Eaf1 is the platform for NuA4 molecular assembly that evolutionarily links chromatin acetylation to ATP-dependent exchange of histone H2A variants.

Molecular and Cellular Biology
Andréanne AugerJacques Côté

Abstract

Eaf1 (for Esa1-associated factor 1) and Eaf2 have been identified as stable subunits of NuA4, a yeast histone H4/H2A acetyltransferase complex implicated in gene regulation and DNA repair. While both SWI3-ADA2-N-CoR-TF IIIB domain-containing proteins are required for normal cell cycle progression, their depletion does not affect the global Esa1-dependent acetylation of histones. In contrast to all other subunits, Eaf1 is found exclusively associated with the NuA4 complex in vivo. It serves as a platform that coordinates the assembly of functional groups of subunits into the native NuA4 complex. Eaf1 shows structural similarities with human p400/Domino, a subunit of the NuA4-related TIP60 complex. On the other hand, p400 also possesses an SWI2/SNF2 family ATPase domain that is absent from the yeast NuA4 complex. This domain is highly related to the yeast Swr1 protein, which is responsible for the incorporation of histone variant H2AZ in chromatin. Since all of the components of the TIP60 complex are homologous to SWR1 or NuA4 subunits, we proposed that the human complex corresponds to a physical merge of two yeast complexes. p400 function in TIP60 then would be accomplished in yeast by cooperation between SWR1 and NuA4. In agree...Continue Reading

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