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. 1965 Feb;94(2):436–445. doi: 10.1042/bj0940436

Fructose 1,6-diphosphatase in striated muscle

H A Krebs 1, Muriel Woodford 1
PMCID: PMC1206525  PMID: 14346089

Abstract

1. The occurrence of fructose diphosphatase in muscle tissue was investigated with reference to the question whether lactate can be converted into glycogen in muscle, as postulated by Meyerhof (1930), fructose diphosphatase being one of the enzymes required for this conversion. 2. Fructose diphosphatase was found in skeletal muscle of man, dog, cat, rat, mouse, rabbit, guinea pig, cattle, sheep, pigeon, fowl and frog. Under the test conditions between 5 and 60 μmoles of substrate were split/g. fresh wt./hr. at 22°. 3. Like liver fructose diphosphatase, the muscle enzyme is inhibited by substrate concentrations above 0·1 mm, by AMP and by trace quantities of Zn2+, Fe2+ and Fe3+; it is `activated' by EDTA. Inhibitions by the above agents may account for the failure of previous authors to detect the enzyme. 4. Heart muscle of several vertebrate species and the smooth muscle of pigeon and fowl gizzard had no measurable activity. 5. The presence of fructose diphosphatase and the virtual absence of the enzyme systems converting pyruvate into phosphopyruvate means that lactate and pyruvate cannot be converted into glycogen in muscle, whereas the phosphorylated C3 compounds can. The reconversion into carbohydrate of lactate (which readily diffuses out of muscle) occurs in liver and kidney only. The reconversion of phosphorylated C3 intermediates (which cannot diffuse out of the tissue) can occur only within the muscle. 6. α-Glycerophosphate is probably the main intermediate requiring conversion into glycogen. The possible role of α-glycerophosphate formation in vertebrate muscle, already well established in insect muscle, is discussed.

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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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