We report the discovery of a broadly reactive antibody-binding protein (Protein M) from human mycoplasma. The crystal structure of the ectodomain of transmembrane Protein M differs from other known protein structures, as does its mechanism of antibod ...
We report the discovery of a broadly reactive antibody-binding protein (Protein M) from human mycoplasma. The crystal structure of the ectodomain of transmembrane Protein M differs from other known protein structures, as does its mechanism of antibody binding. Protein M binds with high affinity to all types of human and nonhuman immunoglobulin G, predominantly through attachment to the conserved portions of the variable region of the κ and λ light chains. Protein M blocks antibody-antigen union, likely because of its large C-terminal domain extending over the antibody-combining site, blocking entry to large antigens. Similar to the other immunoglobulin-binding proteins such as Protein A, Protein M as well as its orthologs in other Mycoplasma species could become invaluable reagents in the antibody field.
Organizational Affiliation:
Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.,Synthetic Biology and Bioenergy Group, J Craig Venter Research Institute, Rockville, MD 20850, USA.,Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.,The Center for Physiological Proteomics, The Scripps Research Institute, La Jolla, CA 92037, USA.,Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.,Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037, USA.,Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.,Comprehensive Cancer Center, Mayo Clinic Arizona, Scottsdale, AZ 85259, USA.,Department of Cell and Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.,Department of Internal Medicine, Division of Hematology, and Department of Immunology, Mayo Clinic, College of Medicine, Rochester, MN 55905, USA.,Departments of Pediatrics and Microbiology & Immunology, University of Texas Medical Branch, Galveston, TX 77555, USA.
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