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Ubiquitination definitions

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  • Ubiquitin
    Small, highly conserved protein with 76 amino acids, found in all eukaryotes, used to tag other proteins for cellular regulation.
  • Isopeptide Bond
    Amide linkage formed between the carboxylate group of ubiquitin and the amino group of lysine's R-group, not part of protein backbone.
  • Proteasome
    Large protein complex specialized for proteolytic activity, breaking down tagged proteins into peptide fragments and amino acids.
  • Lysine
    Amino acid residue whose R-group is most susceptible to covalent attachment of ubiquitin during protein tagging.
  • Amide Linkage
    Covalent bond between a carbonyl group and a nitrogen atom, used in attaching ubiquitin to target proteins.
  • ATP
    Molecule providing energy required for the covalent attachment of ubiquitin to target proteins during ubiquitination.
  • Post-Translational Modification
    Cellular process occurring after protein synthesis, altering protein function or fate, such as ubiquitination.
  • Protein Degradation
    Cellular process where proteins are broken down into peptide fragments and amino acids, often following ubiquitin tagging.
  • Enzymatic Regulation
    Control of enzyme activity and reaction velocity, often achieved by decreasing protein concentration through ubiquitination.
  • Peptide Fragment
    Small pieces of proteins generated after proteasome-mediated breakdown of ubiquitin-tagged proteins.
  • Eukaryote
    Organism whose cells contain nuclei; ubiquitin is found in all members of this group, from yeast to humans.
  • Ubiquitin Chain
    Series of ubiquitin peptides covalently linked together on a target protein, marking it for degradation.
  • Cellular Regulation
    Maintenance and control of cellular processes, often achieved by modulating protein levels through ubiquitination.
  • Amino Acid Residue
    Individual building block of proteins; lysine residues are key sites for ubiquitin attachment.
  • Protein Concentration
    Amount of protein present in a cell, which is decreased by ubiquitination to regulate cellular activities.