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Serra P, Garabatos N, Singha S, Fandos C, Garnica J, Solé P, Parras D, Yamanouchi J, Blanco J, Tort M, Ortega M, Yang Y, Ellestad KK, Santamaria P. Increased yields and biological potency of knob-into-hole-based soluble MHC class II molecules. Nat Commun 2019; 10:4917. [PMID: 31664029 PMCID: PMC6820532 DOI: 10.1038/s41467-019-12902-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 10/04/2019] [Indexed: 12/19/2022] Open
Abstract
Assembly of soluble peptide-major histocompatibility complex class II (pMHCII) monomers into multimeric structures enables the detection of antigen-specific CD4+ T cells in biological samples and, in some configurations, their reprogramming in vivo. Unfortunately, current MHCII-αβ chain heterodimerization strategies are typically associated with low production yields and require the use of foreign affinity tags for purification, precluding therapeutic applications in humans. Here, we show that fusion of peptide-tethered or empty MHCII-αβ chains to the IgG1-Fc mutated to form knob-into-hole structures results in the assembly of highly stable pMHCII monomers. This design enables the expression and rapid purification of challenging pMHCII types at high yields without the need for leucine zippers and purification affinity tags. Importantly, this design increases the antigen-receptor signaling potency of multimerized derivatives useful for therapeutic applications and facilitates the detection and amplification of low-avidity T cell specificities in biological samples using flow cytometry.
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Affiliation(s)
- Pau Serra
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain.
| | - Nahir Garabatos
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Santiswarup Singha
- Julia McFarlane Diabetes Research Centre (JMDRC) and Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases and Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, T2N 4N1, Canada
| | - César Fandos
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Josep Garnica
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Patricia Solé
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Daniel Parras
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Jun Yamanouchi
- Julia McFarlane Diabetes Research Centre (JMDRC) and Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases and Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, T2N 4N1, Canada
| | - Jesús Blanco
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
- Division of Endocrinology, Hospital Clinic i Provincial de Barcelona, Barcelona, Spain
| | - Meritxell Tort
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Mireia Ortega
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain
| | - Yang Yang
- Julia McFarlane Diabetes Research Centre (JMDRC) and Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases and Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, T2N 4N1, Canada
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Alberta, T2N 4N1, Canada
| | - Kristofor K Ellestad
- Julia McFarlane Diabetes Research Centre (JMDRC) and Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases and Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, T2N 4N1, Canada
| | - Pere Santamaria
- Institut D'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, 08036, Spain.
- Julia McFarlane Diabetes Research Centre (JMDRC) and Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases and Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, T2N 4N1, Canada.
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Rooklin D, Wang C, Katigbak J, Arora PS, Zhang Y. AlphaSpace: Fragment-Centric Topographical Mapping To Target Protein-Protein Interaction Interfaces. J Chem Inf Model 2015. [PMID: 26225450 PMCID: PMC4550072 DOI: 10.1021/acs.jcim.5b00103] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Inhibition
of protein–protein interactions (PPIs) is emerging
as a promising therapeutic strategy despite the difficulty in targeting
such interfaces with drug-like small molecules. PPIs generally feature
large and flat binding surfaces as compared to typical drug targets.
These features pose a challenge for structural characterization of
the surface using geometry-based pocket-detection methods. An attractive
mapping strategy—that builds on the principles of fragment-based
drug discovery (FBDD)—is to detect the fragment-centric modularity
at the protein surface and then characterize the large PPI interface
as a set of localized, fragment-targetable interaction regions. Here,
we introduce AlphaSpace, a computational analysis tool designed for
fragment-centric topographical mapping (FCTM) of PPI interfaces. Our
approach uses the alpha sphere construct, a geometric feature of a
protein’s Voronoi diagram, to map out concave interaction space
at the protein surface. We introduce two new features—alpha-atom
and alpha-space—and the concept of the alpha-atom/alpha-space
pair to rank pockets for fragment-targetability and to facilitate
the evaluation of pocket/fragment complementarity. The resulting high-resolution
interfacial map of targetable pocket space can be used to guide the
rational design and optimization of small molecule or biomimetic PPI
inhibitors.
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Affiliation(s)
- David Rooklin
- Department of Chemistry, New York University , New York, New York 10003, United States
| | - Cheng Wang
- Department of Chemistry, New York University , New York, New York 10003, United States
| | - Joseph Katigbak
- Department of Chemistry, New York University , New York, New York 10003, United States
| | - Paramjit S Arora
- Department of Chemistry, New York University , New York, New York 10003, United States
| | - Yingkai Zhang
- Department of Chemistry, New York University , New York, New York 10003, United States.,NYU-ECNU Center for Computational Chemistry at NYU Shanghai , Shanghai 200062, China
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Wang Z, Ouyang L, Liang Z, Chen J, Yu Q, Jeza VT, Gong Y, Shen G, Weng X, Wu X. CD8(low)CD28(-) T Cells: A Human CD8 T-Suppressor Subpopulation With Alloantigen Specificity Induced by Soluble HLA-A2 Dimer In Vitro. Cell Transplant 2014; 24:2129-42. [PMID: 25199103 DOI: 10.3727/096368914x683575] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
CD8(+) suppressor T cells have been demonstrated to provide protection of allografts from rejection. We previously reported that soluble peptide/HLA-A2 dimer shows peptide-specific inhibitory effects on alloresponse in a coculture of peptide-pulsed T2 cells with HLA-A2 negative lymphocytes in vitro. Here we found a subset of CD8(low)CD28(-) T cells that was induced in the dimer-treated coculture. Importantly, this population showed hyporesponsiveness to the alloantigen restimulation as well as alloantigen-specific suppression on alloreactive T cells in a cell-cell contact-dependent fashion. The suppressive mechanisms of CD8(low)CD28(-) T cells involved an elevated expression of membrane-bound TGF-β1, but not Foxp3, CTLA-4, or IL-10. Furthermore, an overrepresention of CD8(low)CD28(-) T cells was observed in the patients after allogeneic platelet transfusion and positively correlated with the elevated concentrations of plasma HLA class I antigens. Our findings demonstrated that soluble HLA-A2 dimer could efficiently induce the tolerant CD8(low)CD28(-) T cells with alloantigen-specific suppression on alloreactive T cells. This study might provide a new strategy for preparation of donor-specific suppressor T cells and represent an attractive alternative for induction of allograft tolerance.
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Affiliation(s)
- Zhigang Wang
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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