Abstract:
:Nucleoplasmin (Npm) is an abundant histone chaperone in vertebrate oocytes and embryos. During embryogenesis, regulation of Npm histone binding is critical for its function in storing and releasing maternal histones to establish and maintain the zygotic epigenome. Here, we demonstrate that Xenopus laevis Npm post-translational modifications (PTMs) specific to the oocyte and egg promote either histone deposition or sequestration, respectively. Mass spectrometry and Npm phosphomimetic mutations used in chromatin assembly assays identified hyperphosphorylation on the N-terminal tail as a critical regulator for sequestration. C-terminal tail phosphorylation and PRMT5-catalyzed arginine methylation enhance nucleosome assembly by promoting histone interaction with the second acidic tract of Npm. Electron microscopy reconstructions of Npm and TTLL4 activity toward the C-terminal tail demonstrate that oocyte- and egg-specific PTMs cause Npm conformational changes. Our results reveal that PTMs regulate Npm chaperoning activity by modulating Npm conformation and Npm-histone interaction, leading to histone sequestration in the egg.
journal_name
Cell Repjournal_title
Cell reportsauthors
Onikubo T,Nicklay JJ,Xing L,Warren C,Anson B,Wang WL,Burgos ES,Ruff SE,Shabanowitz J,Cheng RH,Hunt DF,Shechter Ddoi
10.1016/j.celrep.2015.02.038subject
Has Abstractpub_date
2015-03-17 00:00:00pages
1735-1748issue
10issn
2211-1247pii
S2211-1247(15)00196-5journal_volume
10pub_type
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