Efficient immobilization and patterning of live bacterial cells.

Area of Science:

• Microbiology
• Biotechnology
• Materials Science

Background:

• Bacterial cell patterning is crucial for various applications, including biosensing and microbial studies.
• Existing methods often lack specificity, efficiency, or the ability to maintain cell viability.
• Developing techniques for precise control over bacterial cell arrangement on surfaces is an ongoing challenge.

Purpose of the Study:

• To develop a highly specific and efficient method for patterning live bacterial cells on substrates.
• To investigate the self-sustaining growth and behavior of patterned bacterial monolayers.
• To demonstrate the utility of this method for bacterial species sorting.

Main Methods:

• Utilizing the interaction between CFA/I fimbriae on bacterial cells and specific antibodies immobilized on silicon and gold substrates.
• Patterning live bacterial cells, specifically Salmonella enterica serovar Typhimurium, with cellular resolution.
• Culturing the immobilized cells to form self-sustaining monolayers and observing their orientation changes.

Main Results:

• Achieved high-specificity and efficiency in patterning live bacterial cells.
• Demonstrated that immobilized bacteria can divide and form self-sustaining monolayers.
• Observed dynamic changes in bacterial cell orientation (lying-down to standing-up) in response to cell density.
• Successfully sorted a targeted bacterial species from a mixed culture within 2 hours.

Conclusions:

• The fimbriae-antibody interaction provides a robust platform for live bacterial cell patterning.
• The patterned bacterial monolayers are viable and capable of growth and dynamic behavior.
• This method offers a rapid and efficient approach for bacterial species isolation and potential applications in diagnostics and synthetic biology.