Abstract
The checkpoint protein Mad2 inhibits the activity of the anaphase promoting complex by sequestering Cdc20 until all chromosomes are aligned at the metaphase plate. We report the solution structure of human Mad2 and its interaction with Cdc20. Mad2 possesses a novel three-layered α/β fold with three α-helices packed between two β-sheets. Using deletion mutants we identified the minimal Mad2-binding region of human Cdc20 as a 40-residue segment immediately N-terminal to the WD40 repeats. Mutagenesis and NMR titration experiments show that a C-terminal flexible region of Mad2 is required for binding to Cdc20. Mad2 and Cdc20 form a tight 1:1 heterodimeric complex in which the C-terminal segment of Mad2 becomes folded. These results provide the first structural insight into mechanisms of the spindle assembly checkpoint.
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Acknowledgements
We thank J. Rizo for assistance with NMR data acquisition and critical reading of the manuscript. X.L. is the recipient of a postdoctoral fellowship from the National Cancer Institute. G.F. is supported by the Burroughs Wellcome Fund Career Award in the Biomedical Sciences. H.Y. is the Michael Rosenberg Scholar in Biomedical Research and a Damon Runyon Scholar. This work is supported in part by the Damon Runyon Foundation and the Robert A. Welch Foundation (to H.Y.) and the National Institutes of Health (to G.W. and M.W.K.)
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Luo, X., Fang, G., Coldiron, M. et al. Structure of the Mad2 spindle assembly checkpoint protein and its interaction with Cdc20. Nat Struct Mol Biol 7, 224–229 (2000). https://doi.org/10.1038/73338
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DOI: https://doi.org/10.1038/73338
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