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Updated: Jul 2, 2026
Single Cell Measurements of Vacuolar Rupture Caused by Intracellular Pathogens
Published on: June 12, 2013
The mycobacterial ATP burst is a lysis artifact and serves as an assay for drug-induced cell wall damage
Claire V Mulholland1, Bei Shi Lee2, Alexander Chong1
1Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Abstract:
Antibiotics targeting the mycobacterial cell wall are a cornerstone of tuberculosis treatment, yet how these drugs facilitate bacterial killing remains incompletely understood. Studies using the BacTiter-Glo luminescence assay have reported increased mycobacterial ATP levels following treatment with cell wall inhibitors such as isoniazid, a phenomenon referred to as an "ATP burst." This is proposed to contribute to drug-induced killing. Here, we show the ATP burst is not a biological response but rather an experimental artifact resulting from enhanced cell lysis induced by cell-wall-targeting drugs. Mechanical lysis by bead beating abolishes the ATP burst, enabling more reliable assessment of ATP levels. We demonstrate the utility of this approach as a functional readout for identifying compounds that disrupt the mycobacterial cell wall and for screening synergistic or antagonistic interactions with cell wall inhibitors. These findings clarify the mechanistic basis of the ATP burst and provide a practical tool for antimycobacterial drug discovery.
Insights
The "ATP burst" phenomenon in tuberculosis drug studies is an artifact of cell lysis, not a biological response. Mechanical lysis reveals true ATP levels, aiding antimycobacterial drug discovery.
Area of Science:
- Microbiology
- Drug Discovery
- Tuberculosis Research
Background:
- Cell wall targeting antibiotics are crucial for tuberculosis treatment.
- The "ATP burst" phenomenon, an increase in bacterial ATP levels, has been observed with these drugs and linked to bacterial killing.
- The precise mechanism behind the ATP burst and its role in drug efficacy are not fully understood.
Purpose of the Study:
- To investigate the mechanistic basis of the observed ATP burst in mycobacteria treated with cell wall inhibitors.
- To determine if the ATP burst is a genuine biological response or an experimental artifact.
- To develop a more reliable method for assessing drug effects on mycobacteria.
Main Methods:
- Utilized the BacTiter-Glo luminescence assay to measure ATP levels in mycobacteria.
- Compared ATP measurements with and without mechanical lysis (bead beating) after drug treatment.
- Assessed the utility of the modified assay for identifying novel cell wall-disrupting compounds and screening drug interactions.
Main Results:
- The study demonstrates that the "ATP burst" is an experimental artifact caused by enhanced cell lysis induced by cell-wall-targeting drugs.
- Mechanical lysis by bead beating effectively eliminates the artifact, allowing for accurate ATP level assessment.
- The refined method serves as a functional readout for identifying compounds that disrupt the mycobacterial cell wall.
Conclusions:
- The ATP burst is not a biological indicator of drug-induced killing but a result of experimental conditions.
- Mechanical lysis provides a more reliable method for evaluating the effects of antimycobacterial drugs.
- This approach offers a practical tool for advancing antimycobacterial drug discovery and understanding drug mechanisms.
