Nucleosomal DNA regulates the core-histone-binding subunit of the human Hat1 acetyltransferase

Current Biology : CB
A VerreaultB Stillman

Abstract

In eukaryotic cells, newly synthesized histone H4 is acetylated at lysines 5 and 12, a transient modification erased by deacetylases shortly after deposition of histones into chromosomes. Genetic studies in Saccharomyces cerevisiae revealed that acetylation of newly synthesized histones H3 and H4 is likely to be important for maintaining cell viability; the precise biochemical function of this acetylation is not known, however. The identification of enzymes mediating site-specific acetylation of H4 at Lys5 and Lys12 may help explain the function of the acetylation of newly synthesized histones. A cDNA encoding the catalytic subunit of the human Hat1 acetyltransferase was cloned and, using specific antibodies, the Hat1 holoenzyme was purified from human 293 cells. The human enzyme acetylates soluble but not nucleosomal H4 at Lys5 and Lys12 and acetylates histone H2A at Lys5. Unexpectedly, we found Hat1 in the nucleus of S-phase cells. Like its yeast counterpart, the human holoenzyme consists of two subunits: a catalytic subunit, Hat1, and a subunit that binds core histones, p46, which greatly stimulates the acetyltransferase activity of Hat1. Both p46 and the highly related p48 polypeptide (the small subunit of human chromatin a...Continue Reading

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