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Posttranslational modification in rat bone osteopontin

P J Neame1, W T Butler

  • 1Shriners Hospital, Department of Biochemistry and Molecular Biology, University of South Florida, Tampa 33612, USA. pneame@com1.med.usf.edu

Connective Tissue Research
|January 1, 1996
PubMed
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Rat bone osteopontin exhibits variable phosphorylation and lysine modifications, leading to significant heterogeneity. This contrasts with bovine milk osteopontin, highlighting species-specific post-translational modifications.

Area of Science:

  • Biochemistry
  • Proteomics
  • Molecular Biology

Background:

  • Osteopontin is a glycoprotein found in bone, milk, and urine, known for cell adhesion properties.
  • It contains an RGD sequence and high aspartic acid content, with variable phosphorylation.
  • Osteopontin is also present in malignant tissues, suggesting diverse biological roles.

Purpose of the Study:

  • To analyze post-translational modifications in rat bone osteopontin.
  • To investigate the heterogeneity of osteopontin modifications.
  • To compare modifications between rat bone and bovine milk osteopontin.

Main Methods:

  • Peptide generation from rat bone osteopontin using endoprotease Lys-C.
  • Analysis of post-translational modifications via Edman degradation.

Related Experiment Videos

  • Matrix-assisted laser desorption mass spectrometry (MALDI-MS) for peptide analysis.

    • Main Results:

    • Eleven variably phosphorylated sites were identified in rat bone osteopontin peptides.
    • Three modified lysines (Lys19, Lys29, Lys286) were detected through distinct analytical observations.
    • Significant heterogeneity was observed, with no single modification present in 100% of analyzed peptides.
    • Conserved serine residues showed partial phosphorylation in rat bone osteopontin, mirroring some patterns in bovine milk osteopontin.

    Conclusions:

    • Rat bone osteopontin displays extensive and variable post-translational modifications, contributing to its heterogeneity.
    • These findings highlight species- and tissue-specific differences in osteopontin modification.
    • Understanding these modifications is crucial for elucidating osteopontin's diverse functions.