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Related Experiment Videos

Structural differences between repressed and derepressed forms of p60c-src.

A MacAuley1, J A Cooper

  • 1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98104.

Molecular and Cellular Biology
|June 1, 1989
PubMed
Summary
This summary is machine-generated.

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Structural changes in p60c-src kinase activation were revealed using proteases. Proteolysis patterns differ between repressed and active forms, highlighting conformational shifts and functional roles of its regions.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Structure and Function

Background:

  • The kinase activity of p60c-src (a proto-oncogene tyrosine-protein kinase) is tightly regulated.
  • Activation involves derepression, often through modification or interaction at Tyr-527, the C-terminal inhibitory residue.
  • Understanding structural dynamics during activation is crucial for deciphering its biological roles.

Purpose of the Study:

  • To compare the protease digestion patterns of repressed and active p60c-src structures.
  • To identify conformational changes in p60c-src associated with kinase activation.
  • To elucidate the role of the amino-terminal region in p60c-src regulation and function.

Main Methods:

  • Comparative protease digestion studies using trypsin, pronase E, and thermolysin on different forms of p60c-src.

Related Experiment Videos

  • Analysis of proteolysis susceptibility at specific sites, particularly around the Tyr-527 residue and the kinase domain boundary.
  • Biochemical characterization of the released kinase domain fragment, including substrate specificity and phosphorylation patterns.

    • Main Results:

    • All p60c-src forms are cleaved at the amino-terminal/kinase domain boundary.
    • Repressed p60c-src exhibits unique trypsin cleavage sites compared to the active form.
    • The C-terminal tail is more susceptible to pronase E and thermolysin digestion when Tyr-527 is unphosphorylated.
    • The isolated kinase domain fragment retains activity but shows altered substrate specificity and regulation.

    Conclusions:

    • Protease sensitivity reveals distinct structural conformations between repressed and active p60c-src.
    • The carboxy-terminal tail's conformation is influenced by Tyr-527 phosphorylation status.
    • The amino-terminal region plays a significant role in regulating kinase activity and undergoes conformational changes upon activation.