与疾病相关的蛋白与等离子体生成物的结合
M B Fischer1, C Roeckl, P Parizek
1Institute for Neuropatholgy, University Hospital of Zurich, Switzerland.
Nature
|December 2, 2000
概括
研究人员在血液中发现了与疾病相关的蛋白 (PrPSc) 结合但不与正常的蛋白 (PrPC) 结合的等离子原体. 这一发现可能有助于诊断传染性海绵状脑病变.
科学领域:
- 神经科学是一个神经科学.
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 传染性海绵状脑病变 (TSEs) 与异常蛋白 (PrPSc) 的积累有关,这是细胞蛋白 (PrPC) 的错误折叠形式.
- PrPSc复制的机制及其与细胞组件的相互作用导致神经病理的机制仍然不完全理解.
- 区分PrPC和PrPSc基于形状已经是一个重大挑战.
研究的目的:
- 为了确定血液中的内源因素,可以区分PrPC和PrPSc.
- 调查这些因素在病病原和潜在的诊断应用中的作用.
主要方法:
- 选人类和小鼠血液,以检测有 PrPSc 但没有 PrPC 的活动.
- 确定负责这种结合活性的特定蛋白质.
- 通过生物化学测定来描述结合相互作用,包括与变质剂和竞争研究的干扰.
主要成果:
- 鉴定了血型蛋白质原,一种血液前蛋白酶,作为一种能结合PrPSc和子传染性的蛋白质,但不是PrPC.
- 证明PrPSc与等离子体的结合是依赖于形状的,被6M尿素或瓜尼丁取消.
- 显示了等离子体的氨酸结合位点1 (圆环I-III) 调解了这种特定的结合,它可以与氨酸竞争.
结论:
- 塑原是第一个被识别的内源性因子,可以选择性地结合病态PrPSc适应器,而不是正常PrPC.
- 等离子体的这种独特的结合特性为开发TSE诊断工具提供了潜在的途径.
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