biochem-lec29.txt

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Author:
smilipinz
ID:
246158
Filename:
biochem-lec29.txt
Updated:
2013-11-10 16:03:04
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biochem
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exam 3
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  1. What is the 2 component of proton-motive force?
    Chemical potential energy and Electrical potential energy
  2. Chemical Potential Energy
    Due to the difference in concentration of a chemical species (H+) separated by a membrane
  3. Electrical Potential Energy
    Results from a separation of charge across a membrane
  4. 2 basic postulates of Chemiosmotic model
    • 1. electrons flow through transport chain, Energy released create proton gradient across inner mitochon membrane
    • 2. protons move back across inner mitochon membrane release E that drive syntheses of ATP.
  5. Venturicidin or oligomycin
    Inhibitors of ATP synthase
  6. Dinitrophenol (DNP)
    Uncoupler, membrane soluble weak acid.
  7. ATP synthesis
    Can be synthesis in the absence of an oxidizable substrate, proton-motive force is sufficient to drive ATP synthesis
  8. ATP synthase
    Complex V. proton-translocating multisubunit, transmembrane protein.
  9. What are the 2 functional domain of ATP synthase?
    • F0: integral to membrane
    • F1: peripheral to the membrane
  10. ATP synthase F1 complex
    Each of the 3 beta subunit has one catalytic site for the ATP
  11. ATP synthase F0
    Make up the proton pore and is composed of subunit ab2c10-12
  12. What are the 2 specific systems that transport ADP and P into the mitochon matrix and ATP out to cytosol
    • 1. Adenine nucleotide translocase
    • 2. Phosphate translocase
  13. Malate-aspartate shuttle
    Primarily used by heart, kidney and liver. 2.5 ATP generated by pair of electrons that are passed from NADH to O2
  14. Glycerol 3-Phosphate shuttle
    Used by skeletal muscle and brain.
  15. How many ATP does G-3-P shuttle provide
    1.5 ATP molecule per pairs of electrons.

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