Development of SPQC Biosensor for Streptococcus pneumoniae Detection Based on IscB Nuclease Recognition

Area of Science:

• Microbiology
• Biotechnology
• Biosensor Technology

Background:

• Streptococcus pneumoniae is a leading cause of infectious disease mortality, particularly in children.
• Rapid and accurate detection of S. pneumoniae is critical for effective public health interventions.
• The IscB protein, an RNA-guided DNA endonuclease, shows promise for detecting specific DNA sequences and mismatches.

Purpose of the Study:

• To develop a novel biosensor for the rapid and sensitive detection of Streptococcus pneumoniae.
• To utilize the IscB protein's specific recognition capabilities for pathogen identification.
• To integrate rolling circle amplification and urease-catalyzed urea hydrolysis for enhanced detection.

Main Methods:

• Development of a novel series piezoelectric quartz crystal (SPQC) sensor.
• Specific recognition of S. pneumoniae using the IscB protein.
• Integration of rolling circle amplification and urease-catalyzed urea hydrolysis for signal amplification.

Main Results:

• The SPQC biosensor achieved rapid detection of S. pneumoniae nucleic acids within 3 hours.
• The sensor demonstrated a broad detection range from 10^3 to 10^8 CFU/mL.
• A low detection limit of 550 CFU/mL and excellent selectivity against common bacteria were achieved.

Conclusions:

• The developed IscB-based SPQC biosensor provides a rapid, sensitive, and selective method for S. pneumoniae detection.
• This platform shows significant potential for clinical diagnostic applications in managing S. pneumoniae infections.
• The integration of novel recognition and amplification strategies enhances biosensing capabilities for bacterial pathogens.