SRm160 splicing coactivator promotes transcript 3'-end cleavage.

Abstract:

:Individual steps in the processing of pre-mRNA, including 5'-end cap formation, splicing, and 3'-end processing (cleavage and polyadenylation) are highly integrated and can influence one another. In addition, prior splicing can influence downstream steps in gene expression, including export of mRNA from the nucleus. However, the factors and mechanisms coordinating these steps in the maturation of pre-mRNA transcripts are not well understood. In the present study we demonstrate that SRm160 (for serine/arginine repeat-related nuclear matrix protein of 160 kDa), a coactivator of constitutive and exon enhancer-dependent splicing, participates in 3'-end formation. Increased levels of SRm160 promoted the 3'-end cleavage of transcripts both in vivo and in vitro. Remarkably, at high levels in vivo SRm160 activated the 3'-end cleavage and cytoplasmic accumulation of unspliced pre-mRNAs, thereby uncoupling the requirement for splicing to promote the 3'-end formation and nuclear release of these transcripts. Consistent with a role in 3'-end formation coupled to splicing, SRm160 was found to associate specifically with the cleavage polyadenylation specificity factor and to stimulate the 3'-end cleavage of splicing-active pre-mRNAs more efficiently than that of splicing-inactive pre-mRNAs in vitro. The results provide evidence for a role for SRm160 in mRNA 3'-end formation and suggest that the level of this splicing coactivator is important for the proper coordination of pre-mRNA processing events.

journal_name

Mol Cell Biol

authors

McCracken S,Lambermon M,Blencowe BJ

doi

10.1128/mcb.22.1.148-160.2002

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

148-60

issue

1

eissn

0270-7306

issn

1098-5549

journal_volume

22

pub_type

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