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STIL binding to Polo-box 3 of PLK4 regulates centriole duplication

Christian Arquint1, Anna-Maria Gabryjonczyk1, Stefan Imseng1

  • 1Biozentrum, University of Basel, Basel, Switzerland.

Elife
|July 19, 2015
PubMed

Insights

The STIL protein interacts with PLK4, a key regulator of cell division. This interaction is crucial for centriole duplication, a fundamental process in cell biology.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Polo-like kinases (PLK) regulate cell cycle, mitosis, and cytokinesis.
  • PLK4 is essential for centriole duplication, a critical process for cell division.

Purpose of the Study:

  • To investigate the interaction between STIL and PLK4.
  • To elucidate the structural basis of STIL-PLK4 interaction and its role in centriole duplication.

Main Methods:

  • In vivo interaction studies.
  • Nuclear Magnetic Resonance (NMR) and X-ray crystallography for structure determination.
  • Analysis of structure-guided STIL mutants.

Main Results:

  • STIL protein interacts with PLK4 via its coiled-coil region (STIL-CC).
  • STIL-CC binds to PLK4's Polo-box 3 (PB3) and L1 regions, revealing a novel interaction mode.
  • Distinct binding modes and interplay with STIL oligomerization were observed.

Conclusions:

  • The STIL-CC/PLK4 interaction is vital for PLK4 activation and stabilization.
  • This interaction plays a key role in regulating centriole duplication.
Keywords:
NMRX-ray crystallographybiophysicscell biologycell cyclecentriole duplicationhumanstructural biology

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