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Identification of small molecule binding sites within proteins using phage display technology
D J Rodi1, G E Agoston, R Manon
1Department of Discovery Research, EntreMed, Inc., 9640 Medical Center Drive, Rockville, MD 20850, USA.
Combinatorial Chemistry & High Throughput Screening
|September 20, 2001
Summary
Phage-displayed peptides enable rapid mapping of molecular contacts between small molecules and protein targets. This technique identifies potential drug binding sites without needing 3D structural data, accelerating pharmaceutical development.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Small molecule ligands bind to protein targets through specific molecular contacts.
- Ligands with molecular weight >= 300 Da typically interact with continuous binding epitopes of 5 or more amino acid residues.
- Identifying these binding sites is crucial for drug development.
Purpose of the Study:
- To develop and validate a novel technique for identifying ligand binding sites on protein targets.
- To leverage affinity selection of phage-displayed peptides for mapping molecular interactions.
- To accelerate the discovery of novel small molecule pharmaceuticals.
Main Methods:
- Utilized affinity selection of phage-displayed peptide libraries against immobilized small molecules.
- Employed statistical analysis of sequenced peptides to identify regions of high similarity within protein targets.
- Validated the technique by mapping known binding sites for anticancer drugs and hyaluronan.
Main Results:
- Demonstrated that regions of high sequence similarity with affinity-selected peptides correlate with ligand binding sites.
- Successfully mapped contact residues for paclitaxel, docetaxel, 2-methoxyestradiol, and hyaluronan.
- Identified a novel paclitaxel receptor, validating the method's efficacy.
Conclusions:
- Phage-displayed peptides can effectively mimic binding properties of native proteins, independent of structural context.
- The developed technique offers a rapid, high-resolution method for identifying potential ligand binding sites.
- This approach has significant potential to expedite the development of new small molecule drugs.