Sensitive detection of Bacillus anthracis using a binding protein originating from gamma-phage

Area of Science:

• Microbiology
• Biotechnology
• Biodefense

Background:

• Biological weapon detection is critical for national security and public safety.
• Bacillus anthracis (anthrax) detection remains a significant challenge, necessitating advanced diagnostic tools.
• Current detection methods like PCR and immunoassays have limitations in speed, cost, or complexity.

Purpose of the Study:

• To develop a novel, rapid, and sensitive bioprobe for Bacillus anthracis detection.
• To evaluate the efficacy of a recombinant gamma-phage lysin protein fragment (PlyGB) as a bioprobe.
• To compare the performance of the PlyGB-based assay with existing detection methods.

Main Methods:

• The C-terminal region of gamma-phage lysin protein (PlyG) was identified for its specific binding to B. anthracis.
• A recombinant protein fragment, PlyGB (positions 156-233), was engineered as a bioprobe.
• A membrane direct blot assay utilizing PlyGB was developed and tested.

Main Results:

• PlyGB demonstrated specific binding to the cell wall of Bacillus anthracis.
• The PlyGB-based membrane direct blot assay was faster and more sensitive than the gamma-phage test.
• The assay proved simpler and less expensive than PCR and antibody-based immunological methods, with comparable specificity.

Conclusions:

• Recombinant PlyGB serves as an effective bioprobe for Bacillus anthracis detection.
• The PlyGB assay offers a potent, cost-effective alternative to current diagnostic methods.
• This novel approach enhances capabilities for force protection and civilian safety against anthrax threats.