Lec 5 - BIBC 102 Metabolic Biochemistry Winter 2007 Lecture...

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BIBC 102 Metabolic Biochemistry Winter 2007 Lecture 5, January 19, 2007 I.E. Scheffler
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Types of Organic Reactions 1) Group transfer Glucose + ATP Glu-6-P + ADP H 2 O + ATP P i + ADP 2) Oxidation-reduction reactions Ethanol + NAH + acetaldehyde + NADH + H + 3) Eliminations, isomerizations, rearrangements aldose ketose 4) reactions involving making or breaking of C-C bonds Fru-1,6, bisphosphate dihydroxyacetone-phosphate + glyceraldehyde-3phosphate
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Biochemical reactions are subject to the laws of thermodynamics
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A + B C + D G = 0 at equilibrium
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Gas constant R = 8.313 J/mol . K = 1.987 cal/mol . K 1 cal = 4.184 J at 25 o C RT = 2.497 kJ/mol
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Many reactions in biological systems are by themselves not energetically favored ( G > 0) they have to be “ pushed 1. By changing concentrations of reactants 2. By coupling them to energy releasing reactions 3. enzymatic mechanisms are designed to accomplish this
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1) A P 1 G 1 o > 0 2) B P 2
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Lec 5 - BIBC 102 Metabolic Biochemistry Winter 2007 Lecture...

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