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Crystal structure of the selenocysteine synthase SelA from Aquifex aeolicus
Biology and Chemistry Report
  •   Structure Details   Hide

    Structure Keywords

    Keywords Transferase
    Text homodecamer, pentamer of dimers, fold-type I pyridoxal 5'-phosphate (PLP) dependent enzyme, L-seryl-tRNA(Sec) selenium transferase, selenocysteine synthesis, selenium metabolism, Transferase

    Polymeric Molecules

    Chain A,B,C,D,E
    Description L-seryl-tRNA(Sec) selenium transferase 
    Mutation K19A, K21A, K46A, K48A 
    Nonstandard Linkage no 
    Nonstandard Monomers yes 
    Polymer Type polypeptide(L) 
    Formula Weight 50927.8 
    Source Method genetically manipulated  
    Entity Name Selenocysteine synthase, Sec synthase, Selenocysteinyl-tRNA(Sec) synthase 

  •   Protein Details   Hide

    UniProtKB Information

    Chain SWS/UNP ID SWS/UNP Accession(s)
    A,B,C,D,E SELA_AQUAE O67140     

    EC, Associated Pathways and Catalytic Sites

    Chain(s) IUBMB KEGG BioCyc
    A B C D E      
    C: Cellular Location | F: Molecular Function | P: Biological Process
    Chain A,B,C,D,E
    GO ID   Ontology GO Term Definition
    1514   Selenocysteine Incorporation  The Incorporation of Selenocysteine Into a Peptide; Uses a Special TRNA That Recognizes the Uga Codon As Selenocysteine Rather Than As a Termination Codon. Selenocysteine Is Synthesized From Serine Before Its Incorporation; It Is Not a Posttranslational Modification of Peptidyl Cysteine. 
    6412   Translation  The Cellular Metabolic Process in Which a Protein Is Formed Using the Sequence of a Mature MRNA Molecule to Specify the Sequence of Amino Acids in a Polypeptide Chain. Translation Is Mediated by the Ribosome and Begins with the Formation of a Ternary Complex Between Aminoacylated Initiator Methionine TRNA GTP and Initiation Factor 2 Which Subsequently Associates with the Small Subunit of the Ribosome and an Mrna. Translation Ends with the Release of a Polypeptide Chain From the Ribosome. 
    97056   Selenocysteinyl Trna(sec) Biosynthetic Process  The Chemical Reactions and Pathways Resulting in the Formation of Selenocysteinyl Trna(sec). This Process Occurs Through the Following Steps: a Unique Serine TRNA with a Uga Recognizing Anticodon Is First Aminoacylated with Serine; This Is Then Phosphorylated by Phosphoseryl Trna[ser]sec Kinase; Lastly Selenium Is Swapped For the Phosphate On the Serine. 
    5737   Cytoplasm  All of the Contents of a Cell Excluding the Plasma Membrane and Nucleus But Including Other Subcellular Structures. 
    3824   Catalytic Activity  Catalysis of a Biochemical Reaction At Physiological Temperatures. in Biologically Catalyzed Reactions the Reactants Are Known As Substrates and the Catalysts Are Naturally Occurring Macromolecular Substances Known As Enzymes. Enzymes Possess Specific Binding Sites For Substrates and Are Usually Composed Wholly or Largely of Protein But RNA That Has Catalytic Activity (ribozyme) Is Often Also Regarded As Enzymatic. 
    4125   L Seryl Trnasec Selenium Transferase Activity  Catalysis of the Reaction: L Seryl Trna(sec) + Selenophosphate = L Selenocysteinyl Trna(sec) + H2o + Phosphate. 
    16740   Transferase Activity  Catalysis of the Transfer of a Group E.g. a Methyl Group Glycosyl Group Acyl Group Phosphorus Containing or Other Groups From One Compound (generally Regarded As the Donor) to Another Compound (generally Regarded As the Acceptor). Transferase Is the Systematic Name For Any Enzyme of EC Class 2. 

  •   Gene Details   Hide

    Genetic Source

    Chain A,B,C,D,E
    Scientific Name Aquifex aeolicus  
    Strain VF5
    Gene sela
    Host Scientific Name Escherichia coli  
    Host Strain Rosetta 2(de3)
    Host Vector Type Plasmid
    Host Plasmid Name pET25b

    Genome Information

    Chromosome Locus Gene ID Gene Name Symbol
    - - 1193774     selenocysteine synthase SELA