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Intrinsic U2AF binding is modulated by exon enhancer signals in parallel with changes in splicing activity
Z Wang1, H M Hoffmann, P J Grabowski
1Howard Hughes Medical Institute, University of Pittsburgh, Pennsylvania 15260, USA.
RNA (New York, N.Y.)
|March 1, 1995
Summary
Constitutive exons contain splicing signals that enhance 3' splice site activity. These exon enhancers recruit accessory factors, like SC35, to assist binding of the splicing protein U2AF, promoting efficient splicing.
Area of Science:
- Molecular Biology
- RNA Splicing Mechanisms
Background:
- Alternative and simple splicing are crucial for gene expression regulation.
- Understanding the role of exons in splicing is essential for deciphering gene regulation.
Purpose of the Study:
- To investigate the role of exons in splicing events.
- To elucidate the mechanism by which exons influence splice site activity.
Main Methods:
- Functional analysis of exon replacement mutations.
- RNA-protein binding assays using U2AF.
- Biochemical complementation and immunoprecipitation analysis.
Main Results:
- Constitutive exons possess signals that enhance 3' splice site activity.
- Exon enhancers recruit accessory factors, facilitating U2AF binding.
- The splicing factor SC35 is part of the exon enhancer complex.
Conclusions:
- Exons contain enhancer elements that promote splicing by assisting U2AF binding.
- An "assisted binding model" explains how exons enhance splice site recognition.
- These findings contribute to understanding functional exon-bridging interactions in splicing.