A catalytic role for Mod5 in the formation of the Tea1 cell polarity landmark

Curr Biol. 2010 Oct 12;20(19):1752-7. doi: 10.1016/j.cub.2010.08.035. Epub 2010 Sep 16.


Many systems regulating cell polarity involve stable landmarks defined by internal cues. In the rod-shaped fission yeast Schizosaccharomyces pombe, microtubules regulate polarized vegetative growth via a landmark involving the protein Tea1. Tea1 is delivered to cell tips as packets of molecules associated with growing microtubule ends and anchored at the plasma membrane via a mechanism involving interaction with the membrane protein Mod5. Tea1 and Mod5 are highly concentrated in clusters at cell tips in a mutually dependent manner, but how the Tea1-Mod5 interaction contributes mechanistically to generating a stable landmark is not understood. Here, we use live-cell imaging, FRAP, and computational modeling to dissect dynamics of the Tea1-Mod5 interaction. Surprisingly, we find that Tea1 and Mod5 exhibit distinctly different turnover rates at cell tips. Our data and modeling suggest that rather than acting simply as a Tea1 receptor or as a molecular "glue" to retain Tea1, Mod5 functions catalytically to stimulate incorporation of Tea1 into a stable tip-associated cluster network. The model also suggests an emergent self-focusing property of the Tea1-Mod5 cluster network, which can increase the fidelity of polarized growth.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Polarity / physiology*
  • Computer Simulation
  • Fluorescence Recovery After Photobleaching
  • Microtubule-Associated Proteins / genetics
  • Microtubule-Associated Proteins / metabolism*
  • Microtubules / metabolism
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Schizosaccharomyces / cytology*
  • Schizosaccharomyces / physiology
  • Schizosaccharomyces pombe Proteins / genetics
  • Schizosaccharomyces pombe Proteins / metabolism*


  • Microtubule-Associated Proteins
  • Recombinant Fusion Proteins
  • Schizosaccharomyces pombe Proteins
  • Tea1 protein, S pombe
  • mod5 protein, S pombe