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Medeiros M, Castro VHLD, Mota ALADA, Pereira MG, De Martinis ECP, Perecmanis S, Santana AP. Assessment of Internalin A Gene Sequences and Cell Adhesion and Invasion Capacity of Listeria monocytogenes Strains Isolated from Foods of Animal and Related Origins. Foodborne Pathog Dis 2020; 18:243-252. [PMID: 33337940 DOI: 10.1089/fpd.2020.2855] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Listeria monocytogenes is a foodborne pathogen of global relevance that causes outbreaks and sporadic cases of listeriosis, acquired through the consumption of contaminated products, including milk or meat products and ready-to-eat meat products subjected to intensive handling. The objective of the present study was to classify L. monocytogenes isolated from various food-related sources in the Federal District of Brazil and surrounding areas to sequence internalin A (inlA) genes from these isolates and assess their adhesion and invasion capacity using Caco-2 cells. In addition, 15 were classified as group I, 3 as group II, and 7 classified as group IV. Premature stop codons (PMSCs) at the nucleotide position 976 (GAA→TAA) of the inlA gene were identified in 5 of the 25 isolates. Adhesion and invasion tests in Caco-2 cells showed that all the isolates were capable of adhesion and cellular invasion, with isolates containing PMSCs exhibiting on average higher invasion capacity than those without PMSCs (p = 0.041) and a median of adhesion very distinctive from those without stop codons. These results are the first report of PMSCs in the inlA gene of L. monocytogenes from the Federal District of Brazil and Brazil.
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Affiliation(s)
- Margareti Medeiros
- Food Molecular Microbiology Laboratory, ASS 128/10, Faculty of Agronomy and Veterinary Medicine, University of Brasília (UnB), Brasília, Brazil
| | - Virgilio Hipolito Lemos de Castro
- Food Molecular Microbiology Laboratory, ASS 128/10, Faculty of Agronomy and Veterinary Medicine, University of Brasília (UnB), Brasília, Brazil
| | - Ana Lourdes Arrais de Alencar Mota
- Food Molecular Microbiology Laboratory, ASS 128/10, Faculty of Agronomy and Veterinary Medicine, University of Brasília (UnB), Brasília, Brazil
| | | | | | - Simone Perecmanis
- Food Molecular Microbiology Laboratory, ASS 128/10, Faculty of Agronomy and Veterinary Medicine, University of Brasília (UnB), Brasília, Brazil
| | - Angela Patricia Santana
- Food Molecular Microbiology Laboratory, ASS 128/10, Faculty of Agronomy and Veterinary Medicine, University of Brasília (UnB), Brasília, Brazil
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King MT, Huh I, Shenai A, Brooks TM, Brooks CL. Structural basis of V HH-mediated neutralization of the food-borne pathogen Listeria monocytogenes. J Biol Chem 2018; 293:13626-13635. [PMID: 29976754 DOI: 10.1074/jbc.ra118.003888] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 07/01/2018] [Indexed: 12/12/2022] Open
Abstract
Listeria monocytogenes causes listeriosis, a potentially fatal food-borne disease. The condition is especially harmful to pregnant women. Listeria outbreaks can originate from diverse foods, highlighting the need for novel strategies to improve food safety. The first step in Listeria invasion is internalization of the bacteria, which is mediated by the interaction of the internalin family of virulence factors with host cell receptors. A crucial interaction for Listeria invasion of the placenta, and thus a target for therapeutic intervention, is between internalin B (InlB) and the receptor c-Met. Single-domain antibodies (VHH, also called nanobodies, or sdAbs) from camel heavy-chain antibodies are a novel solution for preventing Listeria infections. The VHH R303, R330, and R326 all bind InlB with high affinity; however, the molecular mechanism behind their mode of action was unknown. We demonstrate that despite a high degree of sequence and structural diversity, the VHH bind a single epitope on InlB. A combination of gentamicin protection assays and florescent microscopy establish that InlB-specific VHH inhibit Listeria invasion of HeLa cells. A high-resolution X-ray structure of VHH R303 in complex with InlB showed that the VHH binds at the c-Met interaction site on InlB, thereby acting as a competitive inhibitor preventing bacterial invasion. These results point to the potential of VHH as a novel class of therapeutics for the prevention of listeriosis.
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Affiliation(s)
- Moeko Toride King
- From the Department of Chemistry, California State University, Fresno, California 93740
| | - Ian Huh
- From the Department of Chemistry, California State University, Fresno, California 93740
| | - Akhilesh Shenai
- From the Department of Chemistry, California State University, Fresno, California 93740
| | - Teresa M Brooks
- From the Department of Chemistry, California State University, Fresno, California 93740
| | - Cory L Brooks
- From the Department of Chemistry, California State University, Fresno, California 93740
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Mostowy S, Janel S, Forestier C, Roduit C, Kasas S, Pizarro-Cerdá J, Cossart P, Lafont F. A role for septins in the interaction between the Listeria monocytogenes INVASION PROTEIN InlB and the Met receptor. Biophys J 2011; 100:1949-59. [PMID: 21504731 PMCID: PMC3077699 DOI: 10.1016/j.bpj.2011.02.040] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Revised: 02/08/2011] [Accepted: 02/22/2011] [Indexed: 10/18/2022] Open
Abstract
Septins are conserved GTPases that form filaments and are required for cell division. During interphase, septin filaments associate with cellular membrane and cytoskeleton networks, yet the functional significance of these associations have, to our knowledge, remained unknown. We recently discovered that different septins, SEPT2 and SEPT11, regulate the InlB-mediated entry of Listeria monocytogenes into host cells. Here we address the role of SEPT2 and SEPT11 in the InlB-Met interactions underlying Listeria invasion to explore how septins modulate surface receptor function. We observed that differences in InlB-mediated Listeria entry correlated with differences in Met surface expression caused by septin depletion. Using atomic force microscopy on living cells, we show that septin depletion significantly reduced the unbinding force of InlB-Met interaction and the viscosity of membrane tethers at locations where the InlB-Met interaction occurs. Strikingly, the same order of difference was observed for cells in which the actin cytoskeleton was disrupted. Consistent with a proposed role of septins in association with the actin cytoskeleton, we show that cell elasticity is decreased upon septin or actin inactivation. Septins are therefore likely to participate in anchorage of the Met receptor to the actin cytoskeleton, and represent a critical determinant in surface receptor function.
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Affiliation(s)
- Serge Mostowy
- Unité des Interactions Bactéries-Cellules, Institut Pasteur, Paris, France
- Institut National de la Santé et de la Recherche Médicale, U604, Paris, France
- Institut National de la Recherche Agronomique, USC2020, Paris, France
| | - Sébastien Janel
- Cellular Microbiology of Infectious Pathogens—Center for Infection and Immunity of Lille, Institut Pasteur de Lille, Lille, France
- Centre National de la Recherche Scientifique, UMR8204, Lille, France
- Institut National de la Santé et de la Recherche Médicale, U1019, Lille, France
- University Lille Nord-de-France, Lille, France
| | | | - Charles Roduit
- Laboratory of Physics of the Living Matter, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Sandor Kasas
- Laboratory of Physics of the Living Matter, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Javier Pizarro-Cerdá
- Unité des Interactions Bactéries-Cellules, Institut Pasteur, Paris, France
- Institut National de la Santé et de la Recherche Médicale, U604, Paris, France
- Institut National de la Recherche Agronomique, USC2020, Paris, France
| | - Pascale Cossart
- Unité des Interactions Bactéries-Cellules, Institut Pasteur, Paris, France
- Institut National de la Santé et de la Recherche Médicale, U604, Paris, France
- Institut National de la Recherche Agronomique, USC2020, Paris, France
| | - Frank Lafont
- Cellular Microbiology of Infectious Pathogens—Center for Infection and Immunity of Lille, Institut Pasteur de Lille, Lille, France
- Centre National de la Recherche Scientifique, UMR8204, Lille, France
- Institut National de la Santé et de la Recherche Médicale, U1019, Lille, France
- University Lille Nord-de-France, Lille, France
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Niemann HH. Structural insights into Met receptor activation. Eur J Cell Biol 2011; 90:972-81. [PMID: 21242015 DOI: 10.1016/j.ejcb.2010.11.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Revised: 11/24/2010] [Accepted: 11/25/2010] [Indexed: 11/25/2022] Open
Abstract
The receptor tyrosine kinase Met plays a pivotal role in vertebrate development and tissue regeneration, its deregulation contributes to cancer. Met is also targeted during the infection by the facultative intracellular bacterium Listeria monocytogenes. The mechanistic basis for Met activation by its natural ligand hepatocyte growth factor/scatter factor (HGF/SF) is only beginning to be understood at a structural level. Crystal structures of Met in complex with L. monocytogenes InlB suggest that Met dimerization by this bacterial invasion protein is mediated by a dimer contact of the ligand. Here, I review the structural basis of Met activation by InlB and highlight parallels and differences to the physiological Met ligand HGF/SF and its splice variant NK1.
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Affiliation(s)
- Hartmut H Niemann
- Department of Chemistry, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany.
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Screening of rationally designed oligopeptides for Listeria monocytogenes detection by means of a high density colorimetric microarray. Mikrochim Acta 2008. [DOI: 10.1007/s00604-008-0035-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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X-ray and Neutron Small-Angle Scattering Analysis of the Complex Formed by the Met Receptor and the Listeria monocytogenes Invasion Protein InlB. J Mol Biol 2008; 377:489-500. [PMID: 18262542 DOI: 10.1016/j.jmb.2008.01.027] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Revised: 01/07/2008] [Accepted: 01/08/2008] [Indexed: 02/04/2023]
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Bublitz M, Holland C, Sabet C, Reichelt J, Cossart P, Heinz DW, Bierne H, Schubert WD. Crystal structure and standardized geometric analysis of InlJ, a listerial virulence factor and leucine-rich repeat protein with a novel cysteine ladder. J Mol Biol 2008; 378:87-96. [PMID: 18343406 DOI: 10.1016/j.jmb.2008.01.100] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 01/18/2008] [Accepted: 01/22/2008] [Indexed: 02/09/2023]
Abstract
We report on the crystal structure of the internalin domain of InlJ, a virulence-associated surface protein of Listeria monocytogenes, at 2.7-A resolution. InlJ is a member of the internalin family of listerial cell surface proteins characterized by a common N-terminal domain. InlJ bears 15 leucine-rich repeats (LRRs), the same number as in InlA, the prototypical internalin family member. The LRRs of InlJ differ from those of other internalins by having 21, rather than 22, residues and by replacing 1 LRR-defining hydrophobic residue with a conserved cysteine. These cysteines stack to form an intramolecular ladder and regular hydrophobic interactions in consecutive repeats. Analyzing the curvature, twist, and lateral bending angles of InlJ and comparing these with several other LRR proteins, we provide a systematic geometric comparison of LRR protein structures (http://bragi2.helmholtz-hzi.de/Angulator/). These indicate that both cysteine and asparagine ladders stabilize the LRR fold, whereas substitutions in some repeat positions are more likely than others to induce changes in LRR geometry.
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Affiliation(s)
- Maike Bublitz
- Molecular Host Pathogen Interactions, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany
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Niemann HH, Jäger V, Butler PJG, van den Heuvel J, Schmidt S, Ferraris D, Gherardi E, Heinz DW. Structure of the human receptor tyrosine kinase met in complex with the Listeria invasion protein InlB. Cell 2007; 130:235-46. [PMID: 17662939 DOI: 10.1016/j.cell.2007.05.037] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2007] [Revised: 04/20/2007] [Accepted: 05/11/2007] [Indexed: 11/20/2022]
Abstract
The tyrosine kinase Met, the product of the c-met proto-oncogene and the receptor for hepatocyte growth factor/scatter factor (HGF/SF), mediates signals critical for cell survival and migration. The human pathogen Listeria monocytogenes exploits Met signaling for invasion of host cells via its surface protein InlB. We present the crystal structure of the complex between a large fragment of the human Met ectodomain and the Met-binding domain of InlB. The concave face of the InlB leucine-rich repeat region interacts tightly with the first immunoglobulin-like domain of the Met stalk, a domain which does not bind HGF/SF. A second contact between InlB and the Met Sema domain locks the otherwise flexible receptor in a rigid, signaling competent conformation. Full Met activation requires the additional C-terminal domains of InlB which induce heparin-mediated receptor clustering and potent signaling. Thus, although it elicits a similar cellular response, InlB is not a structural mimic of HGF/SF.
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Affiliation(s)
- Hartmut H Niemann
- Division of Structural Biology, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
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Wollert T, Heinz DW, Schubert WD. Thermodynamically reengineering the listerial invasion complex InlA/E-cadherin. Proc Natl Acad Sci U S A 2007; 104:13960-5. [PMID: 17715295 PMCID: PMC1955803 DOI: 10.1073/pnas.0702199104] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Biological processes essentially all depend on the specific recognition between macromolecules and their interaction partners. Although many such interactions have been characterized both structurally and biophysically, the thermodynamic effects of small atomic changes remain poorly understood. Based on the crystal structure of the bacterial invasion protein internalin (InlA) of Listeria monocytogenes in complex with its human receptor E-cadherin (hEC1), we analyzed the interface to identify single amino acid substitutions in InlA that would potentially improve the overall quality of interaction and hence increase the weak binding affinity of the complex. Dissociation constants of InlA-variant/hEC1 complexes, as well as enthalpy and entropy of binding, were quantified by isothermal titration calorimetry. All single substitutions indeed significantly increase binding affinity. Structural changes were verified crystallographically at < or =2.0-A resolution, allowing thermodynamic characteristics of single substitutions to be rationalized structurally and providing unique insights into atomic contributions to binding enthalpy and entropy. Structural and thermodynamic data of all combinations of individual substitutions result in a thermodynamic network, allowing the source of cooperativity between distant recognition sites to be identified. One such pair of single substitutions improves affinity 5,000-fold. We thus demonstrate that rational reengineering of protein complexes is possible by making use of physically distant hot spots of recognition.
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Affiliation(s)
| | - Dirk W. Heinz
- Division of Structural Biology, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
| | - Wolf-Dieter Schubert
- *Molecular Host–Pathogen Interactions
- To whom correspondence should be addressed. E-mail:
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Bierne H, Sabet C, Personnic N, Cossart P. Internalins: a complex family of leucine-rich repeat-containing proteins in Listeria monocytogenes. Microbes Infect 2007; 9:1156-66. [PMID: 17764999 DOI: 10.1016/j.micinf.2007.05.003] [Citation(s) in RCA: 195] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Listeria monocytogenes genome includes a large family of proteins harbouring leucine-rich repeats known as internalins (Inl). The generation of novel mutants and comparative analysis of Inl variability among Listeria and other bacterial genomes suggest that beyond the extensively-studied invasins, InlA and InlB, additional internalins also play important functions in the infectious process.
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Affiliation(s)
- H Bierne
- Unité des Interactions Bactéries-Cellules, INSERM U604, INRA USC2020, Institut Pasteur, F-75015 Paris, France.
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P80, the HinT interacting membrane protein, is a secreted antigen of Mycoplasma hominis. BMC Microbiol 2004; 4:46. [PMID: 15579213 PMCID: PMC539234 DOI: 10.1186/1471-2180-4-46] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Accepted: 12/06/2004] [Indexed: 11/28/2022] Open
Abstract
Background Mycoplasmas are cell wall-less bacteria which encode a minimal set of proteins. In Mycoplasma hominis, the genes encoding the surface-localized membrane complex P60/P80 are in an operon with a gene encoding a cytoplasmic, nucleotide-binding protein with a characteristic Histidine triad motif (HinT). HinT is found in both procaryotes and eukaryotes and known to hydrolyze adenosine nucleotides in eukaryotes. Immuno-precipitation and BIACore analysis revealed an interaction between HinT and the P80 domain of the membrane complex. As the membrane anchored P80 carries an N-terminal uncleaved signal peptide we have proposed that the N-terminus extends into the cytoplasm and interacts with the cytosolic HinT. Results Further characterization of P80 suggested that the 4.7 kDa signal peptide is protected from cleavage only in the membrane bound form. We found several proteins were released into the supernatant of a logarithmic phase mycoplasma culture, including P80, which was reduced in size by 10 kDa. Western blot analysis of recombinant P80 mutants expressed in E. coli and differing in the N-terminal region revealed that mutation of the +1 position of the mature protein (Asn to Pro) which is important for signal peptidase I recognition resulted in reduced P80 secretion. All other P80 variants were released into the supernatant, in general as a 74 kDa protein encompassing the helical part of P80. Incubation of M. hominis cells in phosphate buffered saline supplemented with divalent cations revealed that the release of mycoplasma proteins into the supernatant was inhibited by high concentrations of calciumions. Conclusions Our model for secretion of the P80 protein of M. hominis implies a two-step process. In general the P80 protein is transported across the membrane and remains complexed to P60, surface-exposed and membrane anchored via the uncleaved signal sequence. Loss of the 4.7 kDa signal peptide seems to be a pre-requisite for P80 secretion, which is followed by a proteolytic process leading to a helical 74 kDa product. We propose that this novel form of two-step secretion is one of the solutions to a life with a reduced gene set.
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