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The effect of N-terminal phosphorylation on the response of PEPCK activity to the concentration of PEP in the assay. PEPCK from illuminated and darkened leaves of Guinea grass is compared with the proteolytically cleaved form of PEPCK from leaves of Guinea grass, intact PEPCK from U. panicoides, and the enzyme from yeast. All assays contained 0.8 mm ATP and 0.2 mm ADP.
