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Molecular Basis of Complement C1q Collagen-Like Region Interaction with the Immunoglobulin-Like Receptor LAIR-1.
Fouët, Guillaume; Bally, Isabelle; Chouquet, Anne; Reiser, Jean-Baptiste; Thielens, Nicole M; Gaboriaud, Christine; Rossi, Véronique.
Afiliação
  • Fouët G; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
  • Bally I; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
  • Chouquet A; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
  • Reiser JB; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
  • Thielens NM; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
  • Gaboriaud C; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
  • Rossi V; Institute of Structural Biology (IBS), Univ. Grenoble Alpes, CEA, CNRS, IBS, F-38000 Grenoble, France.
Int J Mol Sci ; 22(10)2021 May 12.
Article em En | MEDLINE | ID: mdl-34066122
The immune system homeostasis relies on a tight equilibrium of interconnected stimulatory and inhibitory signals. Disruption of this balance is characteristic of autoimmune diseases such as systemic lupus erythematosus (SLE). Aside from activating the classical complement pathway and enhancing pathogens and apoptotic cells phagocytosis, C1q has been recently shown to play an important role in immune modulation and tolerance by interacting with several inhibitory and stimulatory immune receptors. Due to its functional organization into collagen-like (CLR) and globular (GR) regions and its multimeric nature, C1q is able to interact simultaneously with several of these receptors and locally congregate pro- and anti-inflammatory signals, thus modulating the immune response. Leukocyte associated immunoglobulin-like (Ig-like) receptor 1 (LAIR-1), a ubiquitous collagen receptor expressed in many immune cell types, has been reported to interact with the CLR of C1q. In this study, we provide new insights into the molecular and structural determinants underlying C1q/LAIR-1 interaction. Recombinant LAIR-1 extracellular Ig-like domain was produced and tested for its interaction with C1q. A molecular dissection of C1q combined with competition assays reveals that LAIR-1 interacts with C1q's CLR through a binding site close but different from the one of its associated C1r2s2 proteases tetramer. On the other side, we identified LAIR-1 residues involved in C1q interaction by site-directed mutational analysis. All together, these results lead to propose a possible model for C1q interaction with LAIR-1 and will contribute to the fundamental understanding of C1q-mediated immune tolerance.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Receptores Imunológicos / Complemento C1q / Colágeno Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Revista: Int J Mol Sci Ano de publicação: 2021 Tipo de documento: Article País de afiliação: França

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Receptores Imunológicos / Complemento C1q / Colágeno Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Revista: Int J Mol Sci Ano de publicação: 2021 Tipo de documento: Article País de afiliação: França