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Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
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Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads.

Patricia G Voss1, Kevin C Haudek1, Ronald J Patterson2

  • 1Department of Biochemistry and Molecular Biology, Michigan State University.

Journal of Visualized Experiments : Jove
|December 28, 2020
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Galectin-3 is essential for RNA splicing, acting through its interaction with U1 snRNP. This study demonstrates how galectin-3 incorporates into the splicing pathway via a pre-formed complex with U1 snRNP.

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Area of Science:

  • Molecular Biology
  • RNA Splicing Mechanisms
  • Protein-RNA Interactions

Background:

  • Galectin-3 has been identified as a necessary splicing factor in nuclear extracts.
  • The precise mechanism of galectin-3's involvement in the splicing pathway remains to be fully elucidated.

Purpose of the Study:

  • To investigate the mechanism by which galectin-3 is incorporated into the RNA splicing pathway.
  • To characterize the functional complex involving galectin-3 and U1 snRNP.

Main Methods:

  • Utilized glycerol gradient sedimentation to isolate endogenous particles containing galectin-3 and U1 snRNP from HeLa cell nuclear extracts.
  • Developed a protocol to deplete nuclear extracts of U1 snRNP, assessing the impact on splicing activity.
  • Employed an affinity-based reconstitution assay using anti-galectin-3 antibody-coupled agarose beads to restore splicing activity.

Main Results:

  • Identified and isolated a ~10S particle containing both galectin-3 and U1 snRNP.
  • Demonstrated that U1 snRNP depletion abolishes splicing activity.
  • Successfully reconstituted splicing activity in depleted extracts using the galectin-3-U1 snRNP complex.

Conclusions:

  • Galectin-3 enters the splicing pathway through its association with U1 snRNP, forming a functional ternary complex with pre-mRNA.
  • This galectin-3-U1 snRNP-pre-mRNA complex represents an E complex crucial for subsequent splicing events.
  • The developed method of using affinity-selected complexes for reconstitution is potentially applicable to studying other splicing factors.