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Facultative anaerobiosis inLimulus polyphemus:Phosphoenolpyruvate carboxy-kinase and heart activities

Authors
Journal
Comparative Biochemistry and Physiology Part B Comparative Biochemistry
0305-0491
Publisher
Elsevier
Publication Date
Volume
49
Issue
4
Identifiers
DOI: 10.1016/0305-0491(74)90261-2
Keywords
  • Bohr Effect
  • Facultative Anaerobiosis
  • Gluconeogenesis
  • Glycolysis
  • Hepatopancreas
  • Limulus Polyphemus
  • Oxalacetate
  • Phosphoenolpyruvate Carboxykinase
  • Pyruvate Kinase
Disciplines
  • Biology

Abstract

Abstract 1. 1. The horseshoe crab, Limulus polyphemus, can survive 36–60 hr at 22°C under virtually anoxic conditions. 2. 2. Phosphoeonolpyruvate carboxykinase (PEPCK) activity increased 2–3 times during the period of facultative anaerobiosis in both hepatopancreas and muscle tissue. 3. 3. Heart rates decreased to 25 per cent of the basal rate under these conditions, implying partial circulatory shutdown. 4. 4. No difference in survival was noted between organism exposed to acute anoxia or over a 24-hr acclimation period. 5. 5. Unlike the situation in the oyster or parasitic helminths (also capable of facultative anaerobiosis), PEPCK appears to be a mitochondrial enzyme and exhibits only slight cytosol activity. Evidence of facultative anaerobiosis in Limulus suggests an ability to adapt to oxygen-limited environments for short lengths of time.

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