Screening lectin-binding specificity of bacterium by lectin microarray with gold nanoparticle probes

Area of Science:

• Biotechnology
• Microbiology
• Nanotechnology

Background:

• Lectins are proteins with specific carbohydrate-binding properties.
• Understanding microbe-lectin interactions is crucial for diagnostics and understanding pathogenesis.
• Existing methods for profiling these interactions can be low-throughput or lack sensitivity.

Purpose of the Study:

• To develop a novel, high-throughput lectin microarray for monitoring specific microbe-lectin affinities.
• To utilize gold nanoparticles and silver deposition for enhanced signal detection.
• To investigate how microbial growth conditions influence lectin binding.

Main Methods:

• Fabrication of a lectin microarray by immobilizing lectins on epoxide-derivatized glass slides.
• Capture of microbes by immobilized lectins.
• Detection of captured microbes using lectin-conjugated gold nanoparticles and silver deposition.
• Enhancement of resonance light scattering (RLS) for signal amplification.
• Profiling interactions between 16 lectins and four bacteria/one fungus.

Main Results:

• The developed lectin microarray effectively identified binding affinities between lectins and microbial species.
• The system demonstrated high sensitivity for bacterial detection.
• Significant changes in microbe-lectin binding affinities were observed based on microbial growth media.
• These binding affinity changes may have implications for microbial pathogenesis.

Conclusions:

• The gold-nanoparticle-labeled lectin microarray is a suitable tool for high-throughput analysis of microbe-lectin interactions.
• The method allows for sensitive identification of bacteria and fungi.
• Environmental factors, such as culture media, significantly modulate microbial surface properties affecting lectin binding.
• This finding has potential relevance for understanding microbial virulence and host-pathogen interactions.