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Related Experiment Videos

Post-translational phosphorylation of proteodermatan sulfate.

J Glössl, W Hoppe, H Kresse

    The Journal of Biological Chemistry
    |February 5, 1986
    PubMed
    Summary

    Small proteodermatan sulfate core proteins are phosphorylated early in synthesis, even with transport or oligosaccharide attachment blocked. This phosphorylation occurs on serine residues before glycosaminoglycan chain addition.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Glycobiology

    Background:

    • Proteoglycans are key extracellular matrix components involved in cell signaling and structural support.
    • Post-translational modifications, such as phosphorylation, are critical for protein function and localization.
    • The synthesis and modification of proteodermatan sulfate involve complex intracellular pathways.

    Purpose of the Study:

    • To investigate the timing and sites of core protein phosphorylation in small proteodermatan sulfate.
    • To determine if phosphorylation occurs before or after glycosaminoglycan chain synthesis.
    • To identify the specific amino acid residues and regions targeted for phosphorylation.

    Main Methods:

    • Cultured human skin fibroblasts were used as the experimental model.
    • Intracellular transport was inhibited using carbonyl cyanide m-chlorophenylhydrazone.
    • Asparagine-linked oligosaccharide attachment was prevented using tunicamycin.
    • Phosphorylation sites were analyzed using alkaline borohydride treatment and chondroitin ABC lyase degradation.

    Main Results:

    • Core protein phosphorylation of small proteodermatan sulfate occurs post-translationally but prior to glycosaminoglycan chain synthesis.
    • Phosphorylation can proceed even when intracellular transport or N-linked glycosylation is inhibited.
    • Serine residues and glycosaminoglycan chains were identified as phosphorylation sites.
    • Degradation products indicate phosphorylation on the glycosaminoglycan chains.

    Conclusions:

    • Core protein phosphorylation is an early event in small proteodermatan sulfate biosynthesis.
    • This phosphorylation is independent of N-linked glycosylation and occurs before GAG chain attachment.
    • Understanding these modifications is crucial for comprehending proteoglycan assembly and function.

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