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Genes Dev. 2005 Jun 15;19(12):1455-65. Epub 2005 Jun 2.

Structural and functional analysis of SET8, a histone H4 Lys-20 methyltransferase.

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  • 1Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

Abstract

SET8 (also known as PR-SET7) is a histone H4-Lys-20-specific methyltransferase that is implicated in cell-cycle-dependent transcriptional silencing and mitotic regulation in metazoans. Herein we report the crystal structure of human SET8 (hSET8) bound to a histone H4 peptide bearing Lys-20 and the product cofactor S-adenosylhomocysteine. Histone H4 intercalates in the substrate-binding cleft as an extended parallel beta-strand. Residues preceding Lys-20 in H4 engage in an extensive array of salt bridge, hydrogen bond, and van der Waals interactions with hSET8, while the C-terminal residues bind through predominantly hydrophobic interactions. Mutational analysis of both the substrate-binding cleft and histone H4 reveals that interactions with residues in the N and C termini of the H4 peptide are critical for conferring substrate specificity. Finally, analysis of the product specificity indicates that hSET8 is a monomethylase, consistent with its role in the maintenance of Lys-20 monomethylation during cell division.

PMID:
15933070
[PubMed - indexed for MEDLINE]
PMCID:
PMC1151662
Free PMC Article
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