Nucleotides Are Poor Sources Of Energy

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(a) What is the role of p-aminobenzoate in these bacteria? (Hint: See Fig. 18-16).

(b) Why does AICAR accumulate in the presence of sul-fanilamide?

(c) Why are the inhibition and accumulation reversed by addition of excess p-aminobenzoate?

12. Pathway of Carbon in Pyrimidine Biosynthesis

Predict the locations of 14C in orotate isolated from cells grown on a small amount of uniformly labeled [14C]succinate. Justify your prediction.

13. Nucleotides As Poor Sources of Energy Under starvation conditions, organisms can use proteins and amino acids as sources of energy. Deamination of amino acids produces carbon skeletons that can enter the glycolytic pathway and the citric acid cycle to produce energy in the form of ATP. Nucleotides, on the other hand, are not similarly degraded for use as energy-yielding fuels. What observations about cellular physiology support this statement? What aspect of the structure of nucleotides makes them a relatively poor source of energy?

14. Treatment of Gout Allopurinol (see Fig. 22-47), an inhibitor of xanthine oxidase, is used to treat chronic gout. Explain the biochemical basis for this treatment. Patients treated with allopurinol sometimes develop xanthine stones in the kidneys, although the incidence of kidney damage is much lower than in untreated gout. Explain this observation in the light of the following solubilities in urine: uric acid, 0.15 g/L; xanthine, 0.05 g/L; and hypox-anthine, 1.4 g/L.

15. Inhibition of Nucleotide Synthesis by Azaserine

The diazo compound 0-(2-diazoacetyl)-L-serine, known also as azaserine (see Fig. 22-48), is a powerful inhibitor of glut-amine amidotransferases. If growing cells are treated with azaserine, what intermediates of nucleotide biosynthesis would accumulate? Explain.

Structure Azaserine

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  • amethyst
    What aspect of the structure of nucleotides makes them a relatively poor source of energy?
    8 years ago
  • merico
    Why does aicar accumulate in the presence of sulfanamide?
    8 years ago
  • jan
    Why are nucleoties a poor source of energy during starvation?
    8 years ago
  • muhammed
    What aspect of the structure of nuclotide makes them poor source of energy?
    3 years ago
  • Vincent Anderson
    Why are nucleitides poor energy source?
    3 years ago
  • joonas pelkonen
    What makes nucleotides a poor energt source?
    2 years ago
  • Michelle Nussbaum
    Why are nucleotide a poor source of energy in the metabolic system?
    2 years ago
  • tess
    What aspect ofthe structure of nucleotide make them poor sourcest of energy?
    2 years ago
  • Lalia Boffin
    Why are nucletides poor energy sources?
    8 months ago

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