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Dynactin function in mitotic spindle positioning.

Jeffrey K Moore1, Jun Li, John A Cooper

  • 1Department of Cell Biology and Physiology, Washington University, Saint Louis, MO 63110, USA.

Traffic (Copenhagen, Denmark)
|January 29, 2008
PubMed
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Dynactin is crucial for dynein's role in yeast cell division, guiding mitotic spindle positioning. Its absence disrupts this process, highlighting dynactin's essential function in cellular organization.

Area of Science:

  • Cell Biology
  • Molecular and Structural Biology

Background:

  • Dynactin is a vital multisubunit complex essential for the function of the motor protein dynein.
  • Dynein and dynactin play critical roles in intracellular transport and cell division.

Purpose of the Study:

  • To investigate the specific functions and subunit requirements of dynactin in budding yeast.
  • To elucidate the mechanism by which dynactin interacts with dynein at microtubule plus ends and the cell cortex.

Main Methods:

  • Investigated dynactin function through gene deletion and analysis of mitotic spindle dynamics in budding yeast.
  • Utilized immunofluorescence microscopy to determine the localization of dynactin subunits and dynein.
  • Examined subunit interactions to propose a molecular model for yeast dynactin.

Related Experiment Videos

Main Results:

  • Loss of dynactin impaired mitotic spindle positioning and movement, similar to dynein loss.
  • Specific dynactin subunits (p150(Glued), dynamitin, Arp1, p24) were essential for function, while Arp10 and capping protein were dispensable.
  • Dynactin subunits localized to microtubule plus ends, cell cortex foci, and spindle pole bodies in small numbers.
  • Dynactin facilitates dynein offloading from microtubule plus ends to the cell cortex, with dynein required for dynactin targeting.

Conclusions:

  • Dynactin is indispensable for dynein-mediated mitotic spindle organization in budding yeast.
  • The p150(Glued) subunit is sufficient for dynactin's recruitment to microtubule plus ends.
  • Yeast dynactin shares structural similarities with brain dynactin but lacks certain subunits.