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A Lectin HPLC Method to Enrich Selectively-glycosylated Peptides from Complex Biological Samples
Published on: October 1, 2009
Gold nanoparticles conjugated with monosaccharide-modified peptide for lectin detection
Hiroshi Tsutsumi1, Hiroyuki Ohkusa, Hyejin Park
1Department of Bioengineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Nagatsuta-cho 4259 B-40, Midori-ku, Yokohama 226-8501, Japan.
Bioorganic & Medicinal Chemistry Letters
|October 11, 2012
Summary
Gold nanoparticles conjugated with mannose-modified peptides act as optical probes for detecting concanavalin A (ConA). Their aggregation with ConA causes a red shift, with activity influenced by peptide sequence.
Area of Science:
- Bioconjugation Chemistry
- Nanotechnology
- Biomedical Sensing
Background:
- Lectins, such as concanavalin A (ConA), play crucial roles in biological processes.
- Optical probes offer sensitive detection methods for biomolecules.
- Gold nanoparticles (GNPs) possess unique optical properties suitable for sensing applications.
Purpose of the Study:
- To develop novel optical probes for lectin detection using gold nanoparticles (GNPs).
- To investigate the conjugation of monosaccharide-modified peptides with GNPs.
- To evaluate the sensing capabilities of these glycopeptide-GNPs for specific lectin interactions.
Main Methods:
- Design and synthesis of mannose-modified peptides.
- Conjugation of mannose-modified peptides onto gold nanoparticles (GNPs).
- Spectroscopic analysis (UV-Vis) to detect aggregation upon interaction with concanavalin A (ConA).
Main Results:
- The synthesized glycopeptide-modified GNPs exhibited a significant red shift in their absorption maximum.
- This red shift was attributed to the aggregation of GNPs induced by the binding of concanavalin A (ConA).
- The aggregation activity demonstrated a sequence-dependent relationship with the amino acid surrounding the mannose unit in the glycopeptides.
Conclusions:
- Monosaccharide-modified peptide-conjugated GNPs are effective optical probes for concanavalin A (ConA) detection.
- The observed aggregation and spectral shift provide a basis for a sensitive lectin sensing platform.
- The amino acid sequence of the glycopeptide influences the probe's sensitivity and specificity towards ConA.
