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- W2313563764 abstract "Myelin basic protein (MBP) is one of the most abundant proteins of the mammalian myelin sheath and plays a structural role in maintaining the stability of myelin. This lipid-rich membrane is essential for proper nerve conduction and the maintenance of neuronal health. MBP is localized on the cytoplasmic side of the membrane. There are 4 isoforms of MBP in the myelin sheath [1]. The mouse MBP transcription unit has been shown to contain 11 exons [2]. The gene contains three different transcription start sites that regulate production of the different MBP-related products [3]. The most downstream transcription start site 3 controls the classic MBP isoforms, with molecular sizes ranging from 14 to 21 kDa. In addition, each protein isoform can exist in the form of several different charge isomers. Alteration of MBP cationicity may represent a regulatory mechanism for normal myelin assembly or a degradative mechanism in demyelinating disorders [4]. MBP shows extensive posttranslational modifications, including deimination of arginine residues. The fractions isolated by cation exchange chromatography on a CM52 column [5] have been named C1, C2, C3, ... , C8. The first big peak to elute is the least cationic isomer, i.e., MBP C8, which is further divided in two subfractions C8a and C8b [6]. It has been shown that fraction C8b contains only MBP, but the main component of fraction C8a has been identified as stathmin [6], which is a microtubule-destabilizing protein; it prevents healing in the demyelinating brain [7]. Deiminated MBP is structurally less ordered and more susceptible to proteolytic attack than the native form. The reduction in cationicity of deiminated MBP impedes membrane assembly and exposes an immunodominant epitope in the membrane-bound protein to proteases [5]. This exposure may then cause the deiminated, highly immunogenic epitope to be released, priming the innate cells of the CNS [4]. In a previous study, we have found that citrullination (i.e., deimination of arginine residues) of myelin basic protein leads to abnormal formation of the myelin membrane [8]. The citrullinated peptide 45-89 released from modified deiminated MBP activates microglial cells and subsequent generation of nitric oxide induces damage of oligodendrocytes, which may be a first step in the initiation of demyelinating disorders [9]." @default.
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- W2313563764 date "2014-09-30" @default.
- W2313563764 modified "2023-09-27" @default.
- W2313563764 title "Different isoforms of deiminated myelin basic protein have different adsorption capacities to the myelin lipids" @default.
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- W2313563764 doi "https://doi.org/10.4024/11sh14a.jbpc.14.03" @default.
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