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Related Experiment Videos

Is a urea cycle present in insects?

R Pant, S Kumar

    The Biochemical Journal
    |July 15, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Carnivorous insects like Sarcophaga ruficornis possess urea-cycle enzymes, unlike phytophagous insects. This suggests the Krebs-Henseleit urea cycle operates in S. ruficornis, with arginase also aiding proline biosynthesis.

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    Area of Science:

    • Biochemistry
    • Insect Physiology
    • Metabolic Pathways

    Background:

    • Urea-cycle enzymes are crucial for nitrogenous waste excretion in many organisms.
    • The presence and activity of these enzymes can vary significantly across insect species and diets.
    • Arginase (L-arginine ureohydrolase, EC 3.5.3.1) is a key enzyme in the urea cycle.

    Purpose of the Study:

    • To investigate the presence and activity of urea-cycle enzymes in the carnivorous insect Sarcophaga ruficornis.
    • To compare enzyme activity profiles with the phytophagous eri silkworm Philosamia ricini.
    • To explore the potential role of arginase in proline biosynthesis in insects.

    Main Methods:

    • Enzyme assays were performed on tissue samples of Sarcophaga ruficornis throughout its life cycle.

    Related Experiment Videos

  • Enzyme activity of arginase and ornithine delta-transaminase (L-ornithine-2-oxo acid aminotransferase, EC 2.6.1.13) was measured.
  • Proteolytic activity, protein content, and arginine levels were analyzed.

    • Main Results:

    • Sarcophaga ruficornis exhibited significant activity of urea-cycle enzymes, unlike Philosamia ricini which only showed arginase activity.
    • Enzyme activity varied across the life cycle of S. ruficornis, suggesting the operation of the Krebs-Henseleit urea cycle.
    • Arginase and ornithine delta-transaminase showed parallel activity patterns, indicating a potential role for arginase in proline biosynthesis.
    • High proteolytic activity correlated with protein depletion and increased arginine levels, suggesting protein and peptide degradation.

    Conclusions:

    • The presence and variation of urea-cycle enzymes in S. ruficornis indicate the functional operation of the Krebs-Henseleit urea cycle in this carnivorous insect.
    • Arginase likely plays a dual role in both urea excretion and proline biosynthesis in insects.
    • The study highlights significant differences in nitrogen metabolism between carnivorous and phytophagous insects.