Ribonuclease E strongly impacts bacterial adaptation to different growth conditions

Area of Science:

• Bacteriology
• Molecular Biology
• Microbial Physiology

Background:

• Bacterial adaptation relies on transcriptome changes, with transcriptional regulation well-studied.
• The role of ribonucleases, like RNase E, in bacterial adaptation is less understood.
• RNase E affects phototrophic growth in Rhodobacter sphaeroides, but not chemotrophic growth.

Purpose of the Study:

• To investigate the impact of RNase E on bacterial adaptation to various growth conditions.
• To quantify gene expression and map RNA 5' ends in Rhodobacter sphaeroides under different oxygen and light conditions.
• To elucidate the role of RNase E in regulating RNA levels and gene expression.

Main Methods:

• RNA sequencing (RNA-seq) to quantify gene expression.
• Mapping of RNA 5' ends.
• Comparative analysis of wild-type and RNase E thermosensitive mutant strains.

Main Results:

• RNase E significantly affects RNA levels, particularly for photosynthesis genes, correlating with growth defects.
• RNase E cleavage sites and 5' ends show distinct distributions across different RNA classes.
• RNase E influences the expression of transcription factors and their regulons.

Conclusions:

• RNase E plays a crucial role in Rhodobacter sphaeroides adaptation to diverse environmental conditions.
• RNase E's impact on RNA stability and gene expression is vital for bacterial survival and function.
• Understanding RNase E function provides insights into bacterial regulatory mechanisms.