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Xu J, Wei Z, Fang W, Wu J, Wang Y, Chen S. KKL-35 inhibits growth of Staphylococcus aureus by systematically changing bacterial phenotypes. Arch Microbiol 2024; 206:350. [PMID: 38995446 DOI: 10.1007/s00203-024-04079-0] [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: 03/26/2024] [Accepted: 07/02/2024] [Indexed: 07/13/2024]
Abstract
KKL-35 is a new oxadiazole compound with potent broad-spectrum antibacterial activity against a number of gram-positive and gram-negative bacteria. However, its influences on bacterial growth are unclear. This study is to investigate phenotypic changes of Staphylococcus aureus (SA) caused by KKL-35 and evaluate antibacterial activity of combinations of KKL-35 with 7 class of antibiotics available in medical facilities. KKL-35-treated SA showed significantly lower survival under stresses of NaCl and H2O2 than DMSO (21.03 ± 2.60% vs. 68.21 ± 5.31% for NaCl, 4.91 ± 3.14% vs. 74.78 ± 2.88% for H2O2). UV exposure significantly decreased survival of SA treated with KKL-35 than DMSO-treated ones (23.91 ± 0.71% vs. 55.45 ± 4.70% for 4.2 J/m2, 12.80 ± 1.03% vs. 31.99 ± 5.99% for 7.0 J/m2, 1.52 ± 0.63% vs. 6.49 ± 0.51% for 14.0 J/m2). KKL-35 significantly decreased biofilm formation (0.47 ± 0.12 vs. 1.45 ± 0.21) and bacterial survival in the serum resistance assay (42.27 ± 2.77% vs. 78.31 ± 5.64%) than DMSO. KKL-35 significantly decreased ethidium bromide uptake and efflux, as well as the cell membrane integrity. KKL-35 had low cytotoxicity and low propensity for resistance. KKL-35 inhibited SA growth in concentration-independent and time-dependent manners, and showed additivity when combined with the majority class of available antibiotics. Antibiotic combinations of KKL-35 with ciprofloxacin, rifampicin, or linezolid significantly decreased bacterial loads than the most active antibiotic in the corresponding combination. Thus, KKL-35 inhibits growth of SA by decreasing bacterial environmental adaptations, biofilm formation, membrane uptake and efflux, as well as increasing antibiotic sensitivity. Its potent antibacterial activity, low cytotoxicity, low propensity for resistance, and wide choices in antibiotic combinations make KKL-35 a promising leading compound to design new antibiotics in monotherapies and combination therapies to treat bacterial infections.
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Affiliation(s)
- Jie Xu
- Department of Laboratory Medicine, The PLA 307 Clinical College, 5th Clinical Medical College of Anhui Medical University, Beijing, China
- Department of Laboratory Medicine, 5th Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Zilan Wei
- Department of Laboratory Medicine, 5th Medical Center of Chinese PLA General Hospital, Beijing, China
- Medical School of Chinese PLA, Beijing, China
| | - Wendong Fang
- Department of Laboratory Medicine, The PLA 307 Clinical College, 5th Clinical Medical College of Anhui Medical University, Beijing, China
- Department of Laboratory Medicine, 5th Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Jiahui Wu
- Department of Laboratory Medicine, 5th Medical Center of Chinese PLA General Hospital, Beijing, China
- Medical School of Chinese PLA, Beijing, China
| | | | - Shuiping Chen
- Department of Laboratory Medicine, The PLA 307 Clinical College, 5th Clinical Medical College of Anhui Medical University, Beijing, China.
- Department of Laboratory Medicine, 5th Medical Center of Chinese PLA General Hospital, Beijing, China.
- Medical School of Chinese PLA, Beijing, China.
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Naclerio GA, Onyedibe KI, Karanja CW, Aryal UK, Sintim HO. Comparative Studies to Uncover Mechanisms of Action of N-(1,3,4-Oxadiazol-2-yl)benzamide Containing Antibacterial Agents. ACS Infect Dis 2022; 8:865-877. [PMID: 35297603 PMCID: PMC9188027 DOI: 10.1021/acsinfecdis.1c00613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Drug-resistant bacterial pathogens still cause high levels of mortality annually despite the availability of many antibiotics. Methicillin-resistant Staphylococcus aureus (MRSA) is especially problematic, and the rise in resistance to front-line treatments like vancomycin and linezolid calls for new chemical modalities to treat chronic and relapsing MRSA infections. Halogenated N-(1,3,4-oxadiazol-2-yl)benzamides are an interesting class of antimicrobial agents, which have been described by multiple groups to be effective against different bacterial pathogens. The modes of action of a few N-(1,3,4-oxadiazol-2-yl)benzamides have been elucidated. For example, oxadiazoles KKL-35 and MBX-4132 have been described as inhibitors of trans-translation (a ribosome rescue pathway), while HSGN-94 was shown to inhibit lipoteichoic acid (LTA). However, other similarly halogenated N-(1,3,4-oxadiazol-2-yl)benzamides neither inhibit trans-translation nor LTA biosynthesis but are potent antimicrobial agents. For example, HSGN-220, -218, and -144 are N-(1,3,4-oxadiazol-2-yl)benzamides that are modified with OCF3, SCF3, or SF5 and have remarkable minimum inhibitory concentrations ranging from 1 to 0.06 μg/mL against MRSA clinical isolates and show a low propensity to develop resistance to MRSA over 30 days. The mechanism of action of these highly potent oxadiazoles is however unknown. To provide insights into how these halogenated N-(1,3,4-oxadiazol-2-yl)benzamides inhibit bacterial growth, we performed global proteomics and RNA expression analysis of some essential genes of S. aureus treated with HSGN-220, -218, and -144. These studies revealed that the oxadiazoles HSGN-220, -218, and -144 are multitargeting antibiotics that regulate menaquinone biosynthesis and other essential proteins like DnaX, Pol IIIC, BirA, LexA, and DnaC. In addition, these halogenated N-(1,3,4-oxadiazol-2-yl)benzamides were able to depolarize bacterial membranes and regulate siderophore biosynthesis and heme regulation. Iron starvation appears to be part of the mechanism of action that led to bacterial killing. This study demonstrates that N-(1,3,4-oxadiazol-2-yl)benzamides are indeed privileged scaffolds for the development of antibacterial agents and that subtle modifications lead to changes to the mechanism of action.
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Affiliation(s)
- George A. Naclerio
- Chemistry Department, Institute for Drug Discovery, Purdue University, West Lafayette, Indiana 47907, United States
| | - Kenneth I. Onyedibe
- Chemistry Department, Institute for Drug Discovery, Purdue University, West Lafayette, Indiana 47907, United States
- Purdue Institute for Inflammation, Immunology, and Infectious Diseases, West Lafayette, Indiana 47907, United States
| | - Caroline W. Karanja
- Chemistry Department, Institute for Drug Discovery, Purdue University, West Lafayette, Indiana 47907, United States
| | - Uma K. Aryal
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, United States
- Purdue Proteomics Facility, Bindley Bioscience Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Herman O. Sintim
- Chemistry Department, Institute for Drug Discovery, Purdue University, West Lafayette, Indiana 47907, United States
- Purdue Institute for Inflammation, Immunology, and Infectious Diseases, West Lafayette, Indiana 47907, United States
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Campos-Silva R, D’Urso G, Delalande O, Giudice E, Macedo AJ, Gillet R. Trans-Translation Is an Appealing Target for the Development of New Antimicrobial Compounds. Microorganisms 2021; 10:3. [PMID: 35056452 PMCID: PMC8778911 DOI: 10.3390/microorganisms10010003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/09/2021] [Accepted: 12/16/2021] [Indexed: 01/06/2023] Open
Abstract
Because of the ever-increasing multidrug resistance in microorganisms, it is crucial that we find and develop new antibiotics, especially molecules with different targets and mechanisms of action than those of the antibiotics in use today. Translation is a fundamental process that uses a large portion of the cell's energy, and the ribosome is already the target of more than half of the antibiotics in clinical use. However, this process is highly regulated, and its quality control machinery is actively studied as a possible target for new inhibitors. In bacteria, ribosomal stalling is a frequent event that jeopardizes bacterial wellness, and the most severe form occurs when ribosomes stall at the 3'-end of mRNA molecules devoid of a stop codon. Trans-translation is the principal and most sophisticated quality control mechanism for solving this problem, which would otherwise result in inefficient or even toxic protein synthesis. It is based on the complex made by tmRNA and SmpB, and because trans-translation is absent in eukaryotes, but necessary for bacterial fitness or survival, it is an exciting and realistic target for new antibiotics. Here, we describe the current and future prospects for developing what we hope will be a novel generation of trans-translation inhibitors.
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Affiliation(s)
- Rodrigo Campos-Silva
- CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, University of Rennes, 35000 Rennes, France; (R.C.-S.); (G.D.); (O.D.); (E.G.)
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia and Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre 90610-000, Brazil;
| | - Gaetano D’Urso
- CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, University of Rennes, 35000 Rennes, France; (R.C.-S.); (G.D.); (O.D.); (E.G.)
| | - Olivier Delalande
- CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, University of Rennes, 35000 Rennes, France; (R.C.-S.); (G.D.); (O.D.); (E.G.)
| | - Emmanuel Giudice
- CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, University of Rennes, 35000 Rennes, France; (R.C.-S.); (G.D.); (O.D.); (E.G.)
| | - Alexandre José Macedo
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia and Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre 90610-000, Brazil;
| | - Reynald Gillet
- CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, University of Rennes, 35000 Rennes, France; (R.C.-S.); (G.D.); (O.D.); (E.G.)
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Thépaut M, Campos-Silva R, Renard E, Barloy-Hubler F, Ennifar E, Boujard D, Gillet R. Safe and easy in vitro evaluation of tmRNA-SmpB-mediated trans-translation from ESKAPE pathogenic bacteria. RNA (NEW YORK, N.Y.) 2021; 27:1390-1399. [PMID: 34353925 PMCID: PMC8522692 DOI: 10.1261/rna.078773.121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
In bacteria, trans-translation is the major quality control system for rescuing stalled ribosomes. It is mediated by tmRNA, a hybrid RNA with properties of both a tRNA and a mRNA, and the small protein SmpB. Because trans-translation is absent in eukaryotes but necessary for bacterial fitness or survival, it is a promising target for the development of novel antibiotics. To facilitate screening of chemical libraries, various reliable in vitro and in vivo systems have been created for assessing trans-translational activity. However, the aim of the current work was to permit the safe and easy in vitro evaluation of trans-translation from pathogenic bacteria, which are obviously the ones we should be targeting. Based on green fluorescent protein (GFP) reassembly during active trans-translation, we have created a cell-free assay adapted to the rapid evaluation of trans-translation in ESKAPE bacteria, with 24 different possible combinations. It can be used for easy high-throughput screening of chemical compounds as well as for exploring the mechanism of trans-translation in these pathogens.
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Affiliation(s)
- Marion Thépaut
- Université Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR 6290, 35043 Rennes, France
- SATT Ouest-Valorisation, 35750 Rennes, France
| | - Rodrigo Campos-Silva
- Université Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR 6290, 35043 Rennes, France
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre 90610-000, Brazil
| | - Eva Renard
- Architecture et Réactivité de l'ARN-CNRS UPR 9002, Institut de Biologie Moléculaire et Cellulaire, Université de Strasbourg, 67084 Strasbourg, France
| | - Frédérique Barloy-Hubler
- Université Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR 6290, 35043 Rennes, France
| | - Eric Ennifar
- Architecture et Réactivité de l'ARN-CNRS UPR 9002, Institut de Biologie Moléculaire et Cellulaire, Université de Strasbourg, 67084 Strasbourg, France
| | - Daniel Boujard
- Université Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR 6290, 35043 Rennes, France
| | - Reynald Gillet
- Université Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR 6290, 35043 Rennes, France
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Müller C, Crowe-McAuliffe C, Wilson DN. Ribosome Rescue Pathways in Bacteria. Front Microbiol 2021; 12:652980. [PMID: 33815344 PMCID: PMC8012679 DOI: 10.3389/fmicb.2021.652980] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 02/23/2021] [Indexed: 12/18/2022] Open
Abstract
Ribosomes that become stalled on truncated or damaged mRNAs during protein synthesis must be rescued for the cell to survive. Bacteria have evolved a diverse array of rescue pathways to remove the stalled ribosomes from the aberrant mRNA and return them to the free pool of actively translating ribosomes. In addition, some of these pathways target the damaged mRNA and the incomplete nascent polypeptide chain for degradation. This review highlights the recent developments in our mechanistic understanding of bacterial ribosomal rescue systems, including drop-off, trans-translation mediated by transfer-messenger RNA and small protein B, ribosome rescue by the alternative rescue factors ArfA and ArfB, as well as Bacillus ribosome rescue factor A, an additional rescue system found in some Gram-positive bacteria, such as Bacillus subtilis. Finally, we discuss the recent findings of ribosome-associated quality control in particular bacterial lineages mediated by RqcH and RqcP. The importance of rescue pathways for bacterial survival suggests they may represent novel targets for the development of new antimicrobial agents against multi-drug resistant pathogenic bacteria.
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Affiliation(s)
| | | | - Daniel N. Wilson
- Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany
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Ren H, Liu Y, Zhou J, Long Y, Liu C, Xia B, Shi J, Fan Z, Liang Y, Chen S, Xu J, Wang P, Zhang Y, Zhu G, Liu H, Jin Y, Bai F, Cheng Z, Jin S, Wu W. Combination of Azithromycin and Gentamicin for Efficient Treatment of Pseudomonas aeruginosa Infections. J Infect Dis 2020; 220:1667-1678. [PMID: 31419286 DOI: 10.1093/infdis/jiz341] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 07/02/2019] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Trans-translation is a ribosome rescue system that plays an important role in bacterial tolerance to environmental stresses. It is absent in animals, making it a potential treatment target. However, its role in antibiotic tolerance in Pseudomonas aeruginosa remains unknown. METHODS The role and activity of trans-translation during antibiotic treatment were examined with a trans-translation-deficient strain and a genetically modified trans-translation component gene, respectively. In vitro assays and murine infection models were used to examine the effects of suppression of trans-translation. RESULTS We found that the trans-translation system plays an essential role in P. aeruginosa tolerance to azithromycin and multiple aminoglycoside antibiotics. We further demonstrated that gentamicin could suppress the azithromycin-induced activation of trans-translation. Compared with each antibiotic individually, gentamicin and azithromycin combined increased the killing efficacy against planktonic and biofilm-associated P. aeruginosa cells, including a reference strain PA14 and its isogenic carbapenem-resistance oprD mutant, the mucoid strain FRD1, and multiple clinical isolates. Furthermore, the gentamicin-azithromycin resulted in improved bacterial clearance in murine acute pneumonia, biofilm implant, and cutaneous abscess infection models. CONCLUSIONS Combination treatment with gentamicin and azithromycin is a promising strategy in combating P. aeruginosa infections.
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Affiliation(s)
- Huan Ren
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Yiwei Liu
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Jingyi Zhou
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Yuqing Long
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Chang Liu
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Bin Xia
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Jing Shi
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Zheng Fan
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Yuying Liang
- Department of Infection and Control, 307 hospital, Beijing, China
| | - Shuiping Chen
- Department of Infection and Control, 307 hospital, Beijing, China
| | - Jun Xu
- NHC Key Laboratory of Hormones and Development (Tianjin Medical University), Tianjin Key Laboratory of Metabolic Diseases, and Diabetic foot Department, Tianjin Medical University Metabolic Disease Hospital and Chu Hsien-I Memorial Hospital, Tianjin, China
| | - Penghua Wang
- NHC Key Laboratory of Hormones and Development (Tianjin Medical University), Tianjin Key Laboratory of Metabolic Diseases, and Diabetic foot Department, Tianjin Medical University Metabolic Disease Hospital and Chu Hsien-I Memorial Hospital, Tianjin, China
| | - Yanhong Zhang
- Nankai University Affiliated Hospital (Tianjin Forth Hospital), Tianjin, China
| | - Guangbo Zhu
- Tianjin Union Medical Center, Nankai University Affiliated Hospital, Tianjin, China
| | - Huimin Liu
- Tianjin Union Medical Center, Nankai University Affiliated Hospital, Tianjin, China
| | - Yongxin Jin
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Fang Bai
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Zhihui Cheng
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
| | - Shouguang Jin
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville
| | - Weihui Wu
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Molecular Microbiology and Technology of the Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin, China
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Guyomar C, Thépaut M, Nonin-Lecomte S, Méreau A, Goude R, Gillet R. Reassembling green fluorescent protein for in vitro evaluation of trans-translation. Nucleic Acids Res 2020; 48:e22. [PMID: 31919515 PMCID: PMC7038980 DOI: 10.1093/nar/gkz1204] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 12/11/2019] [Accepted: 12/17/2019] [Indexed: 12/12/2022] Open
Abstract
In order to discover new antibiotics with improved activity and selectivity, we created a reliable in vitro reporter system to detect trans-translation activity, the main mechanism for recycling ribosomes stalled on problematic messenger RNA (mRNA) in bacteria. This system is based on an engineered tmRNA variant that reassembles the green fluorescent protein (GFP) when trans-translation is active. Our system is adapted for high-throughput screening of chemical compounds by fluorescence.
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Affiliation(s)
- Charlotte Guyomar
- Univ. Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, Rennes, France
| | - Marion Thépaut
- Univ. Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, Rennes, France.,SATT Ouest-Valorisation, Rennes, France
| | | | - Agnès Méreau
- Univ. Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, Rennes, France
| | - Renan Goude
- Univ. Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, Rennes, France
| | - Reynald Gillet
- Univ. Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, Rennes, France
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8
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Tresse C, Radigue R, Gomes Von Borowski R, Thepaut M, Hanh Le H, Demay F, Georgeault S, Dhalluin A, Trautwetter A, Ermel G, Blanco C, van de Weghe P, Jean M, Giard JC, Gillet R. Synthesis and evaluation of 1,3,4-oxadiazole derivatives for development as broad-spectrum antibiotics. Bioorg Med Chem 2019; 27:115097. [DOI: 10.1016/j.bmc.2019.115097] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 09/06/2019] [Accepted: 09/09/2019] [Indexed: 10/26/2022]
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9
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Mileo E, Ilbert M, Barducci A, Bordes P, Castanié-Cornet MP, Garnier C, Genevaux P, Gillet R, Goloubinoff P, Ochsenbein F, Richarme G, Iobbi-Nivol C, Giudici-Orticoni MT, Gontero B, Genest O. Emerging fields in chaperone proteins: A French workshop. Biochimie 2018; 151:159-165. [PMID: 29890204 DOI: 10.1016/j.biochi.2018.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/06/2018] [Indexed: 10/14/2022]
Abstract
The "Bioénergétique et Ingénierie des Protéines (BIP)" laboratory, CNRS (France), organized its first French workshop on molecular chaperone proteins and protein folding in November 2017. The goal of this workshop was to gather scientists working in France on chaperone proteins and protein folding. This initiative was a great success with excellent talks and fruitful discussions. The highlights were on the description of unexpected functions and post-translational regulation of known molecular chaperones (such as Hsp90, Hsp33, SecB, GroEL) and on state-of-the-art methods to tackle questions related to this theme, including Cryo-electron microscopy, Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR), simulation and modeling. We expect to organize a second workshop in two years that will include more scientists working in France in the chaperone field.
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Affiliation(s)
- Elisabetta Mileo
- Aix Marseille Univ, CNRS, Laboratoire de Bioénergétique et Ingénierie des Protéines, Marseille, France
| | - Marianne Ilbert
- Aix Marseille Univ, CNRS, Laboratoire de Bioénergétique et Ingénierie des Protéines, Marseille, France
| | - Alessandro Barducci
- Centre de Biochimie Structurale (CBS), INSERM, CNRS, Université de Montpellier, Montpellier, France
| | - Patricia Bordes
- Laboratoire de Microbiologie et Génétique Moléculaires, Centre de Biologie Intégrative, CNRS, Université Paul-Sabatier, Toulouse, France
| | - Marie-Pierre Castanié-Cornet
- Laboratoire de Microbiologie et Génétique Moléculaires, Centre de Biologie Intégrative, CNRS, Université Paul-Sabatier, Toulouse, France
| | - Cyrille Garnier
- Mécanismes Moléculaires dans les Démences Neurodégénératives, Université de Montpellier, EPHE, INSERM, U1198, F-34095, Montpellier, France; Université de Rennes 1, France
| | - Pierre Genevaux
- Laboratoire de Microbiologie et Génétique Moléculaires, Centre de Biologie Intégrative, CNRS, Université Paul-Sabatier, Toulouse, France
| | - Reynald Gillet
- Univ. Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR) UMR6290, Rennes, France
| | - Pierre Goloubinoff
- Département de Biologie Moléculaire Végétale, Université de Lausanne, 1015, Lausanne, Switzerland
| | - Françoise Ochsenbein
- Institute for Integrative Biology of the Cell (I2BC), Joliot, CEA, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Gilbert Richarme
- UMR 8601 CNRS, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, Université Paris Descartes-Sorbonne Paris Cité, Paris, France
| | - Chantal Iobbi-Nivol
- Aix Marseille Univ, CNRS, Laboratoire de Bioénergétique et Ingénierie des Protéines, Marseille, France
| | | | - Brigitte Gontero
- Aix Marseille Univ, CNRS, Laboratoire de Bioénergétique et Ingénierie des Protéines, Marseille, France
| | - Olivier Genest
- Aix Marseille Univ, CNRS, Laboratoire de Bioénergétique et Ingénierie des Protéines, Marseille, France.
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KKL-35 Exhibits Potent Antibiotic Activity against Legionella Species Independently of trans-Translation Inhibition. Antimicrob Agents Chemother 2018; 62:AAC.01459-17. [PMID: 29158279 PMCID: PMC5786812 DOI: 10.1128/aac.01459-17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 11/04/2017] [Indexed: 11/20/2022] Open
Abstract
trans-Translation is a ribosome-rescue system that is ubiquitous in bacteria. Small molecules defining a new family of oxadiazole compounds that inhibit trans-translation have been found to have broad-spectrum antibiotic activity. We sought to determine the activity of KKL-35, a potent member of the oxadiazole family, against the human pathogen Legionella pneumophila and other related species that can also cause Legionnaires' disease (LD). Consistent with the essential nature of trans-translation in L. pneumophila, KKL-35 inhibited the growth of all tested strains at submicromolar concentrations. KKL-35 was also active against other LD-causing Legionella species. KKL-35 remained equally active against L. pneumophila mutants that have evolved resistance to macrolides. KKL-35 inhibited the multiplication of L. pneumophila in human macrophages at several stages of infection. No resistant mutants could be obtained, even during extended and chronic exposure. Surprisingly, KKL-35 was not synergistic with other ribosome-targeting antibiotics and did not induce the filamentation phenotype observed in cells defective for trans-translation. Importantly, KKL-35 remained active against L. pneumophila mutants expressing an alternate ribosome-rescue system and lacking transfer-messenger RNA, the essential component of trans-translation. These results indicate that the antibiotic activity of KKL-35 is not related to the specific inhibition of trans-translation and its mode of action remains to be identified. In conclusion, KKL-35 is an effective antibacterial agent against the intracellular pathogen L. pneumophila with no detectable resistance development. However, further studies are needed to better understand its mechanism of action and to assess further the potential of oxadiazoles in treatment.
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