Structure and function of the PWI motif: a novel nucleic acid-binding domain that facilitates pre-mRNA processing.

Abstract:

:The PWI motif is a highly conserved domain of unknown function in the SRm160 splicing and 3'-end cleavage-stimulatory factor, as well as in several other known or putative pre-mRNA processing components. We show here that the PWI motif is a new type of RNA/DNA-binding domain that has an equal preference for single- and double-stranded nucleic acids. Deletion of the motif prevents SRm160 from binding RNA and stimulating 3'-end cleavage, and its substitution with a heterologous RNA-binding domain restores these functions. The NMR solution structure of the SRm160-PWI motif reveals a novel, four-helix bundle and represents the first example of an alpha-helical fold that can bind single-stranded (ss)RNA. Structure-guided mutagenesis indicates that the same surface is involved in RNA and DNA binding and requires the cooperative action of a highly conserved, adjacent basic region. Thus, the PWI motif is a novel type of nucleic acid-binding domain that likely has multiple important functions in pre-mRNA processing, including SRm160-dependent stimulation of 3'-end formation.

journal_name

Genes Dev

journal_title

Genes & development

authors

Szymczyna BR,Bowman J,McCracken S,Pineda-Lucena A,Lu Y,Cox B,Lambermon M,Graveley BR,Arrowsmith CH,Blencowe BJ

doi

10.1101/gad.1060403

subject

Has Abstract

pub_date

2003-02-15 00:00:00

pages

461-75

issue

4

eissn

0890-9369

issn

1549-5477

journal_volume

17

pub_type

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