Bioactive exometabolites drive maintenance competition in simple bacterial communities

Chodkowski, John L.; Shade, Ashley

doi:10.1128/msystems.00064-24

Title: Bioactive exometabolites drive maintenance competition in simple bacterial communities

Journal Article · 15 April 2024 · mSystems

DOI: https://doi.org/10.1128/msystems.00064-24 · OSTI ID:2471093

^[1];

^[2]

Michigan State Univ., East Lansing, MI (United States)
University of Lyon, Villeurbanne (France)

During prolonged resource limitation, bacterial cells can persist in metabolically active states of non-growth. These maintenance periods, such as those experienced in stationary phase, can include upregulation of secondary metabolism and release of exometabolites into the local environment. As resource limitation is common in many environmental microbial habitats, we hypothesized that neighboring bacterial populations employ exometabolites to compete or cooperate during maintenance and that these exometabolite-facilitated interactions can drive community outcomes. Here, we evaluated the consequences of exometabolite interactions over the stationary phase among three environmental strains: Burkholderia thailandensis E264, Chromobacterium subtsugae ATCC 31532, and Pseudomonas syringae pv. tomato DC3000. We assembled them into synthetic communities that only permitted chemical interactions. We compared the responses (transcripts) and outputs (exometabolites) of each member with and without neighbors. We found that transcriptional dynamics were changed with different neighbors and that some of these changes were coordinated between members. The dominant competitor B. thailandensis consistently upregulated biosynthetic gene clusters to produce bioactive exometabolites for both exploitative and interference competition. These results demonstrate that competition strategies during maintenance can contribute to community-level outcomes. It also suggests that the traditional concept of defining competitiveness by growth outcomes may be narrow and that maintenance competition could be an additional or alternative measure.

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Research Organization:: USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2471093

Journal Information:: mSystems, Journal Name: mSystems Journal Issue: 4 Vol. 9; ISSN 2379-5077

Publisher:: American Society for MicrobiologyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Bioactive exometabolites drive maintenance competition in simple bacterial communities

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