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Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
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Galectin-3-U1 snRNP Complexes Initiate Splicing Activity in U1-Depleted Nuclear Extracts.

Patricia G Voss1, Kevin C Haudek1, Ronald J Patterson2

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA.

Methods in Molecular Biology (Clifton, N.J.)
|March 23, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals that galectin-3 binds to uracil-rich small nuclear ribonucleoprotein complexes (U snRNP), specifically U1 snRNP. These galectin-3-U1 snRNP complexes initiate the crucial splicing reaction in cellular extracts.

Keywords:
Cell-free splicing assayGlycerol gradient fractionationPre-mRNA splicingSpliceosomeU1 snRNP complex

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Area of Science:

  • Molecular Biology
  • RNA Processing
  • Gene Expression

Background:

  • Uracil-rich small nuclear ribonucleoprotein complexes (U snRNP) are essential for pre-mRNA splicing.
  • Galectin-3 is known to be involved in spliceosome assembly and splicing activity.

Purpose of the Study:

  • To investigate the association between U snRNP and galectin-3.
  • To determine the role of galectin-3-U1 snRNP complexes in initiating the splicing reaction.

Main Methods:

  • Glycerol gradient centrifugation of HeLa cell nuclear extracts.
  • Immunoprecipitation using galectin-3 specific antibodies.
  • Depletion-reconstitution studies.
  • Assay of splicing activity in U1-depleted nuclear extracts.

Main Results:

  • Endogenous U snRNP complexes fractionate into various particles, with 10S complexes containing U1 snRNP and galectin-3.
  • Galectin-3 specific antibodies coprecipitate U1 snRNP, confirming their association.
  • Purified galectin-3-U1 snRNP complexes initiate splicing in U1-depleted extracts, forming intermediates and mature mRNA.

Conclusions:

  • A fraction of U1 snRNP is associated with galectin-3 in nuclear extracts.
  • The galectin-3-U1 snRNP complex serves as a potential entry point for galectin-3 into the splicing pathway.
  • These complexes are capable of initiating the splicing reaction, highlighting their functional significance.