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Shams H, Hollenbach JA, Matsunaga A, Mofrad MRK, Oksenberg JR, Didonna A. A short HLA-DRA isoform binds the HLA-DR2 heterodimer on the outer domain of the peptide-binding site. Arch Biochem Biophys 2022; 719:109156. [PMID: 35218721 PMCID: PMC9007275 DOI: 10.1016/j.abb.2022.109156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/06/2022] [Accepted: 02/22/2022] [Indexed: 11/30/2022]
Abstract
The human leukocyte antigen (HLA) locus encodes a large group of proteins governing adaptive and innate immune responses. Among them, HLA class II proteins form α/β heterodimers on the membrane of professional antigen-presenting cells (APCs), where they display both, self and pathogen-derived exogenous antigens to CD4+ T lymphocytes. We have previously shown that a shorter HLA-DRA isoform (sHLA-DRA) lacking 25 amino acids can be presented onto the cell membrane via binding to canonical HLA-DR2 heterodimers. Here, we employed atomistic molecular dynamics simulations to decipher the binding position of sHLA-DRA and its structural impact on functional regions of the HLA-DR2 molecule. We show that a loop region exposed only in the short isoform (residues R69 to G83) is responsible for binding HLA-DR2 on the outer domain of the peptide-binding site, and experimentally validated the critical role of F76 in mediating such interaction. Additionally, sHLA-DRA allosterically modifies the peptide-binding pocket conformation. In summary, this study unravels key molecular mechanisms underlying sHLA-DRA function, providing important insights into the role of full-length proteins in structural modulation of HLA class II receptors.
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Affiliation(s)
- Hengameh Shams
- Weill Institute for Neurosciences, Department of Neurology, University of California, San Francisco, CA, 94158, USA
| | - Jill A Hollenbach
- Weill Institute for Neurosciences, Department of Neurology, University of California, San Francisco, CA, 94158, USA; Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, 94158, USA
| | - Atsuko Matsunaga
- Weill Institute for Neurosciences, Department of Neurology, University of California, San Francisco, CA, 94158, USA
| | - Mohammad R K Mofrad
- Departments of Bioengineering and Mechanical Engineering, University of California, Berkeley, CA, 94720, USA
| | - Jorge R Oksenberg
- Weill Institute for Neurosciences, Department of Neurology, University of California, San Francisco, CA, 94158, USA
| | - Alessandro Didonna
- Weill Institute for Neurosciences, Department of Neurology, University of California, San Francisco, CA, 94158, USA; Department of Anatomy and Cell Biology, East Carolina University, Greenville, NC, 27834, USA.
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Maingot M, Blayo AL, Denoyelle S, M'Kadmi C, Damian M, Mary S, Gagne D, Sanchez P, Aicher B, Schmidt P, Müller G, Teifel M, Günther E, Marie J, Banères JL, Martinez J, Fehrentz JA. New ligands of the ghrelin receptor based on the 1,2,4-triazole scaffold by introduction of a second chiral center. Bioorg Med Chem Lett 2016; 26:2408-2412. [PMID: 27072910 DOI: 10.1016/j.bmcl.2016.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 04/01/2016] [Accepted: 04/03/2016] [Indexed: 12/25/2022]
Abstract
Introducing a second chiral center on our previously described 1,2,4-triazole, allowed us to increase diversity and elongate the 'C-terminal part' of the molecule. Therefore, we were able to explore mimics of the substance P analogs described as inverse agonists. Some compounds presented affinities in the nanomolar range and potent biological activities, while one exhibited a partial inverse agonist behavior similar to a Substance P analog.
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Affiliation(s)
- Mathieu Maingot
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Anne-Laure Blayo
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Séverine Denoyelle
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Céline M'Kadmi
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Marjorie Damian
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Sophie Mary
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Didier Gagne
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Pierre Sanchez
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Babette Aicher
- Æterna Zentaris GmbH, Weismuellerstrasse 50, 60314 Frankfurt am Main, Germany
| | - Peter Schmidt
- Æterna Zentaris GmbH, Weismuellerstrasse 50, 60314 Frankfurt am Main, Germany
| | - Gilbert Müller
- Æterna Zentaris GmbH, Weismuellerstrasse 50, 60314 Frankfurt am Main, Germany
| | - Michael Teifel
- Æterna Zentaris GmbH, Weismuellerstrasse 50, 60314 Frankfurt am Main, Germany
| | - Eckhard Günther
- Æterna Zentaris GmbH, Weismuellerstrasse 50, 60314 Frankfurt am Main, Germany
| | - Jacky Marie
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Jean-Louis Banères
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Jean Martinez
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France
| | - Jean-Alain Fehrentz
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247, CNRS, ENSCM, Université de Montpellier, BP 14491, Faculté de Pharmacie, bât. E, 3(ème) étage, 15 avenue Charles Flahault, 34093 Montpellier Cedex 5, France.
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Seo D, Lee J, Kim SW, Kim I, Na J, Hong MH, Choi HJ. Structural modulation of silicon nanowires by combining a high gas flow rate with metal catalysts. Nanoscale Res Lett 2015; 10:190. [PMID: 26034411 PMCID: PMC4447726 DOI: 10.1186/s11671-015-0893-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Accepted: 04/07/2015] [Indexed: 06/04/2023]
Abstract
UNLABELLED We grew silicon nanowires (SiNWs) by a vapor-liquid-solid (VLS) mechanism using metal catalysts of gold (Au), titanium (Ti), manganese (Mn), and iron (Fe) under a high flow rate of hydrogen (H2). This combination of catalyst types and high gas flow rate revealed the potential for growing various SiNWs, including kinked SiNWs (with Au), ultra-thin SiNWs having diameters about 5 nm (with Ti), rough-surfaced SiNWs (with Mn), and ribbon-shaped SiNWs tens of microns in width (with Fe). The high flow rate of gas affects the VLS mechanism differently for each combination; for example, it induces an unstable solid-liquid interfaces (with Au), active etching of the catalyst (with Ti), sidewall deposition by a vapor-solid (VS) mechanism, and an asymmetric precipitation of Si in the catalyst (with Fe). Our combinatorial approach may provide a new path for the structural modulation of SiNWs via the VLS mechanism. PACS 80; 81; 82.
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Affiliation(s)
- Dongjea Seo
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
| | - Jaejun Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
| | - Sung Wook Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
| | - Ilsoo Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
| | - Jukwan Na
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
| | - Min-Ho Hong
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
| | - Heon-Jin Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea
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