4_17_09 TCA Cycle_links_energy_balance

4_17_09 TCA Cycle_links_energy_balance - Berg Tymoczko...

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Biochemistry Sixth Edition Chapter 17: The Citric Acid Cycle Copyright © 2007 by W. H. Freeman and Company   Berg • Tymoczko • Stryer
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Biochemistry Sixth Edition Chapter 23: Protein Turnover and Amino Acid Catabolism Copyright © 2007 by W. H. Freeman and Company   Berg • Tymoczko • Stryer
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Bond a is labilized by aminotransferases Bond b is labilized by decarboxylases Bond c is labilized by aldolases
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Schiff bases are formed The protonated form of PLP acts as an electron sink i.e. Electrons in the intermediates are attracted to the positive charge of the ring nitrogen The product Schiff base is cleaved at the completion of the reaction
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Serine can be deaminated directly to pyruvate by serine dehydratase (similarly threonine dehydratase can be deaminated directly to α keto-butyrate, en route to Succinyl CoA)
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During prolonged fasting branched-chain amino acids are used for fuel
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Biochemistry Sixth Edition Chapter 24: The Biosynthesis of Amino Acids Copyright © 2007 by W. H. Freeman and Company   Berg • Tymoczko • Stryer
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Glutamate Dehydrogenase Generates L form of glutamate
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The NAD(P)H must deliver the hydride in the L conformation.
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4_17_09 TCA Cycle_links_energy_balance - Berg Tymoczko...

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