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The anaerobic oyster heart coupling of glucose and aspartate fermentation



The anaerobic oyster heart coupling of glucose and aspartate fermentation



Journal of Comparative Physiology B Metabolic and Transport Functions 115(2): 147-157



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

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DOI: 10.1007/bf00692526

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