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Science beyond Barriers

abberior dyes & labels

2018
Nucleic acids research

Oligomerization of Drosophila Nucleoplasmin-Like Protein is required for its centromere localization

Authors:

Anselm, E., Thomae, A. W., Jeyaprakash, A. A., & Heun, P.

Keywords:

Gene Regulation, Chromatin, Epigenetics

Abstract:

The evolutionarily conserved nucleoplasmin family of histone chaperones has two paralogues in Drosophila, named Nucleoplasmin-Like Protein (NLP) and Nucleophosmin (NPH). NLP localizes to the centromere, yet molecular underpinnings of this localization are unknown. Moreover, similar to homologues in other organisms, NLP forms a pentamer in vitro, but the biological significance of its oligomerization has not been explored. Here, we characterize the oligomers formed by NLP and NPH in vivo and find that oligomerization of NLP is required for its localization at the centromere. We can further show that oligomerization-deficient NLP is unable to bind the centromeric protein Hybrid Male Rescue (HMR), which in turn is required for targeting the NLP oligomer to the centromere. Finally, using super-resolution microscopy we find that NLP and HMR largely co-localize in domains that are immediately adjacent to, yet distinct from centromere domains defined by the centromeric histone dCENP-A.

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