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Inhibitory Adenylate Cyclase GPCR Signaling definitions

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  • Adenylate Cyclase
    Effector enzyme regulated by GPCRs, responsible for converting ATP into cAMP, with activity modulated by stimulatory and inhibitory G proteins.
  • GPCR
    Membrane receptor that detects extracellular signals and activates intracellular G proteins, initiating biosignaling cascades.
  • cAMP
    Secondary messenger produced from ATP by adenylate cyclase, crucial for transmitting signals within cells.
  • G Protein
    Intracellular protein complex activated by GPCRs, consisting of alpha, beta, and gamma subunits, mediating signal transduction.
  • Alpha Subunit
    Component of G protein that dissociates upon activation, directly influencing effector enzymes like adenylate cyclase.
  • GI
    Inhibitory alpha subunit of G protein that reduces adenylate cyclase activity, decreasing cAMP production.
  • GS
    Stimulatory alpha subunit of G protein that enhances adenylate cyclase activity, increasing cAMP production.
  • Beta Adrenergic GPCR
    Specific GPCR subtype involved in adenylate cyclase signaling, responsive to ligands like epinephrine.
  • BARK
    Kinase that phosphorylates ligand-bound beta adrenergic GPCRs, marking them for desensitization.
  • Beta Arrestin
    Protein that binds phosphorylated GPCRs, blocking G protein interaction and facilitating receptor endocytosis.
  • Desensitization
    Cellular process where response to persistent signals is reduced, even if the ligand remains present.
  • Endocytosis
    Mechanism by which GPCRs are internalized into the cell, making them temporarily inaccessible to extracellular ligands.
  • Ligand
    Molecule that binds to a receptor, such as a GPCR, triggering conformational changes and signaling events.
  • ATP
    Cellular energy molecule converted by adenylate cyclase into cAMP during signal transduction.
  • Phosphorylation
    Addition of phosphate groups to proteins, such as GPCRs, often altering their function or signaling capacity.