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Area of Science:

  • Cell Biology
  • Structural Biology
  • Molecular Motors

Background:

  • Cortical force generators link cell polarity to astral microtubules for mitotic spindle orientation.
  • LGN and NuMA protein complexes, recruited by Gαi-subunits, are crucial for this process, interacting with dynein/dynactin to pull on microtubules.

Purpose of the Study:

  • To determine the unknown architecture of cortical force generators.
  • To elucidate the structural basis of essential spindle orientation motors.

Main Methods:

  • Crystal structure determination of NuMA:LGN hetero-hexamers.

Main Results:

  • The crystal structure of NuMA:LGN hetero-hexamers was determined.
  • This structure reveals how these complexes promote the assembly of active cortical dynein/dynactin motors.

Conclusions:

  • The study elucidates the structural organization of essential spindle orientation motors.
  • Understanding this architecture is key to comprehending oriented cell divisions in polarized cells.