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Human beta-casein.

R Greenberg, M L Groves

The Journal of Dairy Research

|April 1, 1979

Summary

This summary is machine-generated.

Human beta-casein exhibits multiple phosphorylation patterns. While higher phosphate forms are specific, the monophosphorylated form contains a mix of two distinct phosphorylation sites.

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Area of Science:

Biochemistry
Molecular Biology
Protein Chemistry

Background:

Human beta-casein exists in various phosphorylated forms.
These forms share the same amino acid composition but differ in phosphate group content (0-5 per molecule).

Purpose of the Study:

To investigate the distribution of phosphate groups in human beta-casein.
To determine if phosphorylation sites are specific or randomly distributed across different forms.

Main Methods:

Utilized sequence analysis to identify phosphorylation sites.
Analyzed beta-casein forms with varying phosphate group numbers (0-5).

Main Results:

Forms with 2, 4, and 5 phosphate groups are homogeneous, indicating specific phosphorylation sites.

The monophosphorylated form is a mixture of two species, phosphorylated at either residue 9 or 10.

Conclusions:

Phosphorylation sites on human beta-casein are specific for higher phosphate forms.
Monophosphorylated human beta-casein displays heterogeneity in phosphorylation sites.