Poly-dipeptides encoded by the C9orf72 repeats bind nucleoli, impede RNA biogenesis, and kill cells

Ilmin Kwon, Siheng Xiang, Masato Kato, Leeju Wu, Pano Theodoropoulos, Tao Wang, Jiwoong Kim, Jonghyun Yun, Yang Xie, Steven L. McKnight

Research output: Contribution to journalArticlepeer-review

327 Scopus citations

Abstract

Many RNA regulatory proteins controlling pre-messenger RNA splicing contain serine:arginine (SR) repeats. Here, we found that these SR domains bound hydrogel droplets composed of fibrous polymers of the low-complexity domain of heterogeneous ribonucleoprotein A2 (hnRNPA2). Hydrogel binding was reversed upon phosphorylation of the SR domain by CDC2-like kinases 1 and 2 (CLK1/2). Mutated variants of the SR domains changing serine to glycine (SR-to-GR variants) also bound to hnRNPA2 hydrogels but were not affected by CLK1/2. When expressed in mammalian cells, these variants bound nucleoli. The translation products of the sense and antisense transcripts of the expansion repeats associated with the C9orf72 gene altered in neurodegenerative disease encode GRn and PRn repeat polypeptides. Both peptides bound to hnRNPA2 hydrogels independent of CLK1/2 activity. When applied to cultured cells, both peptides entered cells, migrated to the nucleus, bound nucleoli, and poisoned RNA biogenesis, which caused cell death.

Original languageEnglish (US)
Pages (from-to)1139-1145
Number of pages7
JournalScience
Volume345
Issue number6201
DOIs
StatePublished - Sep 5 2014

ASJC Scopus subject areas

  • General

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