Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii
ABSTRACT Quorum sensing (QS) is a population density-dependent mechanism of intercellular communication, whereby microbes secrete and detect signals to regulate behaviors such as virulence and biofilm formation. Although QS is well-studied in bacteria, little is known about cell-cell communication i...
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American Society for Microbiology
2025-07-01
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| Series: | mBio |
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| Online Access: | https://journals.asm.org/doi/10.1128/mbio.00906-25 |
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| author | Priyanka Chatterjee Caroline E. Consoli Heather Schiller Kiersten K. Winter Monica E. McCallum Stefan Schulze Mechthild Pohlschroder |
| author_facet | Priyanka Chatterjee Caroline E. Consoli Heather Schiller Kiersten K. Winter Monica E. McCallum Stefan Schulze Mechthild Pohlschroder |
| author_sort | Priyanka Chatterjee |
| collection | DOAJ |
| description | ABSTRACT Quorum sensing (QS) is a population density-dependent mechanism of intercellular communication, whereby microbes secrete and detect signals to regulate behaviors such as virulence and biofilm formation. Although QS is well-studied in bacteria, little is known about cell-cell communication in archaea. The model archaeon Haloferax volcanii can transition from motile rod-shaped cells to non-motile disks as population density increases. In this report, we demonstrate that this transition is induced by a secreted small molecule present in cell-free conditioned medium (CM). The CM also elicits a response from a bacterial QS bioreporter, suggesting the potential for inter-domain crosstalk. To investigate the Hfx. volcanii QS response, we performed quantitative proteomics and detected significant differential abundances of 236 proteins in the presence of CM, including proteins involved in cell structure, motility, glycosylation, and two-component systems. We also demonstrate that a mutant lacking the cell shape regulatory factor DdfA does not undergo shape and motility transitions in the presence of CM, allowing us to identify protein abundance changes in the QS response pathway separate from those involved in shape and motility. In the ∆ddfA strain, only 110 proteins had significant differential abundance, and comparative analysis of these two proteomics experiments enabled us to identify proteins dependent on and independent of DdfA in the QS response pathway. Our study provides the first detailed analysis of QS pathways in any archaeon, strengthening our understanding of archaeal communication as well as providing the framework for studying intra- and interdomain crosstalk.IMPORTANCEUnderstanding the complex signaling networks in microbial communities has led to many invaluable applications in medicine and industry. Yet, while archaea are ubiquitous and play key roles in nutrient cycling, little is known about the roles of archaeal intra- and interspecies cell-cell communication in environments such as the human, soil, and marine microbiomes. In this study, we established the first robust system for studying quorum sensing in archaea by using the model archaeon Haloferax volcanii. We demonstrated that different behaviors, such as cell shape and motility, are mediated by a signal molecule, and we uncovered key regulatory components of the signaling pathway. This work advances our understanding of microbial communication, shedding light on archaeal intra- and interdomain interactions, and contributes to a more complete picture of the interconnected networks of life on Earth. |
| format | Article |
| id | doaj-art-786c3da3642c42b082ac13dbf7b523f5 |
| institution | Kabale University |
| issn | 2150-7511 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | American Society for Microbiology |
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| series | mBio |
| spelling | doaj-art-786c3da3642c42b082ac13dbf7b523f52025-08-20T03:28:10ZengAmerican Society for MicrobiologymBio2150-75112025-07-0116710.1128/mbio.00906-25Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcaniiPriyanka Chatterjee0Caroline E. Consoli1Heather Schiller2Kiersten K. Winter3Monica E. McCallum4Stefan Schulze5Mechthild Pohlschroder6Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USADepartment of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, USADepartment of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USACollege of Science, Gosnell School of Life Sciences, Rochester Institute of Technology, Rochester, New York, USADepartment of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, USADepartment of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USADepartment of Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USAABSTRACT Quorum sensing (QS) is a population density-dependent mechanism of intercellular communication, whereby microbes secrete and detect signals to regulate behaviors such as virulence and biofilm formation. Although QS is well-studied in bacteria, little is known about cell-cell communication in archaea. The model archaeon Haloferax volcanii can transition from motile rod-shaped cells to non-motile disks as population density increases. In this report, we demonstrate that this transition is induced by a secreted small molecule present in cell-free conditioned medium (CM). The CM also elicits a response from a bacterial QS bioreporter, suggesting the potential for inter-domain crosstalk. To investigate the Hfx. volcanii QS response, we performed quantitative proteomics and detected significant differential abundances of 236 proteins in the presence of CM, including proteins involved in cell structure, motility, glycosylation, and two-component systems. We also demonstrate that a mutant lacking the cell shape regulatory factor DdfA does not undergo shape and motility transitions in the presence of CM, allowing us to identify protein abundance changes in the QS response pathway separate from those involved in shape and motility. In the ∆ddfA strain, only 110 proteins had significant differential abundance, and comparative analysis of these two proteomics experiments enabled us to identify proteins dependent on and independent of DdfA in the QS response pathway. Our study provides the first detailed analysis of QS pathways in any archaeon, strengthening our understanding of archaeal communication as well as providing the framework for studying intra- and interdomain crosstalk.IMPORTANCEUnderstanding the complex signaling networks in microbial communities has led to many invaluable applications in medicine and industry. Yet, while archaea are ubiquitous and play key roles in nutrient cycling, little is known about the roles of archaeal intra- and interspecies cell-cell communication in environments such as the human, soil, and marine microbiomes. In this study, we established the first robust system for studying quorum sensing in archaea by using the model archaeon Haloferax volcanii. We demonstrated that different behaviors, such as cell shape and motility, are mediated by a signal molecule, and we uncovered key regulatory components of the signaling pathway. This work advances our understanding of microbial communication, shedding light on archaeal intra- and interdomain interactions, and contributes to a more complete picture of the interconnected networks of life on Earth.https://journals.asm.org/doi/10.1128/mbio.00906-25archaeaHaloferax volcaniiquorum sensingcell shapemotilityintercellular signaling |
| spellingShingle | Priyanka Chatterjee Caroline E. Consoli Heather Schiller Kiersten K. Winter Monica E. McCallum Stefan Schulze Mechthild Pohlschroder Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii mBio archaea Haloferax volcanii quorum sensing cell shape motility intercellular signaling |
| title | Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii |
| title_full | Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii |
| title_fullStr | Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii |
| title_full_unstemmed | Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii |
| title_short | Quorum sensing mediates morphology and motility transitions in the model archaeon Haloferax volcanii |
| title_sort | quorum sensing mediates morphology and motility transitions in the model archaeon haloferax volcanii |
| topic | archaea Haloferax volcanii quorum sensing cell shape motility intercellular signaling |
| url | https://journals.asm.org/doi/10.1128/mbio.00906-25 |
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