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Oxidative Phosphorylation 4 definitions

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  • Protonmotive Force
    Electrochemical gradient across the inner mitochondrial membrane, combining charge and concentration differences to drive ATP production.
  • Electrochemical Gradient
    Difference in ion concentration and electrical charge across a membrane, crucial for cellular energy generation.
  • ATP Synthase
    Molecular motor enzyme with rotating subunits, catalyzing ATP formation from ADP and inorganic phosphate using proton flow.
  • F0 Portion
    Membrane-embedded segment of ATP synthase, responsible for rotation and proton translocation.
  • F1 Portion
    Soluble segment of ATP synthase containing alpha and beta subunits, where ATP synthesis occurs.
  • Gamma Subunit
    Central rotating component of ATP synthase, transmitting mechanical energy to induce conformational changes.
  • Beta Subunit
    Site within ATP synthase where substrate binding and ATP synthesis take place, cycling through open, loose, and tight states.
  • Adenine Nucleotide Translocase
    Antiporter protein exchanging ADP into and ATP out of the mitochondrial matrix, facilitating nucleotide balance.
  • Phosphate Translocase
    Symporter protein importing inorganic phosphate and protons into the mitochondrial matrix, utilizing the proton gradient.
  • Inner Mitochondrial Membrane
    Barrier hosting electron transport complexes and ATP synthase, essential for energy conversion processes.
  • Chemiosmotic Theory
    Concept explaining ATP generation via coupling of proton gradients and enzyme conformational changes.
  • Oxidative Phosphorylation
    Process of ATP production driven by electron transport and proton gradient, distinct from substrate-level phosphorylation.
  • Inorganic Phosphate
    Essential substrate for ATP synthesis, imported into mitochondria via specialized transporters.
  • Antiporter
    Transport protein exchanging two different molecules across a membrane in opposite directions.
  • Symporter
    Transport protein moving two molecules simultaneously in the same direction across a membrane.