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A conserved peptide motif in Raver2 mediates its interaction with the polypyrimidine tract-binding protein.

Abstract：

:Raver2 was originally identified as a member of the hnRNP family through database searches revealing three N-terminal RNA recognition motifs (RRMs) bearing highest sequence identity in the RNP sequences to the related hnRNP Raver1. Outside the RRM region, both Raver proteins are quite divergent in sequence except for conserved peptide motifs of the [S/G][I/L]LGxxP consensus sequence. The latter have been implicated in Raver1 binding to the polypyrimidine tract-binding protein (PTB) a regulatory splicing repressor and common ligand of both Raver proteins. In the present study we investigated the association of Raver2 with RNA and PTB in more detail. The isolated RRM domain of Raver2 weakly interacted with ribonucleotides, but the full-length protein failed to directly bind to RNA in vitro. However, trimeric complexes with RNA were formed via binding to PTB. Raver2 harbors two putative PTB binding sequences in the C-terminal half of the protein, whose influence on Raver2-PTB complex formation was analyzed in a mutational approach, replacing critical leucine residues with alanines. While mutation of either sequence motif alone negatively affected Raver2 binding to PTB in vitro, only mutation of the more C-terminally located SLLGEPP motif significantly reduced the recruitment of Raver2 into perinucleolar compartments (PNCs) in HeLa cells. The latter observation was also confirmed for Raver1: out of four sequence motifs matching the PTB binding consensus, mutations in the SLLGEPP motif were the only ones attenuating the recruitment of Raver1 into PNCs. The conserved mode of PTB binding suggests that Raver2, like Raver1, may function as a modulator of PTB activity.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Henneberg B,Swiniarski S,Sabine Becke,Illenberger S

doi

10.1016/j.yexcr.2009.11.023

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

966-79

issue

6

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(09)00522-9

journal_volume

316

pub_type

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