Novel method for screening bacterial colonies for phosphatase activity

Area of Science:

• Microbiology
• Biochemistry
• Enzyme Assays

Background:

• Colorimetric assays are standard for screening bacterial phosphatase activity but have limitations.
• Existing methods lack real-time monitoring and differentiation of enzyme localization.

Purpose of the Study:

• To introduce a novel precipitating fluorescent probe for bacterial phosphatase activity screening.
• To overcome limitations of current colorimetric methods in sensitivity and specificity.

Main Methods:

• Development and incorporation of a precipitating fluorescent probe into agar plates.
• Culturing bacterial colonies directly on probe-containing agar.
• Monitoring fluorescence for phosphatase activity detection and localization.

Main Results:

• The fluorescent probe successfully detected and quantified phosphatase activity in bacterial colonies.
• The method enabled monitoring of enzyme activity development alongside colony growth.
• Distinction between cell-bound and cell-free phosphatase activity was achieved.
• Phosphatase-producing bacteria were successfully isolated from activated sludge samples.

Conclusions:

• The precipitating fluorescent probe offers a sensitive and versatile alternative to colorimetric assays for screening bacterial phosphatase activity.
• This innovative approach facilitates real-time assessment and enzyme localization, enhancing microbial screening.
• The probe is effective for isolating specific enzyme-producing bacteria from complex environmental samples.