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Raf-1 is activated during mitosis

A D Laird1, S J Taylor, M Oberst

  • 1Section of Biochemistry, Molecular and Cell Biology, Cornell University, Ithaca, New York 14853, USA.

The Journal of Biological Chemistry
|November 10, 1995
PubMed
Summary
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Raf-1 kinase activity is stimulated during mitosis, not just in growth factor signaling. This suggests a broader role for Raf-1 in cell cycle progression beyond early phases.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Raf-1 serine/threonine kinase is a key signaling molecule in the mitogen-activated protein kinase (MAPK) cascade.
  • Its role in transmitting proliferative and developmental signals, particularly in growth factor-mediated cell cycle activation, is well-established.

Purpose of the Study:

  • To investigate the activity and regulation of Raf-1 kinase during mitosis.
  • To determine if Raf-1 plays a role in cell cycle phases beyond growth factor signaling.

Main Methods:

  • Analysis of Raf-1 kinase activity during different phases of the cell cycle.
  • Assessment of Raf-1 phosphorylation status using electrophoretic mobility shift assays.

Main Results:

Related Experiment Videos

  • Raf-1 kinase activity is significantly elevated during mitosis.
  • Mitotic hyperphosphorylation of Raf-1 results in a distinct electrophoretic mobility shift.
  • These findings indicate a novel role for Raf-1 during cell division.

Conclusions:

  • Raf-1 kinase is not only involved in growth factor-induced cell cycle progression but also plays a crucial role during mitosis.
  • The heightened activity and altered phosphorylation of Raf-1 during mitosis suggest its involvement in regulating mitotic progression.