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. 1974 Apr;71(4):1056–1060. doi: 10.1073/pnas.71.4.1056

The Explanation for the Blockade of Glycolysis in Early Mouse Embryos

Elizabeth K Barbehenn 1, Raymond G Wales 1, Oliver H Lowry 1
PMCID: PMC388161  PMID: 4275392

Abstract

The reason for the failure of early-stage mouse embryos to grow on glucose alone was investigated by measurement of glucose-6-phosphate, fructose-1,6-bisphosphate plus triose phosphates, citrate, and malate in individual embryos during starvation and refeeding with glucose or glucose plus pyruvate. The results indicate a block at the 6-phosphofructokinase (EC 2.7.1.11) step at early stages, which is later removed. Although there seems to be no early difficulty in phosphorylation of glucose, maximum glucose-6-phosphate levels (and probably fructose-6-phosphate levels) are much lower at early stages than at later stages. The increase in fructose-6-phosphate with age may be the major cause of the increase in 6-phosphofructokinase activity. Unusually high citrate levels at all ages may help to keep this enzyme strongly inhibited until the increase in fructose-6-phosphate occurs. The changes in metabolite levels also indicate an early defect in mobilization of glycogen and a probably less important defect in the citrate cycle.

Keywords: metabolite levels, 6-phosphofructokinase, glucose phosphorylation

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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