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A1BG
A1BG Full Name
alpha-1-B glycoprotein
A1BG Introduction
Alpha-1-B glycoprotein (A1BG) is an abundant, 54.3 kDa plasma protein that belongs to the immunoglobulin supergene family. Structurally, the human A1BG protein consists of a single polypeptide chain comprising 495 amino acids, which naturally folds into five distinct, repeating immunoglobulin-like V-type domains. These structural domains exhibit significant sequence homology to the variable regions of specific immunoglobulins, suggesting an evolutionary divergence from early immune-regulatory proteins.
Figure 1. Schematic representation of A1BG. (Source: El Atab O, et al. 2024)
While the fundamental physiological purpose of A1BG remained largely elusive for decades following its discovery, recent advances in structural biology and proteomics have finally begun to unravel its biological significance. The primary known function of A1BG is to act as a specific, high-affinity ligand for cysteine-rich secretory protein 3 (CRISP-3). By forming a highly stable, non-covalent 1:1 complex, A1BG effectively sequesters CRISP-3 in human plasma. Because CRISP-3 is heavily involved in innate immunity, exocrine secretions, and neutrophil degranulation, it is widely hypothesized that A1BG serves a critical protective role, shielding the systemic circulation and delicate tissues from the potentially damaging effects of unregulated, free CRISP-3.
In clinical diagnostics, the structural stability and widespread circulatory presence of A1BG have made it a focal point of intense biomarker research, particularly in the fields of oncology and nephrology. Through comprehensive mass spectrometry and proteomic profiling, A1BG is frequently upregulated in a variety of aggressive malignancies, including early-stage non-small cell lung cancer, hepatocellular carcinoma, and pancreatic ductal adenocarcinoma. Beyond its applications in oncology, A1BG exhibits specific disease-related fragmentation patterns that serve as highly specific, non-invasive biomarkers for renal dysfunction. Most notably, the presence of a specific 13.8 kDa truncated fragment of A1BG in urine samples provides exceptional discriminatory power for diagnosing steroid-resistant nephrotic syndrome in pediatric populations. As targeted mass spectrometry continues to improve, the clinical utility of A1BG continues to expand rapidly.
Alternate Names for A1BG
A1BG; alpha-1-B glycoprotein; alpha-1B-glycoprotein; A1B; ABG; GAB; HYST2477; DKFZp686F0970;
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