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BiP is a substrate for src kinase in vitro

A Carlino1, H Toledo, V Vidal

  • 1Roche Research Center, Roche Institute of Molecular Biology, Nutley, NJ 07110.

Biochemical and Biophysical Research Communications
|June 30, 1994
PubMed
Summary
This summary is machine-generated.

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Heat shock protein 70 (HSP70) family member BiP is phosphorylated by src kinase in vitro. This reaction offers an efficient method for BiP labeling, though in vivo evidence is currently lacking.

Area of Science:

  • Molecular Biology
  • Protein Biochemistry
  • Cellular Stress Response

Background:

  • Chaperones play crucial roles in protein folding and cellular homeostasis.
  • Src kinase is a non-receptor tyrosine kinase involved in various signaling pathways.
  • BiP (Binding immunoglobulin protein) is a key chaperone within the endoplasmic reticulum, belonging to the HSP70 family.

Purpose of the Study:

  • To investigate the potential of chaperones to modulate src kinase activity.
  • To determine if BiP serves as a substrate for src kinase.
  • To establish an efficient method for labeling BiP.

Main Methods:

  • In vitro kinase assay using purified src kinase and BiP.
  • Polylysine was used as a required cofactor in the reaction.

Related Experiment Videos

  • Analysis of phosphorylated residues using biochemical techniques.

    • Main Results:

    • BiP was identified as an excellent substrate for src kinase in vitro.
    • The phosphorylation reaction resulted in the modification of two tyrosine residues on BiP.
    • Polylysine was found to be essential for the observed src kinase activity on BiP.

    Conclusions:

    • Src kinase efficiently phosphorylates BiP at two tyrosine residues in vitro.
    • This phosphorylation reaction provides a novel and efficient method for BiP labeling.
    • Further investigation is needed to determine if this interaction occurs in vivo.