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3ekc
From Proteopedia
structure of W60V beta-2 microglobulin mutant
Structural highlights
Disease[B2MG_HUMAN] Defects in B2M are the cause of hypercatabolic hypoproteinemia (HYCATHYP) [MIM:241600]. Affected individuals show marked reduction in serum concentrations of immunoglobulin and albumin, probably due to rapid degradation.[1] Note=Beta-2-microglobulin may adopt the fibrillar configuration of amyloid in certain pathologic states. The capacity to assemble into amyloid fibrils is concentration dependent. Persistently high beta(2)-microglobulin serum levels lead to amyloidosis in patients on long-term hemodialysis.[2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] Function[B2MG_HUMAN] Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBeta-2 microglobulin (?2m) is the light chain of class I major histocompatibility complex (MHC-I). Beta2m is an intrinsically amyloidogenic protein that can assemble into amyloid fibrils in a concentration dependent manner. Beta2m is accumulated in serum of haemodialysed patients, and deposited in the skeletal joints, causing dialysis related amyloidosis. Recent reports suggested that the loop comprised between beta2m strands D and E is crucial for protein stability and for beta2m propensity to aggregate as cross-beta structured fibrils. In particular, the role of Trp60 for beta2m stability has been highlighted by showing that the Trp60-->Gly beta2m mutant is more thermo-stable and less prone to aggregation than the wild type protein. On the contrary the Asp59-->Pro beta2m mutant shows lower Tm and stronger tendency to fibril aggregation. To further analyse such properties, the Trp60-->Val beta2m mutant has been expressed and purified; the propensity to fibrillar aggregation and the folding stability have been assessed, and the X-ray crystal structure determined to 1.8A resolution. The W60V mutant structural features are discussed, focusing on the roles of the DE loop and of residue 60 in relation to ?2m structure and its amyloid aggregation trends. Human beta-2 microglobulin W60V mutant structure: Implications for stability and amyloid aggregation.,Ricagno S, Raimondi S, Giorgetti S, Bellotti V, Bolognesi M Biochem Biophys Res Commun. 2009 Mar 13;380(3):543-7. Epub 2009 Jan 25. PMID:19284997[15] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Human | Large Structures | Bellotti, V | Bolognesi, M | Ricagno, S | Sangiovanni, E | Amyloidosis | Beta fibril | Beta-2-microglobulin | Disease mutation | Dra | Glycation | Glycine | Glycoprotein | Immune response | Immune system | Immunoglobulin domain | Mhc i | Pyrrolidone carboxylic acid | Secreted | Tryptophan
