Apyrases in adult frog tissues

Lipshitz, Rakoma; Frank, Sylvia

doi:10.1002/jcp.1030330104

J. Cell. Comp. Physiol.

1949

DOI: 10.1002/jcp.1030330104

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Apyrases in adult frog tissues

Rakoma Lipshitz

Sylvia Frank

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1950

1963

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Cited by 3 publications

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The role of adenosine‐tri‐phosphate in phosphate transfer from yolk to other proteins in the developing frog egg. I. General properties of the transfer system as a whole

Barth

Jaeger

1950

J. Cell. Comp. Physiol.

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Several proteins extractable from frog's eggs in early stages of development are able to split inorganic phosphate from adenosine-tri-phosphate (ATP) (Barth and Jaeger, '47). The egg also contains a phosphoproteiri phosphatase (PPPase) and an endogenous substrate for this enzyme, as demonstrated first by Harris ('46) and later by Peinsteiii arid Yolk ('49). Harris suggested that the PPPase liberates phosphate from the stored phosphoprotein of yolk to meet the metabolic needs of the developing embryo. Our interest in ATPases as based on the hypothesis that such enzymes might function in the transfer of energy to proteinr significant for differentiation.Extracts made in dilute KC1 o r 10% NaCl at plI 6.8 contain both the ATPase and the phosphoprotein phosphatase (PPPase). The pH at which these enzyme mixtures are incubated, however, has a profound effect on the aniourit of inorganic phosphate measurable at the end of a given interval. The PPPase has a pHactivity range of pH 3.0-6.8, with a iiiaximum at pH 5.0, whereas ATPase activity can be dernonstrntd in the alkaline range from pH 6.8-9.2 where the PPPase is inactive. That the ATPase may be active also in the acid range Aided by a grant froill The Committee on Growth acting for The Amerlcaii Cnriccr Society arid a grant from The Rockefeller Fomlclation. 413

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The role of adenosine‐tri‐phosphate in phosphate transfer from yolk to other proteins in the developing frog egg. I. General properties of the transfer system as a whole

Barth

Jaeger

1950

J. Cell. Comp. Physiol.

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Cytochemical demonstration of adenosinetriphosphatase in Stylonychia pustulata

Hunter

1963

J. Cell. Comp. Physiol.

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Studies on enzymes in the developing sea urchin egg

Gustafson

Hasselberg

1951

Experimental Cell Research

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Apyrases in adult frog tissues

Cited by 3 publications

References 10 publications

The role of adenosine‐tri‐phosphate in phosphate transfer from yolk to other proteins in the developing frog egg. I. General properties of the transfer system as a whole

The role of adenosine‐tri‐phosphate in phosphate transfer from yolk to other proteins in the developing frog egg. I. General properties of the transfer system as a whole

Cytochemical demonstration of adenosinetriphosphatase in Stylonychia pustulata

Studies on enzymes in the developing sea urchin egg

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