FUNDAMENTALS OF BIOCHEMISTRY - LL FD
5th Edition
ISBN: 9781119598022
Author: Voet
Publisher: WILEY
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Chapter 20, Problem 13E
Summary Introduction
To determine: The number of rounds of β-oxidation that is required to produce butyrate.
Concept introduction: Beta-oxidation is a catabolic process in which fatty acid molecules are broken down to generate acetyl-CoA that enters the citric acid cycle. In the prokaryotes, fatty acid molecules are broken down in the cytosol and in the eukaryotes fatty acid molecules are broken down in the mitochondria. Butyrate is produced during the fermentation of feedstuffs in the rumen and it is readily absorbed by the rumen wall.
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The beta-lactamase hydrolyzes the lactam-ring in penicillin. Describe the mechanism
of hydrolysis, insuring to include the involvement of S, D, & K in the reaction sequence. Please help
To map the active site of beta-lactamase, the enzyme was hydrolyzed with trypsin to yield a hexapeptide (P1) with the following amino acids. Glu, Lys, Leu, Phe, Met, and Ser. Treatment of P1 with phenyl isothiocyanate yielded a PTH derivative of phenylalanine and a peptide (P2). Treatment of P1 with cyanogenbromide gave an acidic tetrapeptide (P3) and a dipeptide (P4).Treatment of P2 with 1-fluoro-2,4-dinitrobenzene, followed by complete hydrolysis, yields N-2,4-dinitrophenyl-Glu. P1, P2, and P3 contain the active site serine.
Why doesn't D in this hexapeptide not participate in the hydrolysis of the beta-lactam ring even though S, K, and D are involved in the catalyst?
To map the active site of -lactamase, the enzyme was hydrolyzed with trypsin to yield a hexapeptide (P1) with the following amino acids. Glu, Lys, Leu, Phe, Met, and Ser. Treatment of P1 with phenyl isothiocyanate yielded a PTH derivative of phenylalanine and a peptide (P2). Treatment of P1 with cyanogenbromide gave an acidic tetrapeptide (P3) and a dipeptide (P4).Treatment of P2 with 1-fluoro-2,4-dinitrobenzene, followed by complete hydrolysis, yields N-2,4-dinitrophenyl-Glu. P1, P2, and P3 contain the active site serine.
Using the experimental results described above derive the primary sequence of the active site hexapeptide. Please help!
Chapter 20 Solutions
FUNDAMENTALS OF BIOCHEMISTRY - LL FD
Ch. 20 - Prob. 1ECh. 20 - 2. Identify die products generated by the action...Ch. 20 - 3. (a) What is. the charge of bile acids in the...Ch. 20 - 4. Bacteria that live in the large intestine...Ch. 20 - Prob. 5ECh. 20 - 6. Adipocytes store fat in phospholipid-coaled...Ch. 20 - Prob. 7ECh. 20 - Prob. 8ECh. 20 - 9. The first three steps of ? oxidation (Fig....Ch. 20 - Prob. 10E
Ch. 20 - Prob. 11ECh. 20 - Prob. 12ECh. 20 - Prob. 13ECh. 20 - 14. Short chain fatty acids such as butyrate are...Ch. 20 - 15. Why are unsaturated fats preferable to...Ch. 20 - 16. Calculate the ATP yield for the complete...Ch. 20 - 17. Explain why the degradation of odd-chain fatty...Ch. 20 - Prob. 18ECh. 20 - 19. Why is it important that liver cells lack...Ch. 20 - 20. An animal is fed palmitate with a 14C-labeled...Ch. 20 - 21. On what cartoon atoms docs the 14CO2 used to...Ch. 20 - Prob. 22ECh. 20 - 23. Explain why adipocytes need glucose as well as...Ch. 20 - Prob. 24ECh. 20 - 25. Pharmacological inhibition of acetyl-CoA...Ch. 20 - 26. Explain why inhibiting the activity of...Ch. 20 - Prob. 27ECh. 20 - 28. An animal is fed palmitate with a 14C-labeled...Ch. 20 - Prob. 29ECh. 20 - Prob. 30ECh. 20 - Prob. 31CQCh. 20 - Prob. 32CQCh. 20 - 33. Digestion of plant materials generates...Ch. 20 - Prob. 34CQCh. 20 - 35. The tricarboxylate transport system supplies...Ch. 20 - Prob. 36CQCh. 20 - 37. Compare the energy cost, in ATP equivalents,...Ch. 20 - Prob. 38CQCh. 20 - Prob. 39CQCh. 20 - Prob. 40CQCh. 20 - Prob. 41CQCh. 20 - Prob. 42CQCh. 20 - Prob. 43CQCh. 20 - Prob. 1MTE
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