Micro303Lecture14

Mo8ve force p a chemical gradient ph and an electrical

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Unformatted text preview: rved by the cell either as ATP synthesis or as ion mo8ve force Chemical energy storage •  Some chemicals that func8on to store and release energy •  The energy stored in these chemicals can be used to fuel other cellular reac8ons that require energy ATP stores chemical energy ATP synthesis ATP hydrolysis Other ways to store energy PEP CoA Acetyl ­P Membrane energy storage: the ion mo8ve force (Δp) A chemical gradient (ΔpH) and an electrical gradient (Δψ) Usually protons, but also sodium in some organisms H+ Out In H+ H+ H+ H+ H+ H+ H+ The proton mo8ve force can be used for mul8ple purposes Energy storage systems Ared Box Aox Bred Direct ATP synthesis Storage in ion gradient ATP made by Substrate level phosphoryla8on ATP made by Oxida8ve phosphoryla8on Pathways for “genera8ng” energy •  Substrate ­level phosphoryla8on (SLP) –  Synthesis of ATP from ADP is directly coupled to metabolism of energy rich molecule •  Oxida8ve phosphoryla8on (OP) –  Electron transport generates an ion mo8ve force across the membrane and this is used to make ATP •  Photophosphoryla8on (PP) –  Light energizes electron for electron transport, then same as OP above Substrate level phosphoryla8on The electron transport system generates an ion mo8ve for...
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