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The splicing factor BBP interacts specifically with the pre-mRNA branchpoint sequence UACUAAC

J A Berglund1, K Chua, N Abovich

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The branchpoint bridging protein (BBP) binds to the UACUAAC sequence in yeast pre-mRNA. Its mammalian ortholog, SF1, also binds this sequence, suggesting BBP’s role in defining the branchpoint in both organisms.

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Area of Science:

  • Molecular Biology
  • RNA Splicing
  • Protein-RNA Interactions

Background:

  • The branchpoint sequence (UACUAAC) is crucial for pre-mRNA splicing in eukaryotes.
  • The yeast splicing factor BBP (branchpoint bridging protein) is known to interact with pre-mRNA near the branchpoint.
  • Mammalian splicing factor SF1 is homologous to yeast BBP and is part of the E complex.

Purpose of the Study:

  • To investigate the RNA-binding properties of yeast BBP.
  • To determine if BBP specifically recognizes the UACUAAC branchpoint sequence.
  • To compare the function of yeast BBP and its mammalian ortholog SF1 in branchpoint recognition.

Main Methods:

  • Recombinant yeast BBP protein was produced and tested for binding to RNA sequences.
  • RNA-binding assays were performed to assess the specificity of BBP for the UACUAAC sequence.
  • Comparative analysis of BBP and SF1 RNA-binding capabilities was conducted.

Main Results:

  • Recombinant yeast BBP directly recognizes and binds to the conserved UACUAAC branchpoint sequence.
  • Mammalian SF1 (mBBP) also exhibits specificity for the UACUAAC sequence.
  • Conservation of the branchpoint sequence and differences in RNA-binding between BBP and mBBP were observed.

Conclusions:

  • Yeast BBP functions as a branchpoint binding protein, directly recognizing the UACUAAC sequence.
  • Mammalian SF1 is a functional ortholog of BBP with conserved branchpoint sequence specificity.
  • BBP plays a significant role in defining the branchpoint sequence in both yeast and mammalian splicing.