{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe complement initiator C1q is a multimeric protein assembled from 18 polypeptide chains—six each of A, B, and C—that together form a bouquet‐like structure. In this complex, the C1QB subunit contributes critically to the globular recognition domains that bind a wide variety of ligands. Structural and biochemical studies have demonstrated that the globular domains of C1q, including contributions from the C1QB chain, mediate interactions with immunoglobulins, pentraxins (such as PTX3), and other ligands that trigger the classical pathway of complement activation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, specific charged amino acid residues within the globular head—particularly within the C1QB module—are essential for mediating ligand binding. For example, site‐directed mutagenesis studies have pinpointed residues in the C1QB domain as pivotal for the binding of aggregated IgG and other ligands, which in turn facilitates the recruitment and activation of the associated proteases. Moreover, bacterial surface proteins and anticomplementary agents have been shown to interact with these domains, thereby modulating complement activation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic studies have underscored the importance of the C1QB subunit in immune regulation. Mutations and polymorphisms within the C1QB gene have been linked to altered serum levels of C1q and are associated with autoimmune conditions such as systemic lupus erythematosus and rheumatoid arthritis. In particular, missense mutations in C1QB result in complete deficiency of functional C1q and predispose individuals to severe autoimmune phenotypes, while common single nucleotide polymorphisms appear to modulate disease risk and complement function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in complement activation, emerging evidence indicates that C1q—and by extension the C1QB subunit—is involved in diverse pathological settings. Enhanced deposition or altered expression of C1q has been associated with a range of conditions, including inflammatory renal diseases (such as IgA nephropathy), rejection in kidney transplants, neuropathic pain, certain neuropsychiatric disorders, and even cutaneous melanoma. These studies suggest that C1QB may function not only as a key mediator of innate immunity but also serve as a prognostic biomarker in varied clinical contexts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn summary, the C1QB subunit is integral to the structural integrity and functional versatility of the C1q complex. Its contribution to ligand recognition is essential for initiating classical complement activation, and its specific molecular determinants modulate interactions with immunoglobulins and other ligands. Genetic alterations in C1QB not only impair complement function but also influence susceptibility to autoimmune and inflammatory disorders, underscoring its potential as both a therapeutic target and a biomarker for disease. These multifaceted roles highlight the central importance of C1QB in linking innate immune responses with clinical outcomes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Alma J Nauta, Barbara Bottazzi, Alberto Mantovani, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "The crystal structure of the globular head of complement protein C1q provides a basis for its versatile recognition properties."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M307764200"}], "href": "https://doi.org/10.1074/jbc.M307764200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12960167"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12960167"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Lubka T Roumenina, Marieta M Ruseva, Alexandra Zlatarova, et al. 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