Biochem6 - ENERGY We need energy to do things such as biosynthesis work(muscle contraction etc Chemical reactions enzymes and kinetics

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ENERGY We need energy to do things, such as biosynthesis, work (muscle contraction, etc) •Chemical reactions enzymes and kinetics thermodynamics •Metabolism - getting energy from fuel (food)! The energy “star” is ATP! Figure 6-5 ATP…the “energy molecule” THERMODYNAMICS Thermodynamics tells us what is possible given an infinite amount of time….what will happen at “equilibrium” Some reactions proceed spontaneously “exergonic”; energy is released Some reactions are not spontaneous “endergonic”; energy is required Figure 6-3 Exergonic and endergonic chemical reactions
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What if there is a reaction that we really need……but it is endergonic? Like: AA1 + AA2 --> AA1-AA2 ! G= +4 kcal/mole ATP --> ADP + Pi ! G= -7 kcal/mole AA1 + AA2 + ATP --> AA1-AA2 + ADP + Pi ! G= +3 kcal/mole We can add energy into the reaction…like having a bulldozer push a boulder up a hill! This is a “coupled reaction” Figure 6-7 Coupling of ATP Hydrolysis to an Endergonic Rxn Figure 6-6 Coupling of Chemical Reactions A view of the big picture A more realistic look at chemical reactions Let’s talk about chemical “kinetics” the rates at which reactions occur All related to “activation energy”
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Figure 6-8 Activation energy initiates reactions The rate at which a reaction proceeds depends upon how big of an activation energy it must overcome So, even if the overall energetics are favorable (i.e.,
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This note was uploaded on 10/08/2010 for the course MCDB MCDB 1A taught by Professor Senghuilow during the Summer '09 term at UCSB.

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Biochem6 - ENERGY We need energy to do things such as biosynthesis work(muscle contraction etc Chemical reactions enzymes and kinetics

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