Remodeling of nucleosome-dimer particles with yIsw2 promotes their association with ALL-1 SET domain in vitro

Biochemistry
Wladyslaw A Krajewski, Oleg L Vassiliev

Abstract

Functioning of histone lysine methyltransferases (HKMTs) involves interactions of their catalytic domain "SET" with the N-termini of histone H3. However, these interactions are restricted in canonical nucleosomes due to the limited accessibility of H3 termini. Here we investigated whether nucleosome remodeling with the yeast Isw2 affects nucleosome affinity to the SET domain of ALL-1 HKMT. Reconstitution of mononucleosomes by salt dilutions also produces some nucleosome-dimer particles (self-associated mononucleosomes, described by: Tatchell and van Holde (1977) Biochemistry, 16, 5295-5303). The GST-tagged SET-domain polypeptide of ALL-1 was assayed for binding to assembled mononucleosomes and nucleosome-dimer particles, either intact or remodeled with purified yeast Isw2. Remodeling of mononucleosomes does not noticeably affect their affinity to SET domain; however, yIsw2 remodeling of nucleosome-dimer particles facilitated their association with GST-SET polypeptide. Therefore, it is conceivable that nucleosome interactions in trans could be implicated in the maintenance of chromatin methylation patterns in vivo.

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