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Overview of Cell Surface Receptors definitions

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  • Ion Channel Coupled Receptor
    Membrane protein that responds to ion gradients, converting chemical signals into electrical ones, crucial for nerve signaling.
  • G Protein-Coupled Receptor
    Membrane protein that, upon activation, triggers cytosolic G proteins, initiating a signaling cascade affecting various cellular targets.
  • Enzyme-Coupled Receptor
    Membrane protein with a cytosolic domain acting as an enzyme, often forming dimers and initiating intracellular signaling upon activation.
  • Ligand
    Extracellular molecule that binds to a receptor, triggering its activation and subsequent intracellular signaling events.
  • Protein Kinase
    Enzyme that adds phosphate groups to proteins, modulating their activity during signal transduction pathways.
  • Phosphatase
    Enzyme that removes phosphate groups from proteins, counteracting kinases and regulating protein function in signaling.
  • Second Messenger
    Small molecule generated downstream of receptor activation, propagating and amplifying intracellular signals.
  • Signal Transduction Pathway
    Series of molecular events where activated proteins sequentially relay and amplify signals, often ending in gene regulation.
  • Transcription Factor
    Protein activated at the end of signaling cascades, entering the nucleus to modulate gene expression.
  • Downregulation
    Cellular process where receptors are removed from the plasma membrane to decrease sensitivity to persistent external signals.
  • Dimer
    Complex formed by two receptor molecules, commonly seen in enzyme-coupled receptor activation.
  • Cytosol
    Intracellular fluid where G proteins and other signaling molecules operate following receptor activation.
  • Gene Expression
    Process influenced by signaling pathways, resulting in the activation or inhibition of specific genes.
  • Proliferation
    Cellular outcome regulated by signaling pathways, involving an increase in cell number through division.
  • Apoptosis
    Programmed cell death, which can be triggered by specific signaling cascades initiated at the cell surface.