Letter | Published:

Regulation of cell cycle progression and gene expression by H2A deubiquitination

Nature volume 449, pages 10681072 (25 October 2007) | Download Citation

Abstract

Post-translational histone modifications have important regulatory roles in chromatin structure and function1,2,3. One example of such modifications is histone ubiquitination, which occurs predominately on histone H2A and H2B. Although the recent identification of the ubiquitin ligase for histone H2A has revealed important roles for H2A ubiquitination in Hox gene silencing4,5,6 as well as in X-chromosome inactivation7,8, the enzyme(s) involved in H2A deubiquitination and the function of H2A deubiquitination are not known. Here we report the identification and functional characterization of the major deubiquitinase for histone H2A, Ubp-M (also called USP16). Ubp-M prefers nucleosomal substrates in vitro, and specifically deubiquitinates histone H2A but not H2B in vitro and in vivo. Notably, knockdown of Ubp-M in HeLa cells results in slow cell growth rates owing to defects in the mitotic phase of the cell cycle. Further studies reveal that H2A deubiquitination by Ubp-M is a prerequisite for subsequent phosphorylation of Ser 10 of H3 and chromosome segregation when cells enter mitosis. Furthermore, we demonstrate that Ubp-M regulates Hox gene expression through H2A deubiquitination and that blocking the function of Ubp-M results in defective posterior development in Xenopus laevis. This study identifies the major deubiquitinase for histone H2A and demonstrates that H2A deubiquitination is critically involved in cell cycle progression and gene expression.

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Acknowledgements

We thank S. L. Berger and M. A. Osley for yeast strains; J. J. Hayes for XP-10 plasmid; and J. Wei for the initial cloning of Ubp-M. We also thank D. Crawford and W. S. Brooks for suggestions on cell cycle and apoptosis analysis; T. Townes and W. S. Brooks for critical reading of the manuscript; E. F. Keyser for assistance with FACS analysis; and A. Nazarian for help with mass spectrometric analysis. This work was supported by a start-up grant (to H.W.) and NCI Cancer Center Support Grant (to P.T.).

Author Contributions H.W. designed the experimental strategy, performed parts of the purification and wrote the paper; H.-Y.J. performed most of the purification, determined the substrate preference and investigated the role of Ubp-M in cell cycle progression and gene expression; L.Z. determined the substrate specificity of Ubp-M and performed the in vitro kinase reaction and nucleosome pull-down experiments; C.Y. cloned the Xenopus Hoxd10 gene and generated the RNAi-resistant Ubp-M constructs; S.N. and C.C. performed the Xenopus injection and in situ hybridization; H.E.-B. and P.T. performed mass spectrometric analysis.

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Author notes

    • Heui-Yun Joo
    •  & Ling Zhai

    These authors contributed equally to this work.

Affiliations

  1. Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Kaul Human Genetics Building 402A, 720 South 20th Street, Birmingham, Alabama 35294, USA

    • Heui-Yun Joo
    • , Ling Zhai
    • , Chunying Yang
    •  & Hengbin Wang
  2. Department of Cell Biology, University of Alabama at Birmingham, MCLM 360, Birmingham, Alabama 35294-0005, USA

    • Shuyi Nie
    •  & Chenbei Chang
  3. Molecular Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10021, USA

    • Hediye Erdjument-Bromage
    •  & Paul Tempst

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Corresponding author

Correspondence to Hengbin Wang.

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https://doi.org/10.1038/nature06256

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