Letter | Published:

Recognition of unmethylated histone H3 lysine 4 links BHC80 to LSD1-mediated gene repression

Nature volume 448, pages 718722 (09 August 2007) | Download Citation

Abstract

Histone methylation is crucial for regulating chromatin structure, gene transcription and the epigenetic state of the cell. LSD1 is a lysine-specific histone demethylase that represses transcription by demethylating histone H3 on lysine 4 (ref. 1). The LSD1 complex contains a number of proteins, all of which have been assigned roles in events upstream of LSD1-mediated demethylation2,3,4 apart from BHC80 (also known as PHF21A), a plant homeodomain (PHD) finger-containing protein. Here we report that, in contrast to the PHD fingers of the bromodomain PHD finger transcription factor (BPTF) and inhibitor of growth family 2 (ING2), which bind methylated H3K4 (H3K4me3)5,6, the PHD finger of BHC80 binds unmethylated H3K4 (H3K4me0), and this interaction is specifically abrogated by methylation of H3K4. The crystal structure of the PHD finger of BHC80 bound to an unmodified H3 peptide has revealed the structural basis of the recognition of H3K4me0. Knockdown of BHC80 by RNA inhibition results in the de-repression of LSD1 target genes, and this repression is restored by the reintroduction of wild-type BHC80 but not by a PHD-finger mutant that cannot bind H3. Chromatin immunoprecipitation showed that BHC80 and LSD1 depend reciprocally on one another to associate with chromatin. These findings couple the function of BHC80 to that of LSD1, and indicate that unmodified H3K4 is part of the ‘histone code’7. They further raise the possibility that the generation and recognition of the unmodified state on histone tails in general might be just as crucial as post-translational modifications of histone for chromatin and transcriptional regulation.

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Acknowledgements

We thank S. Iwase and T. Baba for the gift of BHC80 antibody and Yujiang Shi for discussion. This work was supported by grants from the NIH to X.C. and Y.S..

The X-ray structure of the BHC80 PHD domain in complex with the H3 tail peptide has been deposited to PDB as 2PUY.

Author information

Author notes

    • Fei Lan
    •  & Robert E. Collins

    These authors contributed equally to this work.

    • Rossella De Cegli

    Present address: Telethon Institute of Genetics and Medicine (TIGEM), Via P. Castellino 111, 80131 Naples, Italy.

Affiliations

  1. Department of Pathology, Harvard Medical School, 77 Ave Louis Pasteur, Boston, Massachusetts 02115, USA

    • Fei Lan
    • , Rossella De Cegli
    • , Roman Alpatov
    •  & Yang Shi
  2. Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, Georgia 30322, USA

    • Robert E. Collins
    • , John R. Horton
    •  & Xiaodong Cheng
  3. Department of Biological Sciences, Stanford University, Stanford, California 94305, USA

    • Xiaobing Shi
    •  & Or Gozani
  4. Dipartimento di Biochimica e Biotecnologie Mediche, Università di Napoli ‘Federico II’, Via S. Pansini 5, 80131 Napoli, Italy

    • Rossella De Cegli

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Competing interests

Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

Corresponding authors

Correspondence to Xiaodong Cheng or Yang Shi.

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    Supplementary Information

    This file contains Supplementary Figures S1-S5 with Legends and Supplementary Table S1.

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https://doi.org/10.1038/nature06034

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