Proteopedia

1mp1

Solution structure of the PWI motif from SRm160Solution structure of the PWI motif from SRm160

Structural highlights

1mp1 is a 1 chain structure with sequence from Homo sapiens. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SRRM1_HUMAN Part of pre- and post-splicing multiprotein mRNP complexes. Involved in numerous pre-mRNA processing events. Promotes constitutive and exonic splicing enhancer (ESE)-dependent splicing activation by bridging together sequence-specific (SR family proteins, SFRS4, SFRS5 and TRA2B/SFRS10) and basal snRNP (SNRP70 and SNRPA1) factors of the spliceosome. Stimulates mRNA 3'-end cleavage independently of the formation of an exon junction complex. Binds both pre-mRNA and spliced mRNA 20-25 nt upstream of exon-exon junctions. Binds RNA and DNA with low sequence specificity and has similar preference for either double- or single-stranded nucleic acid substrates.[1] [2] [3] [4] [5] [6]

Evolutionary Conservation

 

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

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.

Structure and function of the PWI motif: a novel nucleic acid-binding domain that facilitates pre-mRNA processing.,Szymczyna BR, Bowman J, McCracken S, Pineda-Lucena A, Lu Y, Cox B, Lambermon M, Graveley BR, Arrowsmith CH, Blencowe BJ Genes Dev. 2003 Feb 15;17(4):461-75. PMID:12600940[7]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

  1. ↑ Blencowe BJ, Issner R, Nickerson JA, Sharp PA. A coactivator of pre-mRNA splicing. Genes Dev. 1998 Apr 1;12(7):996-1009. PMID:9531537
  2. ↑ Eldridge AG, Li Y, Sharp PA, Blencowe BJ. The SRm160/300 splicing coactivator is required for exon-enhancer function. Proc Natl Acad Sci U S A. 1999 May 25;96(11):6125-30. PMID:10339552
  3. ↑ Blencowe BJ, Bauren G, Eldridge AG, Issner R, Nickerson JA, Rosonina E, Sharp PA. The SRm160/300 splicing coactivator subunits. RNA. 2000 Jan;6(1):111-20. PMID:10668804
  4. ↑ McCracken S, Lambermon M, Blencowe BJ. SRm160 splicing coactivator promotes transcript 3'-end cleavage. Mol Cell Biol. 2002 Jan;22(1):148-60. PMID:11739730
  5. ↑ McCracken S, Longman D, Johnstone IL, Caceres JF, Blencowe BJ. An evolutionarily conserved role for SRm160 in 3'-end processing that functions independently of exon junction complex formation. J Biol Chem. 2003 Nov 7;278(45):44153-60. Epub 2003 Aug 27. PMID:12944400 doi:http://dx.doi.org/10.1074/jbc.M306856200
  6. ↑ Szymczyna BR, Bowman J, McCracken S, Pineda-Lucena A, Lu Y, Cox B, Lambermon M, Graveley BR, Arrowsmith CH, Blencowe BJ. Structure and function of the PWI motif: a novel nucleic acid-binding domain that facilitates pre-mRNA processing. Genes Dev. 2003 Feb 15;17(4):461-75. PMID:12600940 doi:10.1101/gad.1060403
  7. ↑ Szymczyna BR, Bowman J, McCracken S, Pineda-Lucena A, Lu Y, Cox B, Lambermon M, Graveley BR, Arrowsmith CH, Blencowe BJ. Structure and function of the PWI motif: a novel nucleic acid-binding domain that facilitates pre-mRNA processing. Genes Dev. 2003 Feb 15;17(4):461-75. PMID:12600940 doi:10.1101/gad.1060403
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