1
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Cao M, Ma L, Yan C, Wang H, Ran M, Chen Y, Wang X, Liang X, Chai L, Li X. Mouse Ocilrp2/Clec2i negatively regulates LPS-mediated IL-6 production by blocking Dap12-Syk interaction in macrophage. Front Immunol 2022; 13:984520. [PMID: 36300111 PMCID: PMC9589251 DOI: 10.3389/fimmu.2022.984520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 09/20/2022] [Indexed: 11/24/2022] Open
Abstract
C-type lectin Ocilrp2/Clec2i is widely expressed in dendritic cells, lymphokine-activated killer cells and activated T cells. Previous studies have shown that Ocilrp2 is an important regulator in the activation of T cells and NK cells. However, the role of Ocilrp2 in the inflammatory responses by activated macrophages is currently unknown. This study investigated the expression of inflammatory cytokines in LPS-induced macrophages from primary peritoneal macrophages silenced by specific siRNA target Ocilrp2. Ocilrp2 was significantly downregulated in macrophages via NF-κB and pathways upon LPS stimuli or VSV infection. Silencing Ocilrp2 resulted in the increased expression of IL-6 in LPS-stimulated peritoneal macrophages and mice. Moreover, IL-6 expression was reduced in LPS-induced Ocilrp2 over-expressing iBMDM cells. Furthermore, we found that Ocilrp2-related Syk activation is responsible for expressing inflammatory cytokines in LPS-stimulated macrophages. Silencing Ocilrp2 significantly promotes the binding of Syk to Dap12. Altogether, we identified the Ocilrp2 as a critical role in the TLR4 signaling pathway and inflammatory macrophages’ immune regulation, and added mechanistic insights into the crosstalk between TLR and Syk signaling.
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Affiliation(s)
- Mingya Cao
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
- Institute of Translational Medicine, School of Basic Medical Sciences, Henan University, Kaifeng, China
| | - Lina Ma
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Chenyang Yan
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Han Wang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Mengzhe Ran
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Ying Chen
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Xiao Wang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Xiaonan Liang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Lihui Chai
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
- Institute of Translational Medicine, School of Basic Medical Sciences, Henan University, Kaifeng, China
- *Correspondence: Lihui Chai, ; Xia Li,
| | - Xia Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
- Institute of Translational Medicine, School of Basic Medical Sciences, Henan University, Kaifeng, China
- *Correspondence: Lihui Chai, ; Xia Li,
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2
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Bláha J, Skálová T, Kalousková B, Skořepa O, Cmunt D, Grobárová V, Pazicky S, Poláchová E, Abreu C, Stránský J, Kovaľ T, Dušková J, Zhao Y, Harlos K, Hašek J, Dohnálek J, Vaněk O. Structure of the human NK cell NKR-P1:LLT1 receptor:ligand complex reveals clustering in the immune synapse. Nat Commun 2022; 13:5022. [PMID: 36028489 PMCID: PMC9418145 DOI: 10.1038/s41467-022-32577-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Accepted: 08/05/2022] [Indexed: 11/23/2022] Open
Abstract
Signaling by the human C-type lectin-like receptor, natural killer (NK) cell inhibitory receptor NKR-P1, has a critical role in many immune-related diseases and cancer. C-type lectin-like receptors have weak affinities to their ligands; therefore, setting up a comprehensive model of NKR-P1-LLT1 interactions that considers the natural state of the receptor on the cell surface is necessary to understand its functions. Here we report the crystal structures of the NKR-P1 and NKR-P1:LLT1 complexes, which provides evidence that NKR-P1 forms homodimers in an unexpected arrangement to enable LLT1 binding in two modes, bridging two LLT1 molecules. These interaction clusters are suggestive of an inhibitory immune synapse. By observing the formation of these clusters in solution using SEC-SAXS analysis, by dSTORM super-resolution microscopy on the cell surface, and by following their role in receptor signaling with freshly isolated NK cells, we show that only the ligation of both LLT1 binding interfaces leads to effective NKR-P1 inhibitory signaling. In summary, our findings collectively support a model of NKR-P1:LLT1 clustering, which allows the interacting proteins to overcome weak ligand-receptor affinity and to trigger signal transduction upon cellular contact in the immune synapse. NKR-P1 is an inhibitory receptor on the surface of natural killer cells, and its engagement with the ligand LLT1 on activated monocytes and B cells triggers NK cell self-tolerance and other immunological processes. Here authors set up a comprehensive, structure-based model of NKR-P1-LLT1 interaction that involves NKR-P1 homodimer formation and subsequent bridging of two LLT1 molecules.
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Affiliation(s)
- Jan Bláha
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic.,EMBL, Hamburg Unit c/o DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Tereza Skálová
- Institute of Biotechnology, The Czech Academy of Sciences, BIOCEV Centre, Průmyslová 595, 25250, Vestec, Czech Republic
| | - Barbora Kalousková
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic.,Institute of Applied Physics - Biophysics group, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria
| | - Ondřej Skořepa
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic
| | - Denis Cmunt
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic.,Department of Oncology, Ludwig Institute for Cancer Research, University of Lausanne, Chemin des Boveresses 155, 1066, Epalinges, Switzerland
| | - Valéria Grobárová
- Department of Cell Biology, Faculty of Science, Charles University, Viničná 7, 12800, Prague, Czech Republic
| | - Samuel Pazicky
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic.,School of Biological Sciences, Nanyang Technological University, Nanyang Drive 60, 637551, Singapore, Singapore
| | - Edita Poláchová
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic
| | - Celeste Abreu
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic
| | - Jan Stránský
- Institute of Biotechnology, The Czech Academy of Sciences, BIOCEV Centre, Průmyslová 595, 25250, Vestec, Czech Republic
| | - Tomáš Kovaľ
- Institute of Biotechnology, The Czech Academy of Sciences, BIOCEV Centre, Průmyslová 595, 25250, Vestec, Czech Republic
| | - Jarmila Dušková
- Institute of Biotechnology, The Czech Academy of Sciences, BIOCEV Centre, Průmyslová 595, 25250, Vestec, Czech Republic
| | - Yuguang Zhao
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, OX3 7BN, Oxford, UK
| | - Karl Harlos
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, OX3 7BN, Oxford, UK
| | - Jindřich Hašek
- Institute of Biotechnology, The Czech Academy of Sciences, BIOCEV Centre, Průmyslová 595, 25250, Vestec, Czech Republic
| | - Jan Dohnálek
- Institute of Biotechnology, The Czech Academy of Sciences, BIOCEV Centre, Průmyslová 595, 25250, Vestec, Czech Republic
| | - Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12800, Prague, Czech Republic.
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3
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Vaněk O, Kalousková B, Abreu C, Nejadebrahim S, Skořepa O. Natural killer cell-based strategies for immunotherapy of cancer. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2022; 129:91-133. [PMID: 35305726 DOI: 10.1016/bs.apcsb.2022.02.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Natural killer (NK) cells are a family of lymphocytes with a natural ability to kill infected, harmed, or malignantly transformed cells. As these cells are part of the innate immunity, the cytotoxic mechanisms are activated upon recognizing specific patterns without prior antigen sensitization. This recognition is crucial for NK cell function in the maintenance of homeostasis and immunosurveillance. NK cells not only act directly toward malignant cells but also participate in the complex immune response by producing cytokines or cross-talk with other immune cells. Cancer may be seen as a break of all immune defenses when malignant cells escape the immunity and invade surrounding tissues creating a microenvironment supporting tumor progression. This process may be reverted by intervening immune response with immunotherapy, which may restore immune recognition. NK cells are important effector cells for immunotherapy. They may be used for adoptive cell transfer, genetically modified with chimeric antigen receptors, or triggered with appropriate antibodies and other antibody-fragment-based recombinant therapeutic proteins tailored specifically for NK cell engagement. NK cell receptors, responsible for target recognition and activation of cytotoxic response, could also be targeted in immunotherapy, for example, by various bi-, tri-, or multi-specific fusion proteins designed to bridge the gap between tumor markers present on target cells and activation receptors expressed on NK cells. However, this kind of immunoactive therapeutics may be developed only with a deep functional and structural knowledge of NK cell receptor: ligand interactions. This review describes the recent developments in the fascinating protein-engineering field of NK cell immunotherapeutics.
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Affiliation(s)
- Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic.
| | - Barbora Kalousková
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Celeste Abreu
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Shiva Nejadebrahim
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Ondřej Skořepa
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
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4
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Dohnálek J, Skálová T. C-type lectin-(like) fold - Protein-protein interaction patterns and utilization. Biotechnol Adv 2022; 58:107944. [PMID: 35301089 DOI: 10.1016/j.biotechadv.2022.107944] [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: 10/02/2021] [Revised: 03/04/2022] [Accepted: 03/07/2022] [Indexed: 11/02/2022]
Abstract
The C-type lectin-like fold (CTL fold) is a building block of many proteins, including saccharide-binding lectins, natural killer cell receptors, macrophage mannose receptor, selectins, collectins, snake venoms and others. Some are important players in innate immunity and are involved in the first-line response to virally infected cells or cancer cells, some play a role in antimicrobial defense, and some are potential targets for fight against problems connected with allergies, obesity, and autoimmunity. The structure of a CTL domain typically contains two α-helices, two small β-sheets and a long surface loop, with two or three disulfide bridges stabilizing the structure. This small domain is often involved in interactions with a target molecule, however, utilizing varied parts of the domain surface, with or without structural modifications. More than 500 three-dimensional structures of CTL fold-containing proteins are available in the Protein Data Bank, including a significant number of complexes with their key interacting partners (protein:protein complexes). The amount of available structural data enables a detailed analysis of the rules of interaction patterns utilized in activation, inhibition, attachment and other pathways or functionalities. Interpretation of known CTL receptor structures and all other CTL-containing proteins and complexes with described three-dimensional structures, complemented with sequence/structure/interaction correlation analysis offers a comprehensive view of the rules of interaction patterns of the CTL fold. The results are of value for prediction of interaction behavior of so far not understood CTL-containing proteins and development of new protein binders based on this fold, with applications in biomedicine or biotechnologies. It follows from the available structural data that almost the whole surface of the CTL fold is utilized in protein:protein interactions, with the heaviest frequency of utilization in the canonical interaction region. The individual categories of interactions differ in the interface buildup strategy. The strongest CTL binders rely on interfaces with large interaction area, presence of hydrophobic core, or high surface complementarity. The typical interaction surfaces of the fold are not conserved in amino acid sequence and can be utilized in design of new binders for biotechnological applications.
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Affiliation(s)
- Jan Dohnálek
- Institute of Biotechnology of the Czech Academy of Sciences, Biocev, Průmyslová 595, 25250 Vestec, Czech Republic.
| | - Tereza Skálová
- Institute of Biotechnology of the Czech Academy of Sciences, Biocev, Průmyslová 595, 25250 Vestec, Czech Republic
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5
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Kalousková B, Skořepa O, Cmunt D, Abreu C, Krejčová K, Bláha J, Sieglová I, Král V, Fábry M, Pola R, Pechar M, Vaněk O. Tumor Marker B7-H6 Bound to the Coiled Coil Peptide-Polymer Conjugate Enables Targeted Therapy by Activating Human Natural Killer Cells. Biomedicines 2021; 9:biomedicines9111597. [PMID: 34829829 PMCID: PMC8615638 DOI: 10.3390/biomedicines9111597] [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: 09/22/2021] [Revised: 10/29/2021] [Accepted: 10/30/2021] [Indexed: 01/02/2023] Open
Abstract
Targeted cancer immunotherapy is a promising tool for restoring immune surveillance and eradicating cancer cells. Hydrophilic polymers modified with coiled coil peptide tags can be used as universal carriers designed for cell-specific delivery of such biologically active proteins. Here, we describe the preparation of pHPMA-based copolymer conjugated with immunologically active protein B7-H6 via complementary coiled coil VAALEKE (peptide E) and VAALKEK (peptide K) sequences. Receptor B7-H6 was described as a binding partner of NKp30, and its expression has been proven for various tumor cell lines. The binding of B7-H6 to NKp30 activates NK cells and results in Fas ligand or granzyme-mediated apoptosis of target tumor cells. In this work, we optimized the expression of coiled coil tagged B7-H6, its ability to bind activating receptor NKp30 has been confirmed by isothermal titration calorimetry, and the binding stoichiometry of prepared chimeric biopolymer has been characterized by analytical ultracentrifugation. Furthermore, this coiled coil B7-H6-loaded polymer conjugate activates NK cells in vitro and, in combination with coiled coil scFv, enables their targeting towards a model tumor cell line. Prepared chimeric biopolymer represents a promising precursor for targeted cancer immunotherapy by activating the cytotoxic activity of natural killer cells.
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Affiliation(s)
- Barbora Kalousková
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
| | - Ondřej Skořepa
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
| | - Denis Cmunt
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
| | - Celeste Abreu
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
| | - Kateřina Krejčová
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
| | - Jan Bláha
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
| | - Irena Sieglová
- Institute of Molecular Genetics, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic; (I.S.); (V.K.); (M.F.)
| | - Vlastimil Král
- Institute of Molecular Genetics, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic; (I.S.); (V.K.); (M.F.)
| | - Milan Fábry
- Institute of Molecular Genetics, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic; (I.S.); (V.K.); (M.F.)
| | - Robert Pola
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 16206 Prague, Czech Republic; (R.P.); (M.P.)
| | - Michal Pechar
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 16206 Prague, Czech Republic; (R.P.); (M.P.)
| | - Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, 12840 Prague, Czech Republic; (B.K.); (O.S.); (D.C.); (C.A.); (K.K.); (J.B.)
- Correspondence:
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6
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Production of recombinant soluble dimeric C-type lectin-like receptors of rat natural killer cells. Sci Rep 2019; 9:17836. [PMID: 31780667 PMCID: PMC6882821 DOI: 10.1038/s41598-019-52114-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 10/14/2019] [Indexed: 12/02/2022] Open
Abstract
Working at the border between innate and adaptive immunity, natural killer (NK) cells play a key role in the immune system by protecting healthy cells and by eliminating malignantly transformed, stressed or virally infected cells. NK cell recognition of a target cell is mediated by a receptor “zipper” consisting of various activating and inhibitory receptors, including C-type lectin-like receptors. Among this major group of receptors, two of the largest rodent receptor families are the NKR-P1 and the Clr receptor families. Although these families have been shown to encode receptor-ligand pairs involved in MHC-independent self-nonself discrimination and are a target for immune evasion by tumour cells and viruses, structural mechanisms of their mutual recognition remain less well characterized. Therefore, we developed a non-viral eukaryotic expression system based on transient transfection of suspension-adapted human embryonic kidney 293 cells to produce soluble native disulphide dimers of NK cell C-type lectin-like receptor ectodomains. The expression system was optimized using green fluorescent protein and secreted alkaline phosphatase, easily quantifiable markers of recombinant protein production. We describe an application of this approach to the recombinant protein production and characterization of native rat NKR-P1B and Clr-11 proteins suitable for further structural and functional studies.
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7
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Peter EK, Černý J. A Hybrid Hamiltonian for the Accelerated Sampling along Experimental Restraints. Int J Mol Sci 2019; 20:E370. [PMID: 30654563 PMCID: PMC6359555 DOI: 10.3390/ijms20020370] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/07/2019] [Accepted: 01/10/2019] [Indexed: 12/25/2022] Open
Abstract
In this article, we present an enhanced sampling method based on a hybrid Hamiltonian which combines experimental distance restraints with a bias dependent from multiple path-dependent variables. This simulation method determines the bias-coordinates on the fly and does not require a priori knowledge about reaction coordinates. The hybrid Hamiltonian accelerates the sampling of proteins, and, combined with experimental distance information, the technique considers the restraints adaptively and in dependency of the system's intrinsic dynamics. We validate the methodology on the dipole relaxation of two water models and the conformational landscape of dialanine. Using experimental NMR-restraint data, we explore the folding landscape of the TrpCage mini-protein and in a second example apply distance restraints from chemical crosslinking/mass spectrometry experiments for the sampling of the conformation space of the Killer Cell Lectin-like Receptor Subfamily B Member 1A (NKR-P1A). The new methodology has the potential to adaptively introduce experimental restraints without affecting the conformational space of the system along an ergodic trajectory. Since only a limited number of input- and no-order parameters are required for the setup of the simulation, the method is broadly applicable and has the potential to be combined with coarse-graining methods.
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Affiliation(s)
- Emanuel K Peter
- Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Průmyslová 595, 252 50 Vestec, Prague West, Czech Republic.
| | - Jiří Černý
- Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Průmyslová 595, 252 50 Vestec, Prague West, Czech Republic.
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8
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Balaji GR, Aguilar OA, Tanaka M, Shingu-Vazquez MA, Fu Z, Gully BS, Lanier LL, Carlyle JR, Rossjohn J, Berry R. Recognition of host Clr-b by the inhibitory NKR-P1B receptor provides a basis for missing-self recognition. Nat Commun 2018; 9:4623. [PMID: 30397201 PMCID: PMC6218473 DOI: 10.1038/s41467-018-06989-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 10/09/2018] [Indexed: 01/16/2023] Open
Abstract
The interaction between natural killer (NK) cell inhibitory receptors and their cognate ligands constitutes a key mechanism by which healthy tissues are protected from NK cell-mediated lysis. However, self-ligand recognition remains poorly understood within the prototypical NKR-P1 receptor family. Here we report the structure of the inhibitory NKR-P1B receptor bound to its cognate host ligand, Clr-b. NKR-P1B and Clr-b interact via a head-to-head docking mode through an interface that includes a large array of polar interactions. NKR-P1B:Clr-b recognition is extremely sensitive to mutations at the heterodimeric interface, with most mutations severely impacting both Clr-b binding and NKR-P1B receptor function to implicate a low affinity interaction. Within the structure, two NKR-P1B:Clr-b complexes are cross-linked by a non-classic NKR-P1B homodimer, and the disruption of homodimer formation abrogates Clr-b recognition. These data provide an insight into a fundamental missing-self recognition system and suggest an avidity-based mechanism underpins NKR-P1B receptor function.
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MESH Headings
- Animals
- Carrier Proteins
- Crystallography, X-Ray
- HEK293 Cells
- Humans
- Lectins, C-Type/chemistry
- Lectins, C-Type/genetics
- Mice
- Mice, Inbred C57BL
- Models, Molecular
- Mutagenesis, Site-Directed
- Mutation
- NK Cell Lectin-Like Receptor Subfamily B/chemistry
- NK Cell Lectin-Like Receptor Subfamily B/genetics
- Protein Conformation
- Protein Conformation, alpha-Helical
- Protein Domains
- Receptors, Immunologic/chemistry
- Receptors, Immunologic/genetics
- Receptors, Natural Killer Cell/chemistry
- Receptors, Natural Killer Cell/genetics
- X-Ray Diffraction
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Affiliation(s)
- Gautham R Balaji
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, 3800, Australia
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia
| | - Oscar A Aguilar
- Department of Immunology, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada
- Department of Microbiology and Immunology, University of California, San Francisco, CA, 94143, USA
- Parker Institute for Cancer Immunotherapy, University of California, San Francisco, CA, 94143, USA
| | - Miho Tanaka
- Department of Immunology, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada
| | - Miguel A Shingu-Vazquez
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, 3800, Australia
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia
| | - Zhihui Fu
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, 3800, Australia
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia
| | - Benjamin S Gully
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, 3800, Australia
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia
| | - Lewis L Lanier
- Department of Microbiology and Immunology, University of California, San Francisco, CA, 94143, USA
- Parker Institute for Cancer Immunotherapy, University of California, San Francisco, CA, 94143, USA
| | - James R Carlyle
- Department of Immunology, University of Toronto, Toronto, ON, M5S 1A8, Canada.
- Sunnybrook Research Institute, Toronto, ON, M4N 3M5, Canada.
| | - Jamie Rossjohn
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, 3800, Australia.
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia.
- Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK.
| | - Richard Berry
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, 3800, Australia.
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, 3800, Australia.
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9
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Bláha J, Kalousková B, Skořepa O, Pažický S, Novák P, Vaněk O. High-level expression and purification of soluble form of human natural killer cell receptor NKR-P1 in HEK293S GnTI - cells. Protein Expr Purif 2017; 140:36-43. [PMID: 28757467 DOI: 10.1016/j.pep.2017.07.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 07/21/2017] [Accepted: 07/25/2017] [Indexed: 02/09/2023]
Abstract
Human natural killer receptor protein 1 (NKR-P1, CD161, gene klrb1) is a C-type lectin-like receptor of natural killer (NK) cells responsible for recognition of its cognate protein ligand lectin-like transcript 1 (LLT1). NKR-P1 is the single human orthologue of the prototypical rodent NKR-P1 receptors. Naturally, human NKR-P1 is expressed on the surface of NK cells, where it serves as inhibitory receptor; and on T and NKT cells functioning as co-stimulatory receptor promoting secretion of IFNγ. Most notably, it is expressed on Th17 and Tc17 lymphocytes where presumably promotes targeting into LLT1 expressing immunologically privileged niches. We tested effect of different protein tags (SUMO, TRX, GST, MsyB) on expression of soluble NKR-P1 in E. coli. Then we optimized the expression construct of soluble NKR-P1 by preparing a library of expression constructs in pOPING vector containing the extracellular lectin-like domain with different length of the putative N-terminal stalk region and tested its expression in Sf9 and HEK293 cells. Finally, a high-level expression of soluble NKR-P1 was achieved by stable expression in suspension-adapted HEK293S GnTI- cells utilizing pOPINGTTneo expression vector. Purified soluble NKR-P1 is homogeneous, deglycosylatable, crystallizable and monomeric in solution, as shown by size-exclusion chromatography, multi-angle light scattering and analytical ultracentrifugation.
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Affiliation(s)
- Jan Bláha
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840 Prague, Czech Republic
| | - Barbora Kalousková
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840 Prague, Czech Republic
| | - Ondřej Skořepa
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840 Prague, Czech Republic
| | - Samuel Pažický
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840 Prague, Czech Republic
| | - Petr Novák
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840 Prague, Czech Republic; Institute of Microbiology, The Czech Academy of Sciences, BIOCEV, Průmyslová 595, 25250 Vestec, Czech Republic
| | - Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030/8, 12840 Prague, Czech Republic.
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10
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Rutkowski E, Leibelt S, Born C, Friede ME, Bauer S, Weil S, Koch J, Steinle A. Clr-a: A Novel Immune-Related C-Type Lectin-like Molecule Exclusively Expressed by Mouse Gut Epithelium. THE JOURNAL OF IMMUNOLOGY 2016; 198:916-926. [PMID: 27956531 DOI: 10.4049/jimmunol.1600666] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 11/14/2016] [Indexed: 11/19/2022]
Abstract
The mouse gut epithelium represents a constitutively challenged environment keeping intestinal commensal microbiota at bay and defending against invading enteric pathogens. The complex immunoregulatory network of the epithelial barrier surveillance also involves NK gene complex (NKC)-encoded C-type lectin-like molecules such as NKG2D and Nkrp1 receptors. To our knowledge, in this study, we report the first characterization of the orphan C-type lectin-like molecule Clr-a encoded by the Clec2e gene in the mouse NKC. Screening of a panel of mouse tissues revealed that Clec2e transcripts are restricted to the gastrointestinal tract. Using Clr-a-specific mAb, we characterize Clr-a as a disulfide-linked homodimeric cell surface glycoprotein. Of note, a substantial fraction of Clr-a molecules are retained intracellularly, and analyses of Clr-a/Clr-f hybrids attribute intracellular retention to both the stalk region and parts of the cytoplasmic domain. Combining quantitative PCR analyses with immunofluorescence studies revealed exclusive expression of Clr-a by intestinal epithelial cells and crypt cells throughout the gut. Challenge with polyinosinic-polycytidylic acid results in a rapid and strong downregulation of intestinal Clr-a expression in contrast to the upregulation of Clr-f, a close relative of Clr-a, that also is specifically expressed by the intestinal epithelium and acts as a ligand of the inhibitory Nkrp1g receptor. Collectively, we characterize expression of the mouse NKC-encoded glycoprotein Clr-a as strictly associated with mouse intestinal epithelium. Downregulation upon polyinosinic-polycytidylic acid challenge and expression by crypt cells clearly distinguish Clr-a from the likewise intestinal epithelium-restricted Clr-f, pointing to a nonredundant function of these highly related C-type lectin-like molecules in the context of intestinal immunosurveillance.
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Affiliation(s)
- Emilia Rutkowski
- Institute for Molecular Medicine, Johann Wolfgang Goethe University Frankfurt am Main, 60590 Frankfurt am Main, Germany
| | - Stefan Leibelt
- Institute for Molecular Medicine, Johann Wolfgang Goethe University Frankfurt am Main, 60590 Frankfurt am Main, Germany
| | - Christina Born
- Institute for Molecular Medicine, Johann Wolfgang Goethe University Frankfurt am Main, 60590 Frankfurt am Main, Germany
| | - Miriam E Friede
- Institute for Molecular Medicine, Johann Wolfgang Goethe University Frankfurt am Main, 60590 Frankfurt am Main, Germany
| | - Stefan Bauer
- Institute for Immunology, Philipps University Marburg, 35043 Marburg, Germany
| | - Sandra Weil
- Institute of Medical Microbiology and Hygiene, University of Mainz Medical Center, 55131 Mainz, Germany; and.,Institute for Tumor Biology and Experimental Therapy, Georg-Speyer-Haus, 60596 Frankfurt am Main, Germany
| | - Joachim Koch
- Institute of Medical Microbiology and Hygiene, University of Mainz Medical Center, 55131 Mainz, Germany; and.,Institute for Tumor Biology and Experimental Therapy, Georg-Speyer-Haus, 60596 Frankfurt am Main, Germany
| | - Alexander Steinle
- Institute for Molecular Medicine, Johann Wolfgang Goethe University Frankfurt am Main, 60590 Frankfurt am Main, Germany;
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11
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Rozbeský D, Adámek D, Pospíšilová E, Novák P, Chmelík J. Solution structure of the lymphocyte receptor Nkrp1a reveals a distinct conformation of the long loop region as compared to in the crystal structure. Proteins 2016; 84:1304-11. [PMID: 27238500 DOI: 10.1002/prot.25078] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 05/13/2016] [Accepted: 05/20/2016] [Indexed: 11/08/2022]
Abstract
Mouse Nkrp1a receptor is a C-type lectin-like receptor expressed on the surface of natural killer cells that play an important role against virally infected and tumor cells. The recently solved crystal structure of Nkrp1a raises questions about a long loop region which was uniquely extended from the central region in the crystal. To understand the functional significance of the loop, the solution structure of Nkrp1a using nuclear magnetic resonance (NMR) spectroscopy was determined. A notable difference between the crystal and NMR structure of Nkrp1a appears in the conformation of the long loop region. While the extended loop points away from the central core and mediates formation of a domain swapped dimer in the crystal, the solution structure is monomeric with the loop tightly anchored to the central region. The findings described the first solution structure in the Nkrp1 family and revealed intriguing similarities and differences to the crystal structure. Proteins 2016; 84:1304-1311. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Daniel Rozbeský
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - David Adámek
- Department of Cell Biology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Eliška Pospíšilová
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Petr Novák
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Josef Chmelík
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
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12
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Kita S, Matsubara H, Kasai Y, Tamaoki T, Okabe Y, Fukuhara H, Kamishikiryo J, Krayukhina E, Uchiyama S, Ose T, Kuroki K, Maenaka K. Crystal structure of extracellular domain of human lectin-like transcript 1 (LLT1), the ligand for natural killer receptor-P1A. Eur J Immunol 2015; 45:1605-13. [DOI: 10.1002/eji.201545509] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Revised: 03/01/2015] [Accepted: 03/26/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Shunsuke Kita
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
| | - Haruki Matsubara
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
- Department of Materials Structure Science; Structural Biology Research Center; Photon Factory; Institute of Materials Structure Science; High Energy Accelerator Research Organization (KEK); The Graduate University for Advanced Studies; Tsukuba Ibaraki Japan
| | - Yoshiyuki Kasai
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
| | - Takaharu Tamaoki
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
| | - Yuki Okabe
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
- Research Center for Hepatitis and Immunology; National Center for Global Health and Medicine; 1-7-1 Kohnodai Ichikawa Chiba Japan
| | - Hideo Fukuhara
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
| | - Jun Kamishikiryo
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama Japan
| | - Elena Krayukhina
- Department of Biotechnology; Graduate School of Engineering; Osaka University; Osaka Japan
- U-Medico Corporation; Osaka Japan
| | - Susumu Uchiyama
- Department of Biotechnology; Graduate School of Engineering; Osaka University; Osaka Japan
| | - Toyoyuki Ose
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
| | - Kimiko Kuroki
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
| | - Katsumi Maenaka
- Laboratory of Biomolecular Science; Faculty of Pharmaceutical Sciences; Hokkaido University; Sapporo Japan
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13
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Skálová T, Bláha J, Harlos K, Dušková J, Koval’ T, Stránský J, Hašek J, Vaněk O, Dohnálek J. Four crystal structures of human LLT1, a ligand of human NKR-P1, in varied glycosylation and oligomerization states. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2015; 71:578-91. [PMID: 25760607 PMCID: PMC4356368 DOI: 10.1107/s1399004714027928] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 12/22/2014] [Indexed: 12/03/2022]
Abstract
Human LLT1 is a C-type lectin-like ligand of NKR-P1 (CD161, gene KLRB1), a C-type lectin-like receptor of natural killer cells. Using X-ray diffraction, the first experimental structures of human LLT1 were determined. Four structures of LLT1 under various conditions were determined: monomeric, dimeric deglycosylated after the first N-acetylglucosamine unit in two forms and hexameric with homogeneous GlcNAc2Man5 glycosylation. The dimeric form follows the classical dimerization mode of human CD69. The monomeric form keeps the same fold with the exception of the position of an outer part of the long loop region. The hexamer of glycosylated LLT1 consists of three classical dimers. The hexameric packing may indicate a possible mode of interaction of C-type lectin-like proteins in the glycosylated form.
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Affiliation(s)
- Tereza Skálová
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Praha 4, Czech Republic
| | - Jan Bláha
- Department of Biochemistry, Faculty of Science, Charles University Prague, Hlavova 8, 128 40 Praha, Czech Republic
| | - Karl Harlos
- Division of Structural Biology, The Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Jarmila Dušková
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Praha 4, Czech Republic
| | - Tomáš Koval’
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovského nám. 2, 162 06 Praha 6, Czech Republic
| | - Jan Stránský
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Praha 4, Czech Republic
| | - Jindřich Hašek
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Praha 4, Czech Republic
| | - Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University Prague, Hlavova 8, 128 40 Praha, Czech Republic
| | - Jan Dohnálek
- Institute of Biotechnology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Praha 4, Czech Republic
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovského nám. 2, 162 06 Praha 6, Czech Republic
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14
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Rozbeský D, Ivanova L, Hernychová L, Grobárová V, Novák P, Černý J. Nkrp1 family, from lectins to protein interacting molecules. Molecules 2015; 20:3463-78. [PMID: 25690298 PMCID: PMC6272133 DOI: 10.3390/molecules20023463] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 02/06/2015] [Accepted: 02/11/2015] [Indexed: 11/25/2022] Open
Abstract
The C-type lectin-like receptors include the Nkrp1 protein family that regulates the activity of natural killer (NK) cells. Rat Nkrp1a was reported to bind monosaccharide moieties in a Ca2+-dependent manner in preference order of GalNac > GlcNAc >> Fuc >> Gal > Man. These findings established for rat Nkrp1a have been extrapolated to all additional Nkrp1 receptors and have been supported by numerous studies over the past two decades. However, since 1996 there has been controversy and another article showed lack of interactions with saccharides in 1999. Nevertheless, several high affinity saccharide ligands were synthesized in order to utilize their potential in antitumor therapy. Subsequently, protein ligands were introduced as specific binders for Nkrp1 proteins and three dimensional models of receptor/protein ligand interaction were derived from crystallographic data. Finally, for at least some members of the NK cell C-type lectin-like proteins, the “sweet story” was impaired by two reports in recent years. It has been shown that the rat Nkrp1a and CD69 do not bind saccharide ligands such as GlcNAc, GalNAc, chitotetraose and saccharide derivatives (GlcNAc-PAMAM) do not directly and specifically influence cytotoxic activity of NK cells as it was previously described.
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MESH Headings
- Animals
- Antigens, CD/chemistry
- Antigens, CD/immunology
- Antigens, CD/metabolism
- Antigens, Differentiation, T-Lymphocyte/chemistry
- Antigens, Differentiation, T-Lymphocyte/immunology
- Antigens, Differentiation, T-Lymphocyte/metabolism
- Humans
- Killer Cells, Natural/chemistry
- Killer Cells, Natural/immunology
- Killer Cells, Natural/metabolism
- Lectins, C-Type/chemistry
- Lectins, C-Type/immunology
- Lectins, C-Type/metabolism
- Male
- NK Cell Lectin-Like Receptor Subfamily B/chemistry
- NK Cell Lectin-Like Receptor Subfamily B/immunology
- NK Cell Lectin-Like Receptor Subfamily B/metabolism
- Oligosaccharides/chemistry
- Oligosaccharides/immunology
- Oligosaccharides/metabolism
- Protein Structure, Tertiary
- Rats
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Affiliation(s)
- Daniel Rozbeský
- Institute of Microbiology, v.v.i., Academy of Sciences of the Czech Republic, Vídeňská 1083, Prague 414220, Czech Republic.
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 8, Prague 212843, Czech Republic.
| | - Ljubina Ivanova
- Institute of Microbiology, v.v.i., Academy of Sciences of the Czech Republic, Vídeňská 1083, Prague 414220, Czech Republic.
| | - Lucie Hernychová
- Institute of Microbiology, v.v.i., Academy of Sciences of the Czech Republic, Vídeňská 1083, Prague 414220, Czech Republic.
- Department of Cell Biology, Faculty of Science, Charles University, Viničná 7, Prague 212843, Czech Republic.
| | - Valéria Grobárová
- Department of Cell Biology, Faculty of Science, Charles University, Viničná 7, Prague 212843, Czech Republic.
| | - Petr Novák
- Institute of Microbiology, v.v.i., Academy of Sciences of the Czech Republic, Vídeňská 1083, Prague 414220, Czech Republic.
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 8, Prague 212843, Czech Republic.
| | - Jan Černý
- Department of Cell Biology, Faculty of Science, Charles University, Viničná 7, Prague 212843, Czech Republic.
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15
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Kirkham CL, Carlyle JR. Complexity and Diversity of the NKR-P1:Clr (Klrb1:Clec2) Recognition Systems. Front Immunol 2014; 5:214. [PMID: 24917862 PMCID: PMC4041007 DOI: 10.3389/fimmu.2014.00214] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 04/28/2014] [Indexed: 11/26/2022] Open
Abstract
The NKR-P1 receptors were identified as prototypical natural killer (NK) cell surface antigens and later shown to be conserved from rodents to humans on NK cells and subsets of T cells. C-type lectin-like in nature, they were originally shown to be capable of activating NK cell function and to recognize ligands on tumor cells. However, certain family members have subsequently been shown to be capable of inhibiting NK cell activity, and to recognize proteins encoded by a family of genetically linked C-type lectin-related ligands. Some of these ligands are expressed by normal, healthy cells, and modulated during transformation, infection, and cellular stress, while other ligands are upregulated during the immune response and during pathological circumstances. Here, we discuss historical and recent developments in NKR-P1 biology that demonstrate this NK receptor–ligand system to be far more complex and diverse than originally anticipated.
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Affiliation(s)
- Christina L Kirkham
- Department of Immunology, University of Toronto, Sunnybrook Research Institute , Toronto, ON , Canada
| | - James R Carlyle
- Department of Immunology, University of Toronto, Sunnybrook Research Institute , Toronto, ON , Canada
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16
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Chai L, Wu S, Liu G, Wang Z, Tian W, Ma Y. OCILRP2 signaling synergizes with LPS to induce the maturation and differentiation of murine dendritic cells. Biochem Biophys Res Commun 2014; 446:836-42. [PMID: 24631687 DOI: 10.1016/j.bbrc.2014.02.145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Accepted: 02/25/2014] [Indexed: 11/29/2022]
Abstract
Osteoclast Inhibitory Lectin-related Protein 2 (OCILRP2) is a typical type II transmembrane protein and belongs to C-type lectin-related protein family. It is preferentially expressed in dendritic cells (DC), B lymphocytes, and activated T lymphocytes. Upon binding to its ligand, OCILRP2 can promote CD28-mediated co-stimulation and enhance T cell activation. However, the role of OCILRP2 in DC development and activation is unclear. In this report, we present evidence that recombinant protein OCILRP2-Fc inhibits the generation and LPS-induced maturation of murine bone marrow-derived dendritic cells (BMDCs) by downregulating the expression of CD11c, MHC-II, and co-stimulators CD80 and CD86. OCILRP2-Fc also reduces the capacity of BMDCs to take up antigens, activates T cells, and secret inflammatory cytokines such as IL-6, IL-12, and TNF-α. Additionally, we show that OCILRP2-Fc may cause the aforementioned effects through inhibiting NF-κB activation. Therefore, OCILRP2 is a new regulator of DC maturation and differentiation following TLR4 activation.
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Affiliation(s)
- Lihui Chai
- Department of Microbiology and Immunology, Zhengzhou University School of Medicine, 100 Kexue Road, Zhengzhou 450001, People's Republic of China; Laboratory of Cellular and Molecular Immunology, Henan University School of Medicine, The New Campus, Jinming Road, Kaifeng 475004, People's Republic of China
| | - Suxia Wu
- Laboratory of Cellular and Molecular Immunology, Henan University School of Medicine, The New Campus, Jinming Road, Kaifeng 475004, People's Republic of China
| | - Guangchao Liu
- Laboratory of Cellular and Molecular Immunology, Henan University School of Medicine, The New Campus, Jinming Road, Kaifeng 475004, People's Republic of China
| | - Zhanzheng Wang
- Laboratory of Cellular and Molecular Immunology, Henan University School of Medicine, The New Campus, Jinming Road, Kaifeng 475004, People's Republic of China
| | - Wenzhi Tian
- Laboratory of Cellular and Molecular Immunology, Henan University School of Medicine, The New Campus, Jinming Road, Kaifeng 475004, People's Republic of China.
| | - Yuanfang Ma
- Laboratory of Cellular and Molecular Immunology, Henan University School of Medicine, The New Campus, Jinming Road, Kaifeng 475004, People's Republic of China.
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17
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Bartel Y, Bauer B, Steinle A. Modulation of NK cell function by genetically coupled C-type lectin-like receptor/ligand pairs encoded in the human natural killer gene complex. Front Immunol 2013; 4:362. [PMID: 24223577 PMCID: PMC3819593 DOI: 10.3389/fimmu.2013.00362] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 10/24/2013] [Indexed: 12/28/2022] Open
Abstract
Functional responses of natural killer (NK) cells including eradication of “harmful” cells and modulation of immune responses are regulated by a broad variety of activating and inhibitory NK receptors. Whereas the leukocyte receptor complex (LRC) encodes for NK receptors of the immunoglobulin superfamily, genes of C-type lectin-like NK receptors are clustered in the mammalian natural killer gene complex (NKC). Besides the thoroughly studied C-type lectin-like receptors NKG2D, CD94/NKG2x, and members of the murine Ly49 subfamily, the NKC also encodes for NK receptors of the less characterized NKRP1 subfamily. The prototypic mouse NKRP1 receptor is Nkrp1c (also known as NK1.1), while human members of the NKRP1 subfamily are NKRP1A, NKp80, and NKp65. The latter are not straight homologs of mouse NKRP1 receptors, but share distinct subfamily-specific traits classifying them as members of the NKRP1 subfamily. Ligands of the human NKPR1 receptors are likewise C-type lectin-like glycoproteins belonging to the CLEC2 subfamily (i.e., LLT1, AICL, and KACL), and are encoded in the NKC in tight genetic linkage to their respective receptors. Similarly, certain members of the mouse NKRP1 subfamily interact with genetically coupled CLEC2 glycoproteins, while the reasons for this intriguing tight genetic linkage remain unknown. Recent studies provided new and unique insights into the expression, interaction, and signaling of NKRP1 receptors and their ligands, thereby substantially advancing our understanding of their function and biology. Here, we review our current knowledge on NKRP1 receptors and their genetically linked CLEC2 ligands with an emphasis on the human receptor/ligand pairs NKRP1A-LLT1, NKp80-AICL, and NKp65-KACL.
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Affiliation(s)
- Yvonne Bartel
- Institute for Molecular Medicine, Goethe-University Frankfurt am Main , Frankfurt am Main , Germany
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18
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Grobárová V, Benson V, Rozbeský D, Novák P, Cerný J. Re-evaluation of the involvement of NK cells and C-type lectin-like NK receptors in modulation of immune responses by multivalent GlcNAc-terminated oligosaccharides. Immunol Lett 2013; 156:110-7. [PMID: 24076118 DOI: 10.1016/j.imlet.2013.09.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 09/16/2013] [Accepted: 09/16/2013] [Indexed: 02/04/2023]
Abstract
Recognition of glycosylation patterns is one of the basic features of innate immunity. Ability of C-type lectin-like receptors such as NKR-P1 to bind saccharide moieties has become recently a controversial issue. In the present study, binding assay with soluble fluorescently labeled recombinant rat NKR-P1A and mouse NKR-P1C proteins revealed apparently no affinity to the various neoglycoproteins. Lack of functional linkage between NKR-P1 and previously described saccharide binder was supported by the fact, that synthetic N-acetyl-D-glucosamine octabranched dendrimer on polyamidoamine scaffold (GN8P) did not change gene expression of NKR-P1 isoforms in C57BL/6 and BALB/c mice divergent in the NK gene complex (both in vitro and in vivo). Surprisingly, N-acetyl-D-glucosamine-coated tetrabranched polyamido-amine dendrimer specifically binds to NKT cells and macrophages but not to NK cells (consistently with changes in cytokine patterns). Despite the fact that GN8P has been tested as an immunomodulator in anti-cancer treatment animal models for many years, surprisingly no changes in cytokine profiles in serum relevant to anti-cancer responses using B16F10 and CT26 harboring mouse strains C57BL/6 and BALB/c are observed. Our results indicate possible indirect involvement of NK cells in GN8P mediated immune responses.
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Affiliation(s)
- Valéria Grobárová
- Institute of Microbiology, ASCR v.v.i., Department of Immunology and Gnotobiology, Vídeňská 1083, 142 20 Prague 4, Czech Republic
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19
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Structure of NKp65 bound to its keratinocyte ligand reveals basis for genetically linked recognition in natural killer gene complex. Proc Natl Acad Sci U S A 2013; 110:11505-10. [PMID: 23803857 DOI: 10.1073/pnas.1303300110] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The natural killer (NK) gene complex (NKC) encodes numerous C-type lectin-like receptors that govern the activity of NK cells. Although some of these receptors (Ly49s, NKG2D, CD94/NKG2A) recognize MHC or MHC-like molecules, others (Nkrp1, NKRP1A, NKp80, NKp65) instead bind C-type lectin-like ligands to which they are genetically linked in the NKC. To understand the basis for this recognition, we determined the structure of human NKp65, an activating receptor implicated in the immunosurveillance of skin, bound to its NKC-encoded ligand keratinocyte-associated C-type lectin (KACL). Whereas KACL forms a homodimer resembling other C-type lectin-like dimers, NKp65 is monomeric. The binding mode in the NKp65-KACL complex, in which a monomeric receptor engages a dimeric ligand, is completely distinct from those used by Ly49s, NKG2D, or CD94/NKG2A. The structure explains the exceptionally high affinity of the NKp65-KACL interaction compared with other cell-cell interaction pairs (KD = 6.7 × 10(-10) M), which may compensate for the monomeric nature of NKp65 to achieve cell activation. This previously unreported structure of an NKC-encoded receptor-ligand complex, coupled with mutational analysis of the interface, establishes a docking template that is directly applicable to other genetically linked pairs in the NKC, including Nkrp1-Clr, NKRP1A-LLT1, and NKp80-AICL.
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