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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Metabolism of glycerate-2,3-P2--II. Enzymes involved in the glycerate-2,3-P2 metabolism in chicken skeletal muscle.

1. Four enzyme fractions which may be involved in the synthesis and breakdown of glycerate-2,3-P2 have been isolated from extracted skeletal muscle by gel-filtration and ion-exchange chromatography. 2. One of the fractions, corresponding to the glycerate-2,3-P2 dependent phosphoglycerate mutase, has been purified to homogeneity. In addition to the main enzymatic activity, it shows intrinsic glycerate-2,3-P2 synthase activity and glycerate-2,3-P2 phosphatase activity stimulable by glycolate-2-P. Its synthase activity represents about 10% of the total synthase activity of the tissue, and its phosphatase activity corresponds to about 60% of the total phosphatase activity. 3. Two of the fractions have glycerate-2,3-P2 synthase, glycerate-2,3-P2 phosphatase and phosphoglycerate mutase activities in a ratio similar to that of the glycerate-2,3-P2 synthase described in mammalian skeletal muscle. Their synthase activity corresponds to about 90% of the total synthase activity, and their phosphatase activity represents about 1% of the total phosphatase activity of the tissue. 4. The fourth fraction shows only glycerate-2,3-P2 phosphatase activity and represents about 40% of the total activity of the tissue. 5. It is suggested that in chicken skeletal muscle the metabolism of the glycerate-2,3-P2 is regulated in a way similar to that described in mammalian skeletal muscle.[1]


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