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Choi S, Lee Y, Park S, Jang SY, Park J, Oh DW, Kim SM, Kim TH, Lee GS, Cho C, Kim BS, Lee D, Kim EH, Cheong HK, Moon JH, Song JJ, Hwang J, Kim MH. Dissemination of pathogenic bacteria is reinforced by a MARTX toxin effector duet. Nat Commun 2024; 15:6218. [PMID: 39043696 PMCID: PMC11266601 DOI: 10.1038/s41467-024-50650-0] [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: 02/02/2024] [Accepted: 07/15/2024] [Indexed: 07/25/2024] Open
Abstract
Multiple bacterial genera take advantage of the multifunctional autoprocessing repeats-in-toxin (MARTX) toxin to invade host cells. Secretion of the MARTX toxin by Vibrio vulnificus, a deadly opportunistic pathogen that causes primary septicemia, the precursor of sepsis, is a major driver of infection; however, the molecular mechanism via which the toxin contributes to septicemia remains unclear. Here, we report the crystal and cryo-electron microscopy (EM) structures of a toxin effector duet comprising the domain of unknown function in the first position (DUF1)/Rho inactivation domain (RID) complexed with human targets. These structures reveal how the duet is used by bacteria as a potent weapon. The data show that DUF1 acts as a RID-dependent transforming NADase domain (RDTND) that disrupts NAD+ homeostasis by hijacking calmodulin. The cryo-EM structure of the RDTND-RID duet complexed with calmodulin and Rac1, together with immunological analyses in vitro and in mice, provide mechanistic insight into how V. vulnificus uses the duet to suppress ROS generation by depleting NAD(P)+ and modifying Rac1 in a mutually-reinforcing manner that ultimately paralyzes first line immune responses, promotes dissemination of invaders, and induces sepsis. These data may allow development of tools or strategies to combat MARTX toxin-related human diseases.
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Affiliation(s)
- Sanghyeon Choi
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Korea
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
| | - Youngjin Lee
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
| | - Shinhye Park
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
- Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon, 34134, Korea
| | - Song Yee Jang
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
- Core Research Facility & Analysis Center, KRIBB, Daejeon, 34141, Korea
| | - Jongbin Park
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
| | - Do Won Oh
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
- Graduate School of Medical Science and Engineering, KAIST, Daejeon, 34141, Korea
| | - Su-Man Kim
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
- Department of Biology Education, Chonnam National University, Gwangju, 61186, Korea
| | - Tae-Hwan Kim
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea
- College of Veterinary Medicine, Chungnam National University, Daejeon, 34134, Korea
| | - Ga Seul Lee
- Core Research Facility & Analysis Center, KRIBB, Daejeon, 34141, Korea
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk, 28644, Korea
| | - Changyi Cho
- Department of Food Science and Biotechnology, Ewha Womans University, Seoul, 03760, Korea
| | - Byoung Sik Kim
- Department of Food Science and Biotechnology, Ewha Womans University, Seoul, 03760, Korea
| | - Donghan Lee
- Korea Basic Science Institute, Cheongju, Chungbuk, 28119, Korea
| | - Eun-Hee Kim
- Korea Basic Science Institute, Cheongju, Chungbuk, 28119, Korea
| | - Hae-Kap Cheong
- Korea Basic Science Institute, Cheongju, Chungbuk, 28119, Korea
| | - Jeong Hee Moon
- Core Research Facility & Analysis Center, KRIBB, Daejeon, 34141, Korea
| | - Ji-Joon Song
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Korea
| | - Jungwon Hwang
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea.
| | - Myung Hee Kim
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Korea.
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Ruiz-Lara G, Costa-Silva TA, Muso-Cachumba JJ, Cevallos Espinel J, Fontes MG, Garcia-Maya M, Rahman KM, Rangel-Yagui CDO, Monteiro G. Nonclinical Evaluation of Single-Mutant E. coli Asparaginases Obtained by Double-Mutant Deconvolution: Improving Toxicological, Immune and Inflammatory Responses. Int J Mol Sci 2024; 25:6008. [PMID: 38892196 PMCID: PMC11172649 DOI: 10.3390/ijms25116008] [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: 04/18/2024] [Revised: 05/23/2024] [Accepted: 05/27/2024] [Indexed: 06/21/2024] Open
Abstract
Acute lymphoblastic leukaemia is currently treated with bacterial L-asparaginase; however, its side effects raise the need for the development of improved and efficient novel enzymes. Previously, we obtained low anti-asparaginase antibody production and high serum enzyme half-life in mice treated with the P40S/S206C mutant; however, its specific activity was significantly reduced. Thus, our aim was to test single mutants, S206C and P40S, through in vitro and in vivo assays. Our results showed that the drop in specific activity was caused by P40S substitution. In addition, our single mutants were highly stable in biological environment simulation, unlike the double-mutant P40S/S206C. The in vitro cell viability assay demonstrated that mutant enzymes have a higher cytotoxic effect than WT on T-cell-derived ALL and on some solid cancer cell lines. The in vivo assays were performed in mice to identify toxicological effects, to evoke immunological responses and to study the enzymes' pharmacokinetics. From these tests, none of the enzymes was toxic; however, S206C elicited lower physiological changes and immune/allergenic responses. In relation to the pharmacokinetic profile, S206C exhibited twofold higher activity than WT and P40S two hours after injection. In conclusion, we present bioengineered E. coli asparaginases with high specific enzyme activity and fewer side effects.
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Affiliation(s)
- Grace Ruiz-Lara
- Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Science, University of São Paulo, São Paulo 05508-000, SP, Brazil; (G.R.-L.); (J.J.M.-C.); (M.G.F.); (C.d.O.R.-Y.)
| | - Tales A. Costa-Silva
- Center for Natural and Human Sciences, Federal University of ABC, Santo André 09210-580, SP, Brazil;
| | - Jorge Javier Muso-Cachumba
- Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Science, University of São Paulo, São Paulo 05508-000, SP, Brazil; (G.R.-L.); (J.J.M.-C.); (M.G.F.); (C.d.O.R.-Y.)
| | | | - Marina Gabriel Fontes
- Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Science, University of São Paulo, São Paulo 05508-000, SP, Brazil; (G.R.-L.); (J.J.M.-C.); (M.G.F.); (C.d.O.R.-Y.)
| | - Mitla Garcia-Maya
- Randall Division of Cell and Molecular Biophysics, King’s College London, London SE1 1UL, UK;
| | | | - Carlota de Oliveira Rangel-Yagui
- Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Science, University of São Paulo, São Paulo 05508-000, SP, Brazil; (G.R.-L.); (J.J.M.-C.); (M.G.F.); (C.d.O.R.-Y.)
| | - Gisele Monteiro
- Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Science, University of São Paulo, São Paulo 05508-000, SP, Brazil; (G.R.-L.); (J.J.M.-C.); (M.G.F.); (C.d.O.R.-Y.)
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De Jesus R, Tratner AE, Madrid A, Rivera-Mondragón A, Navas GE, Lleonart R, Britton GB, Fernández PL. Body Temperature Drop as a Humane Endpoint in Snake Venom-Lethality Neutralization Tests. Toxins (Basel) 2023; 15:525. [PMID: 37755951 PMCID: PMC10535418 DOI: 10.3390/toxins15090525] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 08/01/2023] [Accepted: 08/22/2023] [Indexed: 09/28/2023] Open
Abstract
Snake venom neutralization potency tests are required for quality control assessment by manufacturers and regulatory authorities. These assays require the use of large numbers of mice that manifest severe signs associated with pain and distress and long periods of suffering. Despite this, many animals make a full recovery; therefore, the observation of clinical signs as a predictor of animal death is highly subjective and could affect the accuracy of the results. The use of a more objective parameter such as body temperature measurement could help establish a humane endpoint that would contribute to significantly reducing the suffering of large numbers of animals. We determined the temperature drop in BALB/c mice exposed to the mixtures of Bothrops asper or Lachesis stenophrys venom and a polyvalent antivenom by using an infrared thermometer. Our data show that, based on the temperature change from baseline, it is possible to predict which animals will survive during the first 3 h after inoculation. The data provided in this study may contribute to future reductions in animal suffering, in concordance with general trends in the use of laboratory animals for the quality control of biologicals.
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Affiliation(s)
- Rosa De Jesus
- Bioterio, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), City of Knowledge, Panama City 0843-01103, Panama; (R.D.J.); (A.M.)
| | - Adam E. Tratner
- Florida State University, Republic of Panama Campus, City of Knowledge, Panama City 0843-01103, Panama;
- Centro de Neurociencias, INDICASAT AIP, City of Knowledge, Panama City 0843-01103, Panama
| | - Alanna Madrid
- Bioterio, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), City of Knowledge, Panama City 0843-01103, Panama; (R.D.J.); (A.M.)
| | - Andrés Rivera-Mondragón
- Instituto Especializado de Análisis (IEA), Universidad de Panamá, Panama City P.O. Box 3366, Panama; (A.R.-M.); (G.E.N.)
| | - Goy E. Navas
- Instituto Especializado de Análisis (IEA), Universidad de Panamá, Panama City P.O. Box 3366, Panama; (A.R.-M.); (G.E.N.)
| | - Ricardo Lleonart
- Centro de Biología Celular y Molecular de Enfermedades, INDICASAT AIP, City of Knowledge, Panama City 0843-01103, Panama;
| | - Gabrielle B. Britton
- Centro de Neurociencias, INDICASAT AIP, City of Knowledge, Panama City 0843-01103, Panama
| | - Patricia L. Fernández
- Centro de Biología Celular y Molecular de Enfermedades, INDICASAT AIP, City of Knowledge, Panama City 0843-01103, Panama;
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Creasey HN, Zhang W, Widmer G. Effect of Caging on Cryptosporidium parvum Proliferation in Mice. Microorganisms 2022; 10:1242. [PMID: 35744762 PMCID: PMC9230662 DOI: 10.3390/microorganisms10061242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/13/2022] [Accepted: 06/15/2022] [Indexed: 02/01/2023] Open
Abstract
Cryptosporidiosis is an enteric infection caused by several protozoan species in the genus Cryptosporidium (phylum Apicomplexa). Immunosuppressed mice are commonly used to model this infection. Surprisingly, for a pathogen like Cryptosporidium parvum, which is readily transmitted fecal-orally, mice housed in the same cage can develop vastly different levels of infection, ranging from undetectable to lethal. The motivation for this study was to investigate this phenomenon and assess the association between the severity of cryptosporidiosis and the fecal microbiota. To this aim, the association between severity of cryptosporidiosis and caging (group caged vs. individually caged) and between the microbiota taxonomy and the course of the infection was examined. In contrast to mice caged in groups of four, a majority of mice caged individually did not excrete a detectable level of oocysts. Microbiota α diversity in samples collected between three days prior to infection and one day post-infection was negatively correlated with the severity of cryptosporidiosis, suggesting a causal negative relationship between microbiota diversity and susceptibility to C. parvum.
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Affiliation(s)
- Hannah N. Creasey
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, MA 01536, USA; (H.N.C.); (W.Z.)
| | - Wen Zhang
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, MA 01536, USA; (H.N.C.); (W.Z.)
- Gerald J. and Dorothy R. Friedman School of Nutrition, Tufts University, Boston, MA 02111, USA
| | - Giovanni Widmer
- Cummings School of Veterinary Medicine, Tufts University, North Grafton, MA 01536, USA; (H.N.C.); (W.Z.)
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5
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Chou YT, Lai FJ, Chang NS, Hsu LJ. Wwox Deficiency Causes Downregulation of Prosurvival ERK Signaling and Abnormal Homeostatic Responses in Mouse Skin. Front Cell Dev Biol 2020; 8:558432. [PMID: 33195192 PMCID: PMC7652735 DOI: 10.3389/fcell.2020.558432] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 10/09/2020] [Indexed: 11/24/2022] Open
Abstract
Deficiency of tumor suppressor WW domain-containing oxidoreductase (WWOX) in humans and animals leads to growth retardation and premature death during postnatal developmental stages. Skin integrity is essential for organism survival due to its protection against dehydration and hypothermia. Our previous report demonstrated that human epidermal suprabasal cells express WWOX protein, and the expression is gradually increased toward the superficial differentiated cells prior to cornification. Here, we investigated whether abnormal skin development and homeostasis occur under Wwox deficiency that may correlate with early death. We determined that keratinocyte proliferation and differentiation were decreased, while apoptosis was increased in Wwox–/– mouse epidermis and primary keratinocyte cultures and WWOX-knockdown human HaCaT cells. Without WWOX, progenitor cells in hair follicle junctional zone underwent massive proliferation in early postnatal developmental stages and the stem/progenitor cell pools were depleted at postnatal day 21. These events lead to significantly decreased epidermal thickness, dehydration state, and delayed hair development in Wwox–/– mouse skin, which is associated with downregulation of prosurvival MEK/ERK signaling in Wwox–/– keratinocytes. Moreover, Wwox depletion results in substantial downregulation of dermal collagen contents in mice. Notably, Wwox–/– mice exhibit severe loss of subcutaneous adipose tissue and significant hypothermia. Collectively, our knockout mouse model supports the validity of WWOX in assisting epidermal and adipose homeostasis, and the involvement of prosurvival ERK pathway in the homeostatic responses regulated by WWOX.
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Affiliation(s)
- Ying-Tsen Chou
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Feng-Jie Lai
- Department of Dermatology, Chimei Medical Center, Tainan, Taiwan.,Center for General Education, Southern Taiwan University of Science and Technology, Tainan, Taiwan
| | - Nan-Shan Chang
- Institute of Molecular Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Graduate Institute of Biomedical Sciences, College of Medicine, China Medical University, Taichung, Taiwan
| | - Li-Jin Hsu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
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Abstract
Sepsis continues to be a major challenge for modern medicine. Several preclinical models were developed to study sepsis and each has strengths and weaknesses. The cecal slurry (CS) method is a practical alternative because it does not require surgery, and the infection can be dosed. However, one disadvantage is that the dosage must be determined for each CS preparation using survival studies. Our aim was to refine a survival protocol for the CS model by determining a premonitory humane endpoint that would reduce animal suffering. Mice become hypothermic in sepsis; therefore, we tested whether reductions in surface temperature (Ts), measured by noninvasive infrared thermometry, could predict eventual death. We injected 154 C57BL/6J mice with CS (0.9-1.8 mg/g) and periodically monitored Ts at the xiphoid process over 5 days. We used, as predictors, combinations of temperature thresholds (29°C -31°C) and times, postinjection (18-36 h). A receiver-operator curve, sensitivity, and specificity were determined. A Distress Index value was calculated for the threshold conditions. The optimum detection threshold (highest Youden index) was found at Ts ≤ 30.5°C at 24 h (90% specific, 84% sensitive). This threshold condition reduced animal suffering by 41% while providing an accurate survival rate estimate. Using this threshold, only 13 of 154 mice would have died from sepsis; 67 would have been euthanized at 24 h, and only 7 of 154 would have been euthanized unnecessarily. In conclusion, using a humane endpoint of Ts ≤ 30.5°C at 24 h accurately predicts mortality and can effectively reduce animal suffering during CS survival protocols.
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Xie W, Xie J, Vince R, More SS. Guanabenz Attenuates Acetaminophen-Induced Liver Toxicity and Synergizes Analgesia in Mice. Chem Res Toxicol 2019; 33:162-171. [DOI: 10.1021/acs.chemrestox.9b00162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Wei Xie
- Center for Drug Design, College of Pharmacy, Academic Health Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Jiashu Xie
- Center for Drug Design, College of Pharmacy, Academic Health Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Robert Vince
- Center for Drug Design, College of Pharmacy, Academic Health Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Swati S. More
- Center for Drug Design, College of Pharmacy, Academic Health Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Gavin HE, Satchell KJF. RRSP and RID Effector Domains Dominate the Virulence Impact of Vibrio vulnificus MARTX Toxin. J Infect Dis 2019; 219:889-897. [PMID: 30289477 PMCID: PMC6386806 DOI: 10.1093/infdis/jiy590] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Accepted: 10/04/2018] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND The bacterial pathogen Vibrio vulnificus causes severe septic foodborne infections. The multifunctional autoprocessing repeats-in-toxins (MARTX) toxin is an important secreted virulence factor. The effector domain region is essential for lethal intestinal infection in mice, but the contribution of each of the 5 effector domains to infection has not been investigated. METHODS V. vulnificus mutants with varying effector domain content were inoculated intragastrically to mice, and the time to death was monitored to establish the contribution of each effector domain to overall virulence. Each strain was also tested for bacterial dissemination from the intestine to internal organs and for inhibition of phagocytosis. RESULTS The effector domain region was required for V. vulnificus to inhibit phagocytosis by J774 macrophages, but no single effector domain was required. No single MARTX effector domain was necessary for bacterial dissemination. Nonetheless, overall survival of infected mice differed with respect to the infecting V. vulnificus strain. Removal of rid or rrsp significantly reduced the virulence potential of V. vulnificus, while deletion of duf1 or abh accelerated the time to death. CONCLUSION Rho GTPases inactivation domain and Ras/Rap1-specific endopeptidase each exert greater effects on virulence than other MARTX domains, suggesting that modulation of the Rho/Ras family of GTPases is a critical function of the toxin during intestinal infection.
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Affiliation(s)
- Hannah E Gavin
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Karla J F Satchell
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
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Mei J, Riedel N, Grittner U, Endres M, Banneke S, Emmrich JV. Body temperature measurement in mice during acute illness: implantable temperature transponder versus surface infrared thermometry. Sci Rep 2018; 8:3526. [PMID: 29476115 PMCID: PMC5824949 DOI: 10.1038/s41598-018-22020-6] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 02/15/2018] [Indexed: 12/14/2022] Open
Abstract
Body temperature is a valuable parameter in determining the wellbeing of laboratory animals. However, using body temperature to refine humane endpoints during acute illness generally lacks comprehensiveness and exposes to inter-observer bias. Here we compared two methods to assess body temperature in mice, namely implanted radio frequency identification (RFID) temperature transponders (method 1) to non-contact infrared thermometry (method 2) in 435 mice for up to 7 days during normothermia and lipopolysaccharide (LPS) endotoxin-induced hypothermia. There was excellent agreement between core and surface temperature as determined by method 1 and 2, respectively, whereas the intra- and inter-subject variation was higher for method 2. Nevertheless, using machine learning algorithms to determine temperature-based endpoints both methods had excellent accuracy in predicting death as an outcome event. Therefore, less expensive and cumbersome non-contact infrared thermometry can serve as a reliable alternative for implantable transponder-based systems for hypothermic responses, although requiring standardization between experimenters.
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Affiliation(s)
- Jie Mei
- Department of Neurology and Department of Experimental Neurology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - Nico Riedel
- QUEST - Center for Transforming Biomedical Research, Berlin Institute of Health (BIH), Berlin, Germany
| | - Ulrike Grittner
- Center for Stroke Research, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Department of Biostatistics and Clinical Epidemiology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Matthias Endres
- Department of Neurology and Department of Experimental Neurology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.,Center for Stroke Research, Charité - Universitätsmedizin Berlin, Berlin, Germany.,German Center for Neurodegenerative Diseases (DZNE), Berlin, Germany.,German Center for Cardiovascular Research (DZHK), Berlin, Germany
| | - Stefanie Banneke
- German Federal Institute for Risk Assessment, German Center for the Protection of Laboratory Animals (Bf3R), Berlin, Germany
| | - Julius Valentin Emmrich
- Department of Neurology and Department of Experimental Neurology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.
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Woida PJ, Satchell KJF. Coordinated delivery and function of bacterial MARTX toxin effectors. Mol Microbiol 2017; 107:133-141. [PMID: 29114985 DOI: 10.1111/mmi.13875] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2017] [Indexed: 12/22/2022]
Abstract
Bacteria often coordinate virulence factors to fine-tune the host response during infection. These coordinated events can include toxins counteracting or amplifying effects of another toxin or though regulating the stability of virulence factors to remove their function once it is no longer needed. Multifunctional autoprocessing repeats-in toxin (MARTX) toxins are effector delivery toxins that form a pore into the plasma membrane of a eukaryotic cell to deliver multiple effector proteins into the cytosol of the target cell. The function of these proteins includes manipulating actin cytoskeletal dynamics, regulating signal transduction pathways and inhibiting host secretory pathways. Investigations into the molecular mechanisms of these effector domains are providing insight into how the function of some effectors overlap and regulate one another during infection. Coordinated crosstalk of effector function suggests that MARTX toxins are not simply a sum of all their parts. Instead, modulation of cell function by effector domains may depend on which other effector domain are co-delivered. Future studies will elucidate how these effectors interact with each other to modulate the bacterial host interaction.
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Affiliation(s)
- Patrick J Woida
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Karla J F Satchell
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
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