ppt2 - Metabolism Energy Redox Enzymes and Regulation...

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CEE444 1 Metabolism: Energy, Redox, Enzymes, and Regulation CEE444 2 Energy and Work energy ± capacity to do work or to cause particular changes Types of work carried out by organisms chemical work ± synthesis of complex molecules transport work ± take up of nutrients, elimination of wastes, and maintenance of ion balances mechanical work ± movement of organisms or cells and movement of internal structures
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CEE444 3 The processes used by organisms to obtain energy and to do chemical work are the basis of the functioning of ecosystems. CEE444 4 Energy currency of cells Adensoine Triphosphate (ATP) ± used to transfer energy from cell’s energy-conserving systems to the systems that carry out cellular work Adenine Ribose
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CEE444 5 Free Energy and Reactions Δ G = Δ H - T• Δ S expresses the change in energy that can occur in chemical reactions and other processes used to indicate if a reaction will proceed spontaneously Δ G ± free energy change ± amount of energy that is available to do work Δ H ± change in enthalpy (heat content) T ± temperature in Kelvin Δ S ± change in entropy CEE444 6 Chemical equilibrium equilibrium consider the chemical reaction A + B C + D ± reaction is at equilibrium when rate of forward reaction = rate of reverse reaction equilibrium constant ( K eq ) ± expresses the equilibrium concentrations of products and reactants to one another
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CEE444 7 Standard free energy change ( Δ G o ) free energy change defined at standard conditions of concentration, pressure, temperature, and pH Δ G o ± standard free energy change at pH 7 ± directly related to K eq Δ G o ’ = -2.303RT•log K eq CEE444 8 The relationship… Exergonic reactions A+B C+D Keq >1 Δ G o ’ is negative (reaction proceeds spontaneously) Endergonic reactions A+B C+D Keq < 1 Δ G o ’ is positive (reaction will not proceed spontaneously)
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CEE444 9 The Role of ATP in Metabolism exergonic breakdown of ATP is coupled with endergonic reactions to make them more favorable CEE444 10 The conversion is mediated by oxidation-reduction reactions and electron carriers
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CEE444 11 Oxidation-Reduction Reactions and
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This note was uploaded on 11/30/2010 for the course CEE CEE444 taught by Professor Wen-tsoliu during the Spring '10 term at University of Illinois, Urbana Champaign.

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ppt2 - Metabolism Energy Redox Enzymes and Regulation...

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