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Published byBaldwin Gilbert Modified over 9 years ago
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3Glucose-6-P 3Ru5P + Gln F6P + E4P + R5P 3PG NH3 + 2 PEP + E4P + R5P + Serine Tryptophan + pyruvate + GAP + CO2
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Aldolase
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2-keto-3-deoxy-arabinoheptulosonate-7-phosphate synthase
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chorismate synthase
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Phenylalanine Tyrosine
Anthranilate Chorismate Prephenate p-hydroxybenzoate p-aminobenzoate Tryptophan Nictotinamide Phenylalanine Tyrosine Tetrahydrofolate Coenzyme Q
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+
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Ribose-5-phosphate Cost = 2 ATP
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3 glucose + 5NADP+ + 2NAD+ + 2ATP serine + glutamine --->
Tryptophan + 5NADPH + 2NADH + 2ADP + 2Pi + GAP + pyruvate + 4CO2 + glutamate glutamine costs NADPH + 2NH4+ + 2ATP GAP + glutamate + ATP + 2NADH = serine 3 glucose + 4NADP+ + 2NH4+ + 4NAD+ + ADP + Pi ---> Tryptophan + 4NADPH + 4NADH + ATP + pyruvate + 4CO2
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Chorismate mutase
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prephenate
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3 glucose + 2NAD+ + 4NADP+ + NH4+ + ATP --->
phenylalanine + R5P + 4NADPH + 2NADH + 4CO2 + ADP + Pi 3 glucose + 3NAD+ + 4NADP+ + NH4+ + ATP ---> tyrosine + R5P + 4NADPH + 3NADH + 4CO2 + ADP + Pi In animals tyrosine is made from phenylalanine by phenylalanine hydroxylase
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Tyrosine production from phenylalanine
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Tryptophan: indolamine-2,3-dioxygenase
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N-formylkynurenine formamidase
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N10-formyl-THF synthetase
Loss of ATP! N10-formyl-THF
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Kynurenine-3-hydroxylase (monooxygenase)
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Kynurenine 3-hydroxykynurenine
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Lose 1 NADPH!
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Kynureninase
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So…Trp = alanine - ATP - NADPH + 3-hydroxyanthranilate
If: Ala = 13 ATP Then: Trp = 12 ATP - NADPH + 3-hydroxyanthranilate
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3-hydroxyanthranilate dioxygenase
2-amino-3-carboxymuconate-6-semialdehyde 3-hydroxyanthranilate dioxygenase
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If you need nictotinamide it ends here
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Assume loss of NADH
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Trp = 12 ATP - 2 NADPH - (NADH?) + NADH + -ketoadipate + NH3
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-ketoadipate dehydrogenase Same mechanism as pyruvate dehydrogenase and -ketoglutarate dehydrogenase.
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-ketoadipate = NADH + glutaryl-CoA
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-ketoadipate = NADH + FADH2 + glutaconyl-CoA
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-ketoadipate = 2 NADH + FADH2 + Acetoacetyl-CoA
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-ketoadipate = 2 NADH + FADH2 + 2 Acetyl-CoA
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So…Trp = 12 ATP - 2 NADPH + NH3+ -ketoadipate
If: -ketoadipate = 2 NADH + FADH2 + 2 Acetyl-CoA If: Acetyl-CoA = 3 NADH + FADH2 + GTP Then: -ketoadipate = 8 NADH + 3 FADH2 + 2 GTP Then: Trp = 12 ATP + 8 NADH + 3 FADH2 + 2 GTP - 2 NADPH + NH3 Remember malate dehydrogenase + malic enzyme converts NADH + NADP+ ---> NAD+ + NADPH So….-2 NADPH = -2 NADH Then: Trp = 12 ATP + 6 NADH + 3 FADH2 + 2 GTP + NH3 If GTP = ATP, NADH = 3 ATP FADH2 = 2 ATP and NH3 = -2 ATP Then: Trp = 36 ATP + N10-formyl-THF
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Tyrosine and phenylalanine degradation
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Makes fumarate + acetoacetate at the expense of NADPH and ascorbate
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So…Phe = fumarate + acetoacetate - NADPH - Asc + NH3 and
Tyr = fumarate + acetoacetate - Asc + NH3 If: fumarate = malate Then: Phe = malate + acetoacetate - NADPH - Asc + NH3 and Tyr = malate + acetoacetate - Asc + NH3 If: malate = pyruvate - NADH + NADPH Then: Phe = pyruvate + acetoacetate - NADH - Asc + NH3 and Tyr = pyruvate + acetoacetate - Asc + NH3 - NADH + NADPH If: acetoacetate = 2 Acetyl-CoA - ATP Then: Phe = pyruvate + 2 Acetyl-CoA - NADH - Asc + NH3 -ATP and Tyr = pyruvate + 2 Acetyl-CoA - Asc + NH3 - NADH + NADPH - ATP If: pyruvate = 4 NADH + FADH2 + GTP If: Acetyl-CoA = 3 NADH + FADH2 + GTP Then: Phe = 9 NADH + 3 FADH2 + 2 GTP - Asc + NH3 and Tyr = NH3 + 2 GTP + 3 FADH2 + 9 NADH + NADPH - Asc
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If GTP = ATP, NADH = 3 ATP FADH2 = 2 ATP and NH3 = -2 ATP
Then: Phe = 9 NADH + 3 FADH2 + 2 GTP - Asc + NH3 and Tyr = NH3 + 2 GTP + 3 FADH2 + 9 NADH - NADPH - Asc If: Asc = - NADPH Then: Phe = 9 NADH + 3 FADH2 + 2 GTP - NADPH + NH3 and Tyr = NH3 + 2 GTP + 3 FADH2 + 9 NADH - 2 NADPH If: NADPH = NADH Then: Phe = 8 NADH + 3 FADH2 + 2 GTP + NH3 and Tyr = NH3 + 2 GTP + 3 FADH2 + 7 NADH If GTP = ATP, NADH = 3 ATP FADH2 = 2 ATP and NH3 = -2 ATP Then: Phe = 30 ATP Tyr = 27 ATP
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Histidine degradation
Ammonia lyase Urocanase Urocanase Urocanase Urocanase Urocanase
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formiminotransferase
Imidazolone propionase Glutamate formiminotransferase
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So….Histidine = glutamate + N5-formimino-THF
If: Glu = -ketoglutarate + NADPH + NH3 Then: His = -ketoglutarate + NADPH + NH3 If: -ketoglutarate = 4 NADH + 2 GTP + 2 FADH2 + NADPH Then: His = 4 NADH +2 GTP + 2 FADH2 + NADPH + NH3 If: NADH = 3 ATP GTP = ATP FADH2 = 2 ATP NH3 = -2 ATP Then: His = 16 ATP + NADPH + N5-formimino-THF
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Amino acids as precursors for biological molecules
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