Structural basis for binding of human IgG1 to its high-affinity human receptor FcγRI. 2015

Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan.

Cell-surface Fcγ receptors mediate innate and adaptive immune responses. Human Fcγ receptor I (hFcγRI) binds IgGs with high affinity and is the only Fcγ receptor that can effectively capture monomeric IgGs. However, the molecular basis of hFcγRI's interaction with Fc has not been determined, limiting our understanding of this major immune receptor. Here we report the crystal structure of a complex between hFcγRI and human Fc, at 1.80 Å resolution, revealing an unique hydrophobic pocket at the surface of hFcγRI perfectly suited for residue Leu235 of Fc, which explains the high affinity of this complex. Structural, kinetic and thermodynamic data demonstrate that the binding mechanism is governed by a combination of non-covalent interactions, bridging water molecules and the dynamic features of Fc. In addition, the hinge region of hFcγRI-bound Fc adopts a straight conformation, potentially orienting the Fab moiety. These findings will stimulate the development of novel therapeutic strategies involving hFcγRI.

UI MeSH Term Description Entries
D007074 Immunoglobulin G The major immunoglobulin isotype class in normal human serum. There are several isotype subclasses of IgG, for example, IgG1, IgG2A, and IgG2B. Gamma Globulin, 7S,IgG,IgG Antibody,Allerglobuline,IgG(T),IgG1,IgG2,IgG2A,IgG2B,IgG3,IgG4,Immunoglobulin GT,Polyglobin,7S Gamma Globulin,Antibody, IgG,GT, Immunoglobulin
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D011487 Protein Conformation The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain). Conformation, Protein,Conformations, Protein,Protein Conformations
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D017452 Receptors, IgG Specific molecular sites on the surface of various cells, including B-lymphocytes and macrophages, that combine with IMMUNOGLOBULIN Gs. Three subclasses exist: Fc gamma RI (the CD64 antigen, a low affinity receptor), Fc gamma RII (the CD32 antigen, a high affinity receptor), and Fc gamma RIII (the CD16 antigen, a low affinity receptor). Antigens, CD16,Antigens, CD32,Antigens, CD64,CD16 Antigens,CD32 Antigens,CD64 Antigen,CD64 Antigens,Fc Gamma Receptor,Fc Receptors, gamma,Fc gamma Receptors,IgG Receptor,IgG Receptors,Leu-11 Antigen,Receptors, Fc gamma,gamma Fc Receptor,gamma Fc Receptors,CD 16 Antigens,CD 32 Antigens,CD 64 Antigens,CDw32 Antigens,Fc gamma RI,Fc gamma RII,Fc gamma RIII,Immunoglobulin G Receptor,Leu-11 Antigens,Antigen, CD64,Antigen, Leu-11,Antigens, CD 16,Antigens, CD 32,Antigens, CD 64,Antigens, CDw32,Antigens, Leu-11,Fc Receptor, gamma,Gamma Receptor, Fc,Leu 11 Antigen,Leu 11 Antigens,Receptor, Fc Gamma,Receptor, IgG,Receptor, Immunoglobulin G,Receptor, gamma Fc,Receptors, gamma Fc,gamma RI, Fc,gamma RII, Fc,gamma RIII, Fc,gamma Receptors, Fc
D020349 Surface Plasmon Resonance A biosensing technique in which biomolecules capable of binding to specific analytes or ligands are first immobilized on one side of a metallic film. Light is then focused on the opposite side of the film to excite the surface plasmons, that is, the oscillations of free electrons propagating along the film's surface. The refractive index of light reflecting off this surface is measured. When the immobilized biomolecules are bound by their ligands, an alteration in surface plasmons on the opposite side of the film is created which is directly proportional to the change in bound, or adsorbed, mass. Binding is measured by changes in the refractive index. The technique is used to study biomolecular interactions, such as antigen-antibody binding. Plasmon Resonance, Surface,Plasmon Resonances, Surface,Resonance, Surface Plasmon,Resonances, Surface Plasmon,Surface Plasmon Resonances

Related Publications

Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
June 1987, The Journal of biological chemistry,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
April 1995, Molecular immunology,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
August 2010, Proceedings of the National Academy of Sciences of the United States of America,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
April 2013, Nucleic acids research,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
January 2008, Biopolymers,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
November 2015, Immunological reviews,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
November 1988, The Journal of biological chemistry,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
February 2002, Journal of medicinal chemistry,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
November 2015, Acta crystallographica. Section D, Biological crystallography,
Masato Kiyoshi, and Jose M M Caaveiro, and Takeaki Kawai, and Shinya Tashiro, and Teruhiko Ide, and Yoshiharu Asaoka, and Kouta Hatayama, and Kouhei Tsumoto
November 2015, Immunological reviews,
Copied contents to your clipboard!