Protein phosphatase 1 binds to the RNA recognition motif of several splicing factors and regulates alternative pre-mRNA processing.

Abstract:

:Alternative splicing emerges as one of the most important mechanisms to generate transcript diversity. It is regulated by the formation of protein complexes on pre-mRNA. We demonstrate that protein phosphatase 1 (PP1) binds to the splicing factor transformer2-beta1 (tra2-beta1) via a phylogenetically conserved RVDF sequence located on the RNA recognition motif (RRM) of tra2-beta1. PP1 binds directly to tra2-beta1 and dephosphorylates it, which regulates the interaction between tra2-beta1 and other proteins. Eight other proteins, including SF2/ASF and SRp30c, contain an evolutionary conserved PP1 docking motif in the beta-4 strand of their RRMs indicating that binding to PP1 is a new function of some RRMs. Reducing PP1 activity promotes usage of numerous alternative exons, demonstrating a role of PP1 activity in splice site selection. PP1 inhibition promotes inclusion of the survival of motoneuron 2 exon 7 in a mouse model expressing the human gene. This suggests that reducing PP1 activity could be a new therapeutic principle to treat spinal muscular atrophy and other diseases caused by missplicing events. Our data indicate that the binding of PP1 to evolutionary conserved motifs in several RRMs is the link between known signal transduction pathways regulating PP1 activity and pre-mRNA processing.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Novoyatleva T,Heinrich B,Tang Y,Benderska N,Butchbach ME,Lorson CL,Lorson MA,Ben-Dov C,Fehlbaum P,Bracco L,Burghes AH,Bollen M,Stamm S

doi

10.1093/hmg/ddm284

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

52-70

issue

1

eissn

0964-6906

issn

1460-2083

pii

ddm284

journal_volume

17

pub_type

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