Effect of methionine oxidation on the structural properties, conformational stability, and aggregation of immunoglobulin light chain LEN.

Effect of methionine oxidation on the structural properties, conformational stability, and aggregation of immunoglobulin light chain LEN.
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蛋氨酸氧化对结构特性,构象稳定性和免疫球蛋白轻链LEN的聚集的影响。

DOI:
10.1021/bi800806d
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发表时间:
2008-08-19
期刊:
影响因子:
2.9
通讯作者:
Uversky, Vladimir N.
Uversky, Vladimir N.
中科院分区:
生物学3区
文献类型:
--
作者:
Hu, Dongmei;Qin, Zhijie;Xue, Bin;Fink, Anthony L.;Uversky, Vladimir N.

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轻链淀粉样变性是由免疫球蛋白轻链在各种器官中的过度产生和异常沉积引起的。LEN是最初从患有多发性骨髓瘤的患者的尿液中分离的免疫球蛋白轻链的可变结构域,没有肾功能障碍或淀粉样变性的迹象。LEN显示在温和的去稳定条件下在体外形成原纤维。在这项工作中,我们研究了甲硫氨酸氧化诱导的免疫球蛋白轻链结构域LEN的结构特性,构象稳定性和聚集行为的变化。我们确定LEN在其天然状态下受到良好的氧化保护,但在4M GuHCl存在下实现了成功的氧化。氧化诱导LEN的结构发生明显变化,并使该蛋白质不稳定。甲硫氨酸氧化的LEN优选形成无定形聚集体而不是原纤维。结果表明,LEN氧化可能在蛋白质的无定形沉积中起重要作用,但在其原纤化中不起作用。
Light chain amyloidoses arise from the overproduction and abnormal deposition of immunoglobulin light chain in various organs. LEN is the variable domain of an immunoglobulin light chain originally isolated from the urine of a patient suffering from multiple myeloma, with no sign of renal dysfunction or amyloidosis. LEN was shown to form fibrils in vitro under mildly destabilizing conditions. In this work we investigated the changes induced by methionine oxidation in structural properties, conformational stability, and aggregation behavior of the immunoglobulin light chain domain LEN. We established that LEN was well-protected from the oxidation in its native state, but successful oxidation was achieved in the presence of 4M GuHCl. Oxidation induced noticeable structural changes in LEN and destabilized this protein. The methionine-oxidized LEN preferred to form amorphous aggregates instead of fibrils. The results indicated that the LEN oxidation may play an important role in amorphous deposition of the protein, but not in its fibrillation.
DOI: 10.1021/bi061716v
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期刊: BIOCHEMISTRY
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作者:
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