Bub1 is a Fission Yeast Kinetochore Scaffold Protein, and is Sufficient to Recruit Other Spindle Checkpoint Proteins to Ectopic Sites on Chromosomes

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2007 Dec 21

PMID 18094750

Citations 26

Authors

Patricia E Rischitor

Karen M May

Kevin G Hardwick

Affiliations

Soon will be listed here.

Abstract

The spindle checkpoint delays anaphase onset until all chromosomes have attached in a bi-polar manner to the mitotic spindle. Mad and Bub proteins are recruited to unattached kinetochores, and generate diffusible anaphase inhibitors. Checkpoint models propose that Mad1 and Bub1 act as stable kinetochore-bound scaffolds, to enhance recruitment of Mad2 and Mad3/BubR1, but this remains untested for Bub1. Here, fission yeast FRAP experiments confirm that Bub1 stably binds kinetochores, and by tethering Bub1 to telomeres we demonstrate that it is sufficient to recruit anaphase inhibitors in a kinase-independent manner. We propose that the major checkpoint role for Bub1 is as a signalling scaffold.

Citing Articles

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