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PUF60: a novel U2AF65-related splicing activity
P S Page-McCaw1, K Amonlirdviman, P A Sharp
1Center for Cancer Research and Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA.
RNA (New York, N.Y.)
|December 22, 1999
Summary
Researchers discovered a new pyrimidine-tract binding factor (PUF), comprising PUF60 and p54 proteins, essential for RNA splicing. PUF, with U2AF, enhances U2 snRNP binding to pre-mRNA, a process dependent on U2AF65.
Area of Science:
- Molecular Biology
- RNA Splicing Mechanisms
Background:
- RNA splicing is a critical post-transcriptional modification process.
- Efficient splicing requires a complex interplay of protein factors and small nuclear ribonucleoproteins (snRNPs).
- The role of specific pyrimidine-tract binding factors in spliceosome assembly is not fully elucidated.
Purpose of the Study:
- To identify and characterize novel protein factors involved in RNA splicing.
- To elucidate the function of a newly identified pyrimidine-tract binding factor (PUF) in spliceosome assembly.
- To understand the interaction between PUF and other splicing factors like U2AF.
Main Methods:
- In vitro reconstitution assays for RNA splicing.
- Protein purification of splicing factors.
- Co-translation and complex formation analysis.
- Analysis of protein homology and domain structures.
Main Results:
- A novel pyrimidine-tract binding factor, PUF, was identified, consisting of PUF60 and p54.
- PUF, together with U2AF (specifically U2AF65), is required for efficient in vitro RNA splicing.
- PUF facilitates the association of U2 snRNP with pre-mRNA.
- PUF60 exhibits homology to U2AF65 and yeast splicing factor Mud2p, suggesting conserved functions.
Conclusions:
- PUF is a novel and essential component for efficient RNA splicing.
- PUF, in conjunction with U2AF65, plays a crucial role in the early stages of spliceosome assembly by promoting U2 snRNP binding.
- The structural homology of PUF60 suggests its involvement in conserved splicing pathways.