This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: The gut microbiome is teeming with hundreds of bacterial species and trillions of bacteria. These microorganisms influence many aspects of health, including digestion, and assist with numerous functions in the body.
Gut bacteria compete for the limited nutrients available in their environment, while also interacting with each other in ways that can influence the stability of the microbial community. Previous research has mainly focused on which bacteria are present and in what numbers, while the specific molecular mechanisms underlying their interaction and communication have largely remained a mystery. Moreover, research on gut microbiota dynamics has also often focused on dominant bacterial groups, leaving interactions between less abundant species relatively unexplored.
The persistence of these nondominant bacteria suggests that they may participate in specialized metabolic interactions that help them occupy specific niches. To explore this question, a research team led by professor Kaneyoshi Yamamoto from the Department of Frontier Bioscience and Research Institute of Micro-Nano Technology, Hosei University, Japan, investigated the interaction between Escherichia coli and Bifidobacterium, two nondominant bacterial groups that reside in our gut. "Traditionally, gut research has mostly focused on discovering the different species of bacteria in our gut.
We were, however, fascinated by the social life of these bacteria," explains Yamamoto. "We focused on E. coli and Bifidobacterium, which are two minority species in our gut. In this study, we have discovered a new mechanism through which one bacterium detects the metabolic activity of the other." Their findings are published in Scientific Reports.
Bifidobacterium species are good gut bacteria, known for their ability to break down complex carbohydrates such as human milk oligosaccharides (HMO). During this process, they release various metabolic byproducts into their surrounding environment. The researchers discovered that E. coli can detect specific molecules among these products using specialized sensory systems.
In this way, E. coli can obtain information about the metabolic activity of a neighboring bacterium from the chemical footprints it leaves behind and prepare its own metabolism accordingly. The authors termed this phenomenon "metabolic eavesdropping." To identify these sensory pathways, the researchers screened 54 different transport systems corresponding to 61 carbon sources utilized by E. coli. They found that it uses the Uhp and Idn sensory systems to monitor a complex cocktail of metabolic footprints released by Bifidobacterium.
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