Journal
JOURNAL OF CELL BIOLOGY
Volume 217, Issue 2, Pages 483-493Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201707050
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Funding
- University of Geneva
- Swiss National Science Foundation [31003A_156013, 31003A_160006]
- Swiss National Science Foundation (SNF) [31003A_160006, 31003A_156013] Funding Source: Swiss National Science Foundation (SNF)
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Spindle orientation determines the axis of division and is crucial for cell fate, tissue morphogenesis, and the development of an organism. In animal cells, spindle orientation is regulated by the conserved G alpha i-LGN-NuMA complex, which targets the force generator dynein-dynactin to the cortex. In this study, we show that p37/UBXN2B, a cofactor of the p97 AAA ATPase, regulates spindle orientation in mammalian cells by limiting the levels of cortical NuMA. p37 controls cortical NuMA levels via the phosphatase PP1 and its regulatory subunit Repo-Man, but it acts independently of Gal, the kinase Aurora A, and the phosphatase PP2A. Our data show that in anaphase, when the spindle elongates, PP1/Repo-Man promotes the accumulation of NuMA at the cortex. In metaphase, p37 negatively regulates this function of PP1, resulting in lower cortical NuMA levels and correct spindle orientation.
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