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 Devjournal_title
Genes & developmentauthors
Szymczyna BR,Bowman J,McCracken S,Pineda-Lucena A,Lu Y,Cox B,Lambermon M,Graveley BR,Arrowsmith CH,Blencowe BJdoi
10.1101/gad.1060403subject
Has Abstractpub_date
2003-02-15 00:00:00pages
461-75issue
4eissn
0890-9369issn
1549-5477journal_volume
17pub_type
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