PlumX Metrics
Embed PlumX Metrics

Mitotic Inhibition of GRASP65 Organelle Tethering Involves Polo-like Kinase 1 (PLK1) Phosphorylation Proximate to an Internal PDZ Ligand *

Journal of Biological Chemistry, ISSN: 0021-9258, Vol: 285, Issue: 51, Page: 39994-40003
2010
  • 42
    Citations
  • 0
    Usage
  • 33
    Captures
  • 0
    Mentions
  • 29
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    42
  • Captures
    33
  • Social Media
    29
    • Shares, Likes & Comments
      29
      • Facebook
        29

Article Description

GRASP65 links cis-Golgi cisternae via a homotypic, N-terminal PDZ interaction, and its mitotic phosphorylation disrupts this activity. Neither the identity of the PDZ ligand involved in the GRASP65 self-interaction nor the mechanism by which phosphorylation inhibits its interaction is known. Phospho-mimetic mutation of known cyclin-dependent kinase 1/cyclin B sites, all of which are in the C-terminal “regulatory domain” of the molecule, failed to block organelle tethering. However, we identified a site phosphorylated by Polo-like kinase 1 (PLK1) in the GRASP65 N-terminal domain for which mutation to aspartic acid blocked tethering and alanine substitution prevented mitotic Golgi unlinking. Further, using interaction assays, we discovered an internal PDZ ligand adjacent to the PLK phosphorylation site that was required for tethering. These results reveal the mechanism of phosphoinhibition as direct inhibition by PLK1 of the PDZ ligand underlying the GRASP65 self-interaction.

Provide Feedback

Have ideas for a new metric? Would you like to see something else here?Let us know