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Updated: Aug 1, 2026
08:48
Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
Published on: December 9, 2020
The yeast splicing factor Mud13p is a commitment complex component and corresponds to CBP20, the small subunit of the
H V Colot1, F Stutz, M Rosbash
1Howard Hughes Medical Institute, Brandeis University, Department of Biology, Waltham, Massachusetts 02254, USA.
Genes & Development
|July 1, 1996
Summary
This study identifies Mud13p, the yeast cap-binding complex (CBC) subunit, as a crucial splicing factor. It plays a role in early spliceosome assembly by interacting with pre-mRNA and other commitment complex components.
Area of Science:
- Molecular Biology
- RNA Splicing
- Gene Expression
Background:
- The initial recognition of pre-messenger RNA (pre-mRNA) by the splicing machinery is not fully understood.
- Yeast commitment complexes, containing pre-mRNA, U1 small nuclear ribonucleoprotein (snRNP), and Mud2p, are the earliest identified splicing complexes.
- These likely correspond to mammalian E complexes, which include pre-mRNA, U1 snRNP, and U2 splicing factor auxiliary factor (U2AF).
Purpose of the Study:
- To identify novel yeast commitment complex components.
- To investigate the role of the nuclear cap-binding complex (CBC) in pre-mRNA splicing.
- To elucidate the early steps of spliceosome assembly.
Main Methods:
- Characterization of yeast mutant strains exhibiting synthetic lethality with U1 small nuclear RNA (snRNA) mutations.
- Genetic and biochemical analysis of the delta-MUD13 yeast strain and its extracts.
- Comparative analysis with accompanying mammalian system results.
Main Results:
- MUD13, a nonessential gene, encodes the yeast homolog of CBP20, the small subunit of the nuclear cap-binding complex (CBC).
- Mud13p functions as a yeast splicing factor and is the second identified non-snRNP component of the commitment complex.
- Evidence suggests CBC interacts with other commitment complex factors and the pre-mRNA cap.
Conclusions:
- Cap-binding proteins, specifically CBC, are integral to early spliceosome assembly.
- The pre-mRNA cap and associated cap-binding proteins play a significant role in the initial stages of splicing.
- This finding advances the understanding of spliceosome formation mechanisms in yeast and mammals.
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