ca2+ binding protein, EF-hand, coiled-coil, CONTRACTILE PROTEIN

    Polymeric Molecules

    Chain A,D
    Description Troponin C 
    Mutation C35S, C84S 
    Nonstandard Linkage no 
    Nonstandard Monomers no 
    Polymer Type polypeptide(L) 
    Formula Weight 18401.5 
    Source Method genetically manipulated  
    Entity Name TNC 
    Chain B,E
    Description Troponin T 
    Fragment CNBR fragment, residues 183-288 
    Nonstandard Linkage no 
    Nonstandard Monomers no 
    Polymer Type polypeptide(L) 
    Formula Weight 12842.9 
    Source Method genetically manipulated  
    Entity Name TnT 
    Chain C,F
    Description Troponin I 
    Fragment Residues 31-163 
    Mutation T31M, C80A, C97A 
    Nonstandard Linkage no 
    Nonstandard Monomers no 
    Polymer Type polypeptide(L) 
    Formula Weight 15191.8 
    Source Method genetically manipulated  
    Entity Name TNI 

    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,D TNNC1_HUMAN O14800     
    B,E TNNT2_HUMAN A2TDB9     
    C,F TNNI3_HUMAN P19429     

    Keywords and Names

    Chain(s) RCSB Name UniProtKB Name UniProtKB Keywords

    C: Cellular Location | F: Molecular Function | P: Biological Process
    Chain A,D
    GO ID   Ontology GO Term Definition
    2086   Diaphragm Contraction  A Process in Which Force Is Generated Within Involuntary Skeletal Muscle Tissue Resulting in a Change in Muscle Geometry. This Process Occurs in the Diaphragm. Force Generation Involves a Chemo Mechanical Energy Conversion Step That Is Carried Out by the Actin/myosin Complex Activity Which Generates Force Through ATP Hydrolysis. the Diaphragm Is a Striated Muscle That Is Necessary For the Process of Respiratory Gaseous Exchange. 
    6937   Regulation of Muscle Contraction  Any Process That Modulates the Frequency Rate or Extent of Muscle Contraction. 
    10038   Response to Metal Ion  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 Metal Ion Stimulus. 
    30049   Muscle Filament Sliding  The Sliding of Actin Thin Filaments and Myosin Thick Filaments Past Each Other in Muscle Contraction. This Involves a Process of Interaction of Myosin Located On a Thick Filament with Actin Located On a Thin Filament. During This Process ATP Is Split and Forces Are Generated. 
    32972   Regulation of Muscle Filament Sliding Speed  Any Process That Modulates the Velocity of Muscle Filament Sliding. 
    43462   Regulation of Atpase Activity  Any Process That Modulates the Rate of ATP Hydrolysis by an Atpase. 
    55010   Ventricular Cardiac Muscle Tissue Morphogenesis  The Process in Which the Anatomical Structures of Cardiac Ventricle Muscle Is Generated and Organized. 
    60048   Cardiac Muscle Contraction  Muscle Contraction of Cardiac Muscle Tissue. 
    5654   Nucleoplasm  That Part of the Nuclear Content Other Than the Chromosomes or the Nucleolus. 
    5739   Mitochondrion  A Semiautonomous Self Replicating Organelle That Occurs in Varying Numbers Shapes and Sizes in the Cytoplasm of Virtually All Eukaryotic Cells. It Is Notably the Site of Tissue Respiration. 
    5829   Cytosol  The Part of the Cytoplasm That Does Not Contain Organelles But Which Does Contain Other Particulate Matter Such As Protein Complexes. 
    5861   Troponin Complex  A Complex of Accessory Proteins (typically Troponin T Troponin I and Troponin C) Found Associated with Actin in Muscle Thin Filaments; Involved in Calcium Regulation of Muscle Contraction. 
    15629   Actin Cytoskeleton  The Part of the Cytoskeleton (the Internal Framework of a Cell) Composed of Actin and Associated Proteins. Includes Actin Cytoskeleton Associated Complexes. 
    43292   Contractile Fiber  Fibers Composed of Actin Myosin and Associated Proteins Found in Cells of Smooth or Striated Muscle. 
    5509   Calcium Ion Binding  Interacting Selectively and Non Covalently with Calcium Ions (ca2+). 
    5515   Protein Binding  Interacting Selectively and Non Covalently with Any Protein or Protein Complex (a Complex of Two or More Proteins That May Include Other Nonprotein Molecules). 
    31013   Troponin I Binding  Interacting Selectively and Non Covalently with Troponin I the Inhibitory Subunit of the Troponin Complex. 
    31014   Troponin T Binding  Interacting Selectively and Non Covalently with Troponin T the Tropomyosin Binding Subunit of the Troponin Complex. 
    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. 
    48306   Calcium Dependent Protein Binding  Interacting Selectively and Non Covalently with Any Protein or Protein Complex (a Complex of Two or More Proteins That May Include Other Nonprotein Molecules) in the Presence of Calcium. 
    51015   Actin Filament Binding  Interacting Selectively and Non Covalently with an Actin Filament Also Known As F Actin a Helical Filamentous Polymer of Globular G Actin Subunits. 
    Chain B,E
    GO ID   Ontology GO Term Definition
    6937   Regulation of Muscle Contraction  Any Process That Modulates the Frequency Rate or Extent of Muscle Contraction. 
    5861   Troponin Complex  A Complex of Accessory Proteins (typically Troponin T Troponin I and Troponin C) Found Associated with Actin in Muscle Thin Filaments; Involved in Calcium Regulation of Muscle Contraction. 
    Chain C,F
    GO ID   Ontology GO Term Definition
    5861   Troponin Complex  A Complex of Accessory Proteins (typically Troponin T Troponin I and Troponin C) Found Associated with Actin in Muscle Thin Filaments; Involved in Calcium Regulation of Muscle Contraction. 


     
  •   Gene Details   Hide

    Genetic Source

    Chain C,F
    Common Name Human
    Scientific Name Homo sapiens  
    Genus Homo
    Tissue Cardiac Muscle
    Host Scientific Name Escherichia coli  
    Host Genus Escherichia
    Host Strain Bl21(de3)plyss
    Host Vector Type Plasmid
    Host Plasmid Name pET3d


    Chain B,E
    Common Name Human
    Scientific Name Homo sapiens  
    Genus Homo
    Tissue Cardiac Muscle
    Host Scientific Name Escherichia coli  
    Host Genus Escherichia
    Host Strain Bl21(de3)plyss
    Host Vector Type Plasmid
    Host Plasmid Name pET3d


    Chain A,D
    Common Name Human
    Scientific Name Homo sapiens  
    Genus Homo
    Tissue Cardiac Muscle
    Host Scientific Name Escherichia coli  
    Host Genus Escherichia
    Host Strain Bl21(de3)plyss
    Host Vector Type Plasmid
    Host Plasmid Name pET3d


    Genome Information

    Chromosome Locus Gene ID Gene Name Symbol
    1 1q32 7139     troponin T type 2 (cardiac) TNNT2    
    3 3p21.1 7134     troponin C type 1 (slow) TNNC1    
    19 19q13.4 7137     troponin I type 3 (cardiac) TNNI3    

    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
    rs143020831 LS-SNP   dbSNP   A 102 R - > HL Helix 19% (Intermediate) 3 52485772
    rs200296115 LS-SNP   dbSNP   A 119 I - > T Helix 50% (Exposed) 3 52485505
    rs187586878 LS-SNP   dbSNP   A 141 D - > E Coil 7% (Buried) 3 52485438 CA
    rs142759728 LS-SNP   dbSNP   A 145 D - > N Bend 40% (Exposed) 3 52485428 CA
    rs104893823 LS-SNP   dbSNP   A 159 G - > D Turn 40% (Exposed) 3 52485301
    rs200720341 LS-SNP   dbSNP   C 48 Q - > L Helix 33% (Intermediate) 19 55667978
    rs3729712 LS-SNP   dbSNP   C 79 R - > C Helix 38% (Exposed) 19 55667616
    rs77615401 LS-SNP   dbSNP   C 82 P - > S Coil 70% (Exposed) 19 55667607
    rs184709702 LS-SNP   dbSNP   C 119 T - > N Helix 51% (Exposed) 19 55666125
    rs104894724 LS-SNP   dbSNP   C 145 R - > GW Coil 110% (Exposed) 19 55665514