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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
Published on: July 25, 2013
A functional analysis of PCNA-binding peptides derived from protein sequence, interaction screening and rational
1Department of Surgery and Molecular Oncology, University of Dundee, Ninewells Hospital and Medical School, UK. c.warbrick@dundee.ac.uk
Oncogene
|January 13, 2006
Summary
Researchers developed peptide aptamers that inhibit proliferating cell nuclear antigen (PCNA) function, offering potential for new antiproliferative therapies.
Area of Science:
- Molecular Biology
- Cell Biology
Background:
- Proliferating cell nuclear antigen (PCNA) acts as a scaffold for DNA-interacting proteins.
- PCNA interaction is mediated by a conserved QxxLxxFF motif.
- Developing inhibitors of PCNA function is a target for antiproliferative therapies.
Purpose of the Study:
- To analyze the function of PCNA-binding peptides in inhibiting PCNA activity.
- To validate yeast as a screening system for identifying functional peptide aptamers in mammalian cells.
- To identify novel peptide aptamers as leads for antiproliferative drug development.
Main Methods:
- Two-hybrid screening in Schizosaccharomyces pombe to identify PCNA-interacting peptides.
- Expression of EGFP-fused peptides in both S. pombe and human cells.
- In vitro and in vivo affinity assays for PCNA-peptide binding.
Main Results:
- Identified PCNA-binding peptides, including pep102, that inhibit PCNA function via competitive binding.
- Demonstrated that yeast-derived peptide aptamers are functional in human cells.
- A rationally designed peptide (con1) showed high stability, potent inhibition of PCNA, and high affinity.
Conclusions:
- Peptide aptamers targeting PCNA can effectively inhibit its function.
- Yeast-based screening is a viable method for discovering functional peptide aptamers for mammalian cells.
- These findings support the development of small molecule antiproliferative therapies based on PCNA inhibition.
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