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Metabolic stress-induced programmed cell death in Xanthomonas
Surbhi Wadhawan1, Satyendra Gautam, Arun Sharma
1Bhabha Atomic Research Centre, Mumbai, India.
FEMS Microbiology Letters
|October 21, 2010
Summary
Soybean bacterial pustule pathogen Xanthomonas campestris pv. glycines (Xcg) undergoes programmed cell death (PCD) regulated by caspase-3. Metabolic stress, reactive oxygen species (ROS), and DNA gyrase are key factors in this PCD process.
Area of Science:
- Microbiology
- Plant Pathology
- Cell Biology
Background:
- Xanthomonas campestris pv. glycines (Xcg) causes bacterial pustule disease in soybean.
- Programmed cell death (PCD) is a crucial cellular process in bacteria, but its regulation in plant pathogens is not fully understood.
Purpose of the Study:
- To investigate the mechanisms regulating nutritionally controlled programmed cell death (PCD) in Xanthomonas campestris pv. glycines (Xcg).
- To identify key molecular players, including reactive oxygen species (ROS) and caspase activity, involved in Xcg PCD.
Main Methods:
- Metabolic stress indicators (NADH, ATP) were measured during PCD.
- Reactive oxygen species (ROS) accumulation was detected using fluorescent probes and spectroscopy.
- Caspase-3 activity was assessed, and ROS scavengers were used to evaluate their inhibitory effects.
- The role of electron transport chain uncouplers and DNA gyrase inhibitors was examined.
Main Results:
- Xcg cells undergoing PCD exhibited metabolic stress with increased NADH and ATP.
- Significant accumulation of ROS and activation of caspase-3 were observed during PCD.
- ROS scavengers and an electron transport chain uncoupler reduced ROS generation and inhibited PCD.
- Nalidixic acid, a DNA gyrase inhibitor, also suppressed PCD, suggesting gyrase involvement.
Conclusions:
- Nutritionally regulated PCD in Xcg is mediated by caspase-3 activation, triggered by metabolic stress and ROS generation.
- Electron leakage from the electron transport chain contributes to ROS production and subsequent PCD.
- Bacterial DNA gyrase plays a role in the regulation of Xcg programmed cell death.
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