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Population and Single-Cell Analysis of Antibiotic Persistence in Escherichia coli

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Distinct single-cell morphological dynamics under beta-lactam antibiotics.

Zhizhong Yao¹, Daniel Kahne, Roy Kishony

¹Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.

|October 30, 2012

Summary

Beta-lactam antibiotics kill bacteria by disrupting cell wall synthesis, causing bulges that lead to cell lysis. The outer membrane stabilizes these bulges, influencing lysis rates and enabling potential recovery.

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Area of Science:

Microbiology
Cell Biology
Biophysics

Background:

The bacterial cell wall provides structural integrity against osmotic pressure.
Beta-lactam antibiotics inhibit cell wall synthesis, leading to bacterial lysis via bulge formation.
The precise dynamics and stability of beta-lactam-induced bulges remain poorly understood.

Purpose of the Study:

To investigate the formation dynamics and stability of bulges induced by beta-lactam antibiotics in bacteria.
To elucidate the roles of the cell wall and outer membrane in bacterial lysis mechanisms.
To characterize the stages of beta-lactam-mediated bacterial killing.

Main Methods:

Development of a high-time-resolution live-cell microscopy platform.
Integration of automated image analysis for capturing dynamic cellular processes.
Experimental manipulation of cell wall integrity and outer membrane function.

Main Results:

Bacterial lysis by beta-lactams occurs in four distinct stages: elongation, bulge formation, bulge stagnation, and lysis.
Cell wall perturbation and outer membrane integrity independently influence lysis modes and rates.
Outer membrane integrity is crucial for stabilizing bulges, delaying lysis, and allowing for potential cell recovery.

Conclusions:

Bulge formation dynamics are dictated by the specific perturbation of the bacterial cell wall.
The outer membrane plays a critical, independent role in bulge stabilization post-formation.
Stabilized bulges offer a window for bacterial recovery, even after beta-lactam exposure.