Disruption of the bacterial OLE RNP complex impairs growth on alternative carbon sources

Area of Science:

• Microbiology
• Molecular Biology
• Biochemistry

Background:

• Ornate, large, extremophilic (OLE) RNAs form membrane-associated ribonucleoprotein (RNP) complexes in bacteria.
• These complexes are known to aid adaptation to environmental stresses like cold and high Mg²⁺.

Purpose of the Study:

• To investigate additional phenotypes of *Halalkalibacterium halodurans* strains lacking functional OLE RNP complexes.
• To understand the broader role of OLE RNP complexes in bacterial physiology.

Main Methods:

• Genetic disruption of OLE RNP complexes in *H. halodurans*.
• Growth characterization in minimal media with alternative carbon sources.
• Genetic suppressor selections in glutamate minimal media.

Main Results:

• OLE RNP complex disruption resulted in restricted growth on alternative carbon/energy sources.
• Suppressor mutations were identified in genes related to Mn²⁺ homeostasis (*ykoY*, *mntB*), phosphate homeostasis (*phoR*), and multidrug resistance (*bmrCD*).

Conclusions:

• The OLE RNP complex is involved in managing carbon/energy sources.
• OLE RNA plays a significant role in cellular adaptation to unfavorable conditions, impacting homeostasis and potentially protein secretion.