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The anaerobic oyster heart coupling of glucose and aspartate fermentation


Journal of Comparative Physiology B Metabolic and Transport Functions 115(2): 147-157
The anaerobic oyster heart coupling of glucose and aspartate fermentation
The interrelationships of carbohydrate and amino acid metabolism during anaerobiosis were investigated in the ventricle of the intertidal oyster, Crassostrea gigas. While the ventricle accumulates alanine and succinate in a 2:1 ratio during anoxia, these end products appear to arise from different precursors. 14C-glucose is metabolized mainly to 14C-alanine (55% of glucose carbon appears in alanine vs. 3% in succinate) by the anoxic ventricle in vitro while 14C-succinate is the principle end product of 14C aspartate-catabolism. 14C-glutamate is poorly metabolized by the anoxic ventricle, and correspondingly, while ventricular aspartate concentrations drop during anoxia, those of other amino acids do not. A metabolic scheme coupling glucose and aspartate catabolism in this faculative anaerobe is proposed. The detection of a 3rd, incompletely identified anaerobic end product produced by the ventricle is reported.

Accession: 006599756

DOI: 10.1007/bf00692526

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