E. coli eavesdrops on neighboring bacteria to stabilize gut diversity

Add News Medical on Googleas a preferred source Hosei UniversityOct 14 2026Reviewed The stability of the human gut microbiome relies on interactions between different bacterial species. However, the specific molecular mechanisms of these interactions, particularly among non-dominant species, remain largely unexplored. In a new study, a research team from Hosei University, Japan, has discovered such an interaction, in which Escherichia coli detects metabolites from Bifidobacterium through a special sensory mechanism, forming a non-dominant communication network. This finding helps explain how gut microbiome diversity is maintained.

Our gut contains a microscopic world called the gut microbiome, teeming with hundreds of bacterial species and trillions of bacteria. These microorganisms influence many aspects of our 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.

However, 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 non-dominant 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 (E. coli) and Bifidobacterium, two non-dominant 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 Prof. 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 were published in Volume 16 of the journal Scientific Reports on August 25, 2026.

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 as "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. The Uhp system, especially, is a well-known two-component system dedicated to the sensing and transport of a special class of molecules, called hexose phosphates, particularly glucose-6-phosphate (G6P).

To further understand this interaction, the researchers focused on the Uhp system of E. coli. Experiments revealed that the Uhp system was only activated by metabolites released by Bifidobacterium and not by Bacteroides species, which dominate the gut microbiome. This suggests that the hexose phosphates, including G6P, that trigger the Uhp system are not simply universal byproducts of bacterial metabolism, but are specifically released by Bifidobacterium.

To confirm G6P as the main sensing molecule in the Bifidobacterium-derived metabolites, the researchers then employed an innovative kinetic trapping method. They treated Bifidobacterium-conditioned medium with both a fast-acting form of the enzyme G6P dehydrogenase and a slower-acting variant of the same enzyme. The fast-acting enzyme essentially metabolized G6P signals, significantly decreasing Uhp sensory activity compared to the slow-acting enzyme, providing strong evidence that G6P is the primary sensing molecule. The researchers also found that Bifidobacterium consistently releases G6P while metabolizing different sugars, indicating that it as a universal signal associated with Bifidobacterium metabolism.

Notably, the researchers suggest that since the G6P signal is short-lived, this communication can only happen if the two bacterial species live close to each other within 40 µm "spatial hub." This means that non-dominant bacteria in the gut might not live in isolation, but may form spatial hubs where different species interact using specific molecular links. Such non-dominant networks could help explain how diverse bacterial species coexist within the gut and contribute to the stability and resilience of the gut microbiome.

"Our results reveal a new model for microbiome regulation in the gut that contributes to the stabilization of the gut environment," notes Prof. Yamamoto. Looking ahead, he says, "This research could help with the development of next-generation probiotics designed to enhance beneficial microbial interactions. In addition, this could help with the development of targeted gut therapies, potentially allowing harmful bacteria to be suppressed while minimizing disruption to healthy gut flora."

By identifying the hidden interactions that shape the gut microbiome, this study could pave the way for the development of specialized gut therapies for different diseases that can enhance health and quality of life for all.

Ohno, T., et al. (2026). The Escherichia coli uhp two-component system functions as a sensory channel for hexose phosphates secreted by Bifidobacterium. Scientific Reports. DOI: 10.1038/s41598-026-64276-3. https://www.nature.com/articles/s41598-026-64276-3

Posted in: Molecular & Structural Biology | Life Sciences News | Histology & Microscopy

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