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Śmiałek-Bartyzel J, Bzowska M, Mak P. Pro-inflammatory properties of aureocin A53. Microbes Infect 2024; 26:105365. [PMID: 38777105 DOI: 10.1016/j.micinf.2024.105365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 03/06/2024] [Accepted: 05/16/2024] [Indexed: 05/25/2024]
Abstract
Aureocin A53 is a peptide bacteriocin produced by an opportunistic pathogen Staphylococcus aureus strain A53. The spatial structure of aureocin, unlike its amino acid sequence, is similar to the bacteriocin BacSp222, which was recently found to have the ability to induce the inflammatory response in the host cells. The presented research aimed to verify such properties also for aureocin A53. We demonstrated that the synthetic aureocin has slight cytotoxic activity towards murine monocytic-macrophage cells. This molecule was also able to activate murine P388.D1 and RAW 264.7 cells to IFN-γ-dependent production of nitric oxide and to activate production of the pro-inflammatory cytokine - TNF. We also proved that the observed pro-inflammatory activity of the studied bacteriocin is related to the stimulation of the TLR2/TLR6 heterodimer and, consequently, activation of the NF-κB transcription factor. To sum up, A53 is the second bacteriocin described in the literature, showing the pro-inflammatory activity against murine macrophage-like cells.
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Affiliation(s)
- Justyna Śmiałek-Bartyzel
- Doctoral School of Exact and Natural Sciences, Jagiellonian University, Łojasiewicza 11 St., 30-348 Kraków, Poland; Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7 St., 30-387 Kraków, Poland
| | - Monika Bzowska
- Department of Cell Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7 St., 30-387 Kraków, Poland
| | - Paweł Mak
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7 St., 30-387 Kraków, Poland.
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Vega LA, Sansón-Iglesias M, Mukherjee P, Buchan K, Morrison G, Hohlt AE, Flores AR. LiaR-dependent gene expression contributes to antimicrobial responses in group A Streptococcus. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.04.588141. [PMID: 38617309 PMCID: PMC11014544 DOI: 10.1101/2024.04.04.588141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
The ability to sense and respond to host defenses is essential for pathogen survival. Some mechanisms involve two-component systems (TCS) that respond to host molecules, such as antimicrobial peptides (AMPs) and activate specific gene regulatory pathways to aid in survival. Alongside TCSs, bacteria coordinate cell division proteins, chaperones, cell wall sortases and secretory translocons at discrete locations within the cytoplasmic membrane, referred to as functional membrane microdomains (FMMs). In Group A Streptococcus (GAS), the FMM or "ExPortal" coordinates protein secretion, cell wall synthesis and sensing of AMP-mediated cell envelope stress via the LiaFSR three-component system. Previously we showed GAS exposure to a subset of AMPs (α-defensins) activates the LiaFSR system by disrupting LiaF and LiaS co-localization in the ExPortal, leading to increased LiaR phosphorylation, expression of the transcriptional regulator SpxA2, and altered GAS virulence gene expression. The mechanisms by which LiaFSR integrates cell envelope stress with responses to AMP activity and virulence are not fully elucidated. Here, we show the LiaFSR regulon is comprised of genes encoding SpxA2 and three membrane-associated proteins: a PspC domain-containing protein (PCP), the lipoteichoic acid-modifying protein LafB and the membrane protein insertase YidC2. Our data show phosphorylated LiaR induces transcription of these genes via a conserved operator, whose disruption attenuates GAS virulence and increases susceptibility to AMPs in a manner primarily dependent on differential expression of SpxA2. Our work expands understanding of the LiaFSR regulatory network in GAS and identifies targets for further investigation of mechanisms of cell envelope stress tolerance contributing to GAS pathogenesis.
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Garrett SR, Palmer T. The role of proteinaceous toxins secreted by Staphylococcus aureus in interbacterial competition. FEMS MICROBES 2024; 5:xtae006. [PMID: 38495077 PMCID: PMC10941976 DOI: 10.1093/femsmc/xtae006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 02/17/2024] [Accepted: 02/27/2024] [Indexed: 03/19/2024] Open
Abstract
Staphylococcus aureus is highly adapted to colonization of the mammalian host. In humans the primary site of colonization is the epithelium of the nasal cavity. A major barrier to colonization is the resident microbiota, which have mechanisms to exclude S. aureus. As such, S. aureus has evolved mechanisms to compete with other bacteria, one of which is through secretion of proteinaceous toxins. S. aureus strains collectively produce a number of well-characterized Class I, II, and IV bacteriocins as well as several bacteriocin-like substances, about which less is known. These bacteriocins have potent antibacterial activity against several Gram-positive organisms, with some also active against Gram-negative species. S. aureus bacteriocins characterized to date are sporadically produced, and often encoded on plasmids. More recently the type VII secretion system (T7SS) of S. aureus has also been shown to play a role in interbacterial competition. The T7SS is encoded by all S. aureus isolates and so may represent a more widespread mechanism of competition used by this species. T7SS antagonism is mediated by the secretion of large protein toxins, three of which have been characterized to date: a nuclease toxin, EsaD; a membrane depolarizing toxin, TspA; and a phospholipase toxin, TslA. Further study is required to decipher the role that these different types of secreted toxins play in interbacterial competition and colonization of the host.
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Affiliation(s)
- Stephen R Garrett
- Newcastle University Biosciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom
| | - Tracy Palmer
- Newcastle University Biosciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom
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García-Vela S, Guay LD, Rahman MRT, Biron E, Torres C, Fliss I. Antimicrobial Activity of Synthetic Enterocins A, B, P, SEK4, and L50, Alone and in Combinations, against Clostridium perfringens. Int J Mol Sci 2024; 25:1597. [PMID: 38338877 PMCID: PMC10855908 DOI: 10.3390/ijms25031597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/17/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
Multidrug-resistant Clostridium perfringens infections are a major threat to the poultry industry. Effective alternatives to antibiotics are urgently needed to prevent these infections and limit the spread of multidrug-resistant bacteria. The aim of the study was to produce by chemical synthesis a set of enterocins of different subgroups of class II bacteriocins and to compare their spectrum of inhibitory activity, either alone or in combination, against a panel of twenty C. perfringens isolates. Enterocins A, P, SEK4 (class IIa bacteriocins), B (unsubgrouped class II bacteriocin), and L50 (class IId leaderless bacteriocin) were produced by microwave-assisted solid-phase peptide synthesis. Their antimicrobial activity was determined by agar well diffusion and microtitration methods against twenty C. perfringens isolates and against other pathogens. The FICINDEX of different combinations of the selected enterocins was calculated in order to identify combinations with synergistic effects. The results showed that synthetic analogs of L50A and L50B were the most active against C. perfringens. These peptides also showed the broadest spectrum of activity when tested against other non-clostridial indicator strains, including Listeria monocytogenes, methicillin-resistant Staphylococcus aureus, Streptococcus suis, Streptococcus pyogenes, Enterococcus cecorum, Enterococcus faecalis, as well as Gram-negative bacteria (Campylobacter coli and Pseudomonas aeruginosa), among others. The selected synthetic enterocins were combined on the basis of their different mechanisms of action, and all combinations tested showed synergy or partial synergy against C. perfringens. In conclusion, because of their high activity against C. perfringens and other pathogens, the use of synthetic enterocins alone or as a consortium can be a good alternative to the use of antibiotics in the poultry sector.
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Affiliation(s)
- Sara García-Vela
- Area of Biochemistry and Molecular Biology, OneHealth-UR Research Group, University of La Rioja, 26006 Logrono, La Rioja, Spain;
- Department of Food Science, Laval University, Quebec, QC G1V 0A6, Canada
| | - Louis-David Guay
- Institute of Nutrition and Functional Foods, Laval University, Quebec, QC G1V 0A6, Canada; (L.-D.G.); (M.R.T.R.); (E.B.)
- Faculty of Pharmacy, Laval University, Quebec, QC G1V 0A6, Canada
- Laboratory of Medicinal Chemistry, CHU de Québec Research Center, Quebec, QC G1V 4G2, Canada
| | - Md Ramim Tanver Rahman
- Institute of Nutrition and Functional Foods, Laval University, Quebec, QC G1V 0A6, Canada; (L.-D.G.); (M.R.T.R.); (E.B.)
- Faculty of Pharmacy, Laval University, Quebec, QC G1V 0A6, Canada
- Laboratory of Medicinal Chemistry, CHU de Québec Research Center, Quebec, QC G1V 4G2, Canada
| | - Eric Biron
- Institute of Nutrition and Functional Foods, Laval University, Quebec, QC G1V 0A6, Canada; (L.-D.G.); (M.R.T.R.); (E.B.)
- Faculty of Pharmacy, Laval University, Quebec, QC G1V 0A6, Canada
- Laboratory of Medicinal Chemistry, CHU de Québec Research Center, Quebec, QC G1V 4G2, Canada
| | - Carmen Torres
- Area of Biochemistry and Molecular Biology, OneHealth-UR Research Group, University of La Rioja, 26006 Logrono, La Rioja, Spain;
| | - Ismail Fliss
- Department of Food Science, Laval University, Quebec, QC G1V 0A6, Canada
- Institute of Nutrition and Functional Foods, Laval University, Quebec, QC G1V 0A6, Canada; (L.-D.G.); (M.R.T.R.); (E.B.)
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