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Caseins are highly phosphorylated milk proteins assembledin large colloidal structures termed micelles. In the milk ofruminants, as1-casein has been shown to be extensivelyphosphorylated. In this report we have determined thephosphorylation pattern of humanas1-casein by a combi-nationofmatrix-assisted laserdesorptionmass spectrometryand amino acid sequence analysis. Three phosphorylationvariants were identified. A nonphosphorylated form, avariant phosphorylated at Ser18 and a variant phosphory-lated at Ser18 and Ser26. Both phosphorylation sites arelocated in the amino acid recognition sequence of themammary gland casein kinase....
Nội dung trích xuất từ tài liệu:
Báo cáo khoa học: The phosphorylation pattern of human as1-casein is markedly different from the ruminant species
