Anaerobic metabolism in the oyster heart ...
Previous studies indicate that the intertidal oyster, Crassostrea gigas, is a facultative anaerobe. The end-products of anaerobiosis in the oyster and in other intertidal bivalves are succinate and alanine. The production of these compounds is energetically advantageous over lactate production in th...
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| Format: | Text |
| Language: | English |
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University of British Columbia
2010
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| Online Access: | https://dx.doi.org/10.14288/1.0093179 https://doi.library.ubc.ca/10.14288/1.0093179 |
| Summary: | Previous studies indicate that the intertidal oyster, Crassostrea gigas, is a facultative anaerobe. The end-products of anaerobiosis in the oyster and in other intertidal bivalves are succinate and alanine. The production of these compounds is energetically advantageous over lactate production in that ATP-producing steps, other than those in glycolysis, appear to be coupled to succinate production. In this study, anoxia adaptations of the ventricle, a tissue with a high aerobic capacity, were examined. Two sources of energy are available to the anoxic ventricle : glycogen stores and a large free amino acid pool. ¹⁴C-labelled glucose, aspartate, and glutamate were tested as substrates of anaerobic metabolism in the isolated ventricle. Glucose and aspartate are readily metabolized by the anoxic ventricle. The major end-product of glucose metabolism is alanine while aspartate is metabolized mostly to succinate. Glutamate is a poor substrate of anaerobic metabolism. Correspondingly, the intracellular pool of ... |
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