Shallow breathing: bacterial life at low O(2)

Area of Science:

• Microbiology
• Environmental Science
• Genomics

Background:

• Microorganisms compete intensely for molecular oxygen (O(2)) due to its role as a potent electron acceptor.
• This competition creates microoxic environments in various natural and host-associated communities.
• Bacteria utilize high-affinity terminal oxidases to scavenge O(2) at nanomolar concentrations.

Purpose of the Study:

• To survey bacterial genomes and metagenomes for genes encoding high-affinity terminal oxidases.
• To understand the prevalence and diversity of bacteria capable of microoxic respiration.
• To explore the implications of microaerobic metabolism in host-associated bacteria.

Main Methods:

• Genome sequencing analysis
• Shotgun metagenomic surveys
• Phylogenetic analysis of bacterial genes

Main Results:

• Identified a diverse range of bacteria possessing genes for high-affinity terminal oxidases.
• Demonstrated the widespread distribution of bacteria adapted to microoxic conditions across various environments.
• Highlighted the phylogenetic diversity of these microaerobic bacteria.

Conclusions:

• Bacteria with the capacity for microoxic respiration are phylogenetically diverse and globally distributed.
• Microaerobic metabolism plays a significant role in bacterial communities, particularly in host-associated settings.
• Findings underscore the importance of microaerobic respiration in microbial ecology, health, and disease.