title: Peptide-based communication system enables Escherichia coli to Bacillus megaterium interspecies signaling.
abstract: The use of mixtures of microorganisms, or microbial consortia, has the potential to improve the productivity and efficiency of increasingly complex bioprocesses. However, the use of microbial consortia has been limited by our ability to control and coordinate the behaviors of microorganisms in synthetic communities. Synthetic biologists have previously engineered cell-cell communication systems that employ machinery from bacterial quorum-sensing (QS) networks to enable population-level control of gene expression. However, additional communication systems, such as those that enable communication between different species of bacteria, are needed to enable the use of diverse species in microbial consortia for bioprocessing. Here, we use the agr QS system from Staphylococcus aureus to generate an orthogonal synthetic communication system between Gram-negative Escherichia coli and Gram-positive Bacillus megaterium that is based on the production and recognition of autoinducing peptides (AIPs). We describe the construction and characterization of two types of B. megaterium "receiver" cells, capable of AIP-dependent gene expression in response to AIPs that differ by a single amino acid. Further, we observed interspecies communication when these receiver cells were co-cultured with AIP-producing E. coli. We show that the two AIP-based systems exhibit differences in sensitivity and specificity that may be advantageous in tuning communication-dependent networks in synthetic consortia. These peptide-based communication systems will enable the coordination of gene expression, metabolic pathways and growth between diverse microbial species, and represent a key step towards the use of microbial consortia in bioprocessing and biomanufacturing.
authors.affiliation: Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Marchand
authors.forename: Cynthia H
authors.initials: CH
authors.lastname: Collins
mesh_terms: D001410:Bacillus megaterium / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism*; D056265:Microbial Interactions; D015398:Signal Transduction; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism
chemical_list: C095698:Agr protein, Staphylococcus aureus; D001426:Bacterial Proteins; D036341:Intercellular Signaling Peptides and Proteins; D015534:Trans-Activators
keywords: Bacillus megaterium; Escherichia coli; cell-cell communication; microbial consortia; synthetic biology