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Insulin Receptor definitions

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  • Insulin
    Peptide hormone acting as a ligand, triggering biosignaling by binding to its membrane receptor without entering cells.
  • Insulin Receptor
    Membrane protein complex with four subunits, mediating insulin signaling as a receptor tyrosine kinase.
  • Receptor Tyrosine Kinase
    Class of membrane receptors with intrinsic kinase activity, phosphorylating tyrosine residues upon activation.
  • Alpha Subunit
    Extracellular component of the insulin receptor, responsible for ligand binding and linked by disulfide bonds.
  • Beta Subunit
    Transmembrane component of the insulin receptor, containing cytoplasmic tyrosine kinase domains for signal transduction.
  • Disulfide Bond
    Covalent linkage between cysteine residues, stabilizing the structure of the insulin receptor subunits.
  • Dimer
    Structural arrangement of two alpha-beta pairs in the insulin receptor, enabling immediate activation without further assembly.
  • Autophosphorylation
    Self-phosphorylation process of the insulin receptor's beta subunits, activating kinase domains for downstream signaling.
  • Tyrosine Residue
    Amino acid site within the insulin receptor and substrates, targeted for phosphorylation during signal activation.
  • Insulin Receptor Substrate
    Primary target protein of the activated insulin receptor, serving as a branch point in signaling pathways.
  • IRS-1
    Major adapter protein phosphorylated by the insulin receptor, facilitating diverse cellular responses.
  • Adapter Protein
    Protein lacking enzymatic activity, functioning as a bridge to assemble signaling complexes in insulin pathways.
  • Signal Transduction
    Cellular process converting extracellular insulin binding into intracellular responses via phosphorylation cascades.
  • Glucose Metabolism
    Cellular pathway regulated by insulin signaling, affecting uptake and utilization of glucose.
  • Gene Expression
    Cellular outcome modulated by insulin signaling, influencing transcriptional activity and cell growth.