About the Authors

Thea A. Egelhofer

Affiliation Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, California, United States of America

Judit Villén

Affiliation Department of Cell Biology, Taplin Biological Mass Spectrometry Facility, Harvard Medical School, Boston, Massachusetts, United States of America

Derek McCusker

Affiliation Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, California, United States of America

Steven P. Gygi

Affiliation Department of Cell Biology, Taplin Biological Mass Spectrometry Facility, Harvard Medical School, Boston, Massachusetts, United States of America

Douglas R. Kellogg

To whom correspondence should be addressed. E-mail: kellogg@biology.ucsc.edu

Affiliation Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SG DK TE. Performed the experiments: TE. Analyzed the data: DK TE JV. Contributed reagents/materials/analysis tools: JV DM. Wrote the paper: DK TE. Other: Purified CDK1-CLN2: DM. Performed phosphorylation site mapping: SG JV.