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- W1983205806 abstract "Sucrose-phosphate synthase (SPS; EC 2.4.1.14) is regulated in part by reversible protein phosphorylation. When dephospho-SPS is partially purified from illuminated spinach leaves and incubated with [γ-32P]ATP the enzyme is phosphorylated by a copurifying protein kinase. In this report, 32P-phosphopeptides from tryptic digests of in vitro phosphorylated SPS were purified by metal-ion affinity chromatography and reversed-phase high-performance liquid chromatography. Three distinct 32P-phosphopeptides were resolved. Edman sequencing of the major phosphopeptide (which contained >80% of the total 32P) identified the amino acid sequence as Ile-Ser-Ser(P)-Val-Glu-Met-Met-Asp-Asn-Trp-Ala-Asn-Thr-Phe-Lys.This sequence corresponds to residues 156 to 170 of the deduced amino acid sequence of spinach SPS [Klein, R. R., Crafts-Brandner, S. J., and Salvucci, M. E. (1993) Planta 190, 498-510, and Sonnewald, U., Quick, W. P., MacRae, E., Krause, K.-P., and Stitt, M. (1993) Planta 189, 174-181]. Identification of the phosphoseryl residue was accomplished by manual Edman sequencing. The two other phosphopeptides, which each contained less than 10% of the total 32P, were not sequenced. An Escherichia coli expressed, 26-kDa fragment of SPS which contains the major phosphorylation site was a substrate for the protein kinase which copurifies with SPS. Two-dimensional peptide mapping analysis of this fragment showed the major phosphopeptide was present but not the other site(s), suggesting that other peptides are derived from a site other than Ser158. These results provide additional indirect evidence for the presence of multiple phosphorylation sites in SPS." @default.
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- W1983205806 date "1993-12-01" @default.
- W1983205806 modified "2023-10-16" @default.
- W1983205806 title "Identification of the Major Regulatory Phosphorylation Site in Sucrose-Phosphate Synthase" @default.
- W1983205806 doi "https://doi.org/10.1006/abbi.1993.1586" @default.
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