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首页> 外文期刊>The FEBS journal >Mutational and genetic determinants of lambda 6 light chain amyloidogenesis
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Mutational and genetic determinants of lambda 6 light chain amyloidogenesis

机译:Lambda 6轻链淀粉样蛋白生成的突变和遗传决定因素。

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摘要

Approximately 25% of the 6 light chains have glycine rather than arginine at position 25, which is an allelic variant of the IGLV6-57 (6a) locus. The Gly25 variant has been shown to decrease the folding stability of the germline 6 V-L protein 6aJL2 by 1.7kcalmol(-1). In this work, we compared the thermodynamic and fibrillogenic properties of the amyloidosis (AL) derived recombinant (r) V-L protein AR, which contains the allelic variant Gly25, with those of germline rV(L) 6aJL2-R25G and the 6 disease-associated V-L proteins Wil (AL) and Jto (myeloma). Our experiments show that of the four proteins AR is the least stable; forms amyloid fibrils at physiological temperature, pH and ionic strength; has the shortest lag time; and elongates homologous seeds most efficiently. We conclude that the Gly25 allelic variant, together with the somatic mutations, contributes importantly to the extremely low stability and high amyloidogenicity of the AL-derived protein AR.
机译:6条轻链中大约25%在25位具有甘氨酸而不是精氨酸,这是IGLV6-57(6a)基因座的等位基因变体。 Gly25变体已显示出将种系6 V-L蛋白6aJL2的折叠稳定性降低1.7kcal mol(-1)。在这项工作中,我们比较了淀粉样变性(AL)衍生的重组(r)VL蛋白AR(包含等位基因变体Gly25)与种系rV(L)6aJL2-R25G以及与6种疾病相关的那些的热力学和原纤维形成特性VL蛋白Wil(AL)和Jto(骨髓瘤)。我们的实验表明,在四种蛋白质中,AR的稳定性最差。在生理温度,pH和离子强度下形成淀粉样原纤维;滞后时间最短;并最有效地延长同源种子。我们得出的结论是,Gly25等位基因变异体以及体细胞突变,对AL衍生蛋白AR的极低稳定性和极高的淀粉样变性具有重要作用。

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