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Detecting Cortex Fragments During Bacterial Spore Germination
Published on: June 25, 2016
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Bacterial spore surface nanoenvironment requires a AAA+ ATPase to promote MurG function
Thomas Delerue1, Taylor B Updegrove1, Sylvia Chareyre1
1Laboratory of Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892.
Summary
SpoVK protein is crucial for Bacillus subtilis spore assembly, acting as a chaperone to activate MurG and ensure proper cell wall formation during sporulation. It also functions in a developmental checkpoint to prevent sporulation arrest.
Area of Science:
- Microbiology
- Cell Biology
- Biochemistry
Background:
- Bacillus subtilis spores are formed within a mother cell, requiring specific proteins for surface assembly.
- The function of the sporulation-specific protein SpoVK in spore surface assembly remained unknown.
Purpose of the Study:
- To elucidate the function of SpoVK during Bacillus subtilis sporulation.
- To investigate SpoVK's role in spore surface assembly and its interaction with MurG.
Main Methods:
- Characterization of SpoVK as a sporulation-specific, forespore-localized AAA+ ATPase.
- Assessing the effect of SpoVK on MurG's peptidoglycan glycosyltransferase activity.
- Investigating the forespore's cytosolic nanoenvironment, including local pH changes.
- Analyzing SpoVK's role in a sporulation developmental checkpoint.
Main Results:
- SpoVK is identified as a chaperone that promotes MurG activity specifically during sporulation.
- A reduced pH in the forespore's cytosolic nanoenvironment was observed, potentially inhibiting MurG.
- SpoVK's mis-localization due to improper spore assembly triggers a sporulation arrest checkpoint.
Conclusions:
- SpoVK is essential for activating MurG in the unique sporulation nanoenvironment, facilitating peptidoglycan synthesis for spore assembly.
- SpoVK acts as a crucial component of a developmental checkpoint, ensuring correct spore surface formation and preventing developmental failure.
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