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PK-sensitive PrPSc Is Infectious and Shares Basic Structural Features with PK-resistant PrPSc

机译:PK敏感的PrPSc具有传染性,并且与PK耐药的PrPSc具有基本的结构特征

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摘要

One of the main characteristics of the transmissible isoform of the prion protein (PrPSc) is its partial resistance to proteinase K (PK) digestion. Diagnosis of prion disease typically relies upon immunodetection of PK-digested PrPSc following Western blot or ELISA. More recently, researchers determined that there is a sizeable fraction of PrPSc that is sensitive to PK hydrolysis (sPrPSc). Our group has previously reported a method to isolate this fraction by centrifugation and showed that it has protein misfolding cyclic amplification (PMCA) converting activity. We compared the infectivity of the sPrPSc versus the PK-resistant (rPrPSc) fractions of PrPSc and analyzed the biochemical characteristics of these fractions under conditions of limited proteolysis. Our results show that sPrPSc and rPrPSc fractions have comparable degrees of infectivity and that although they contain different sized multimers, these multimers share similar structural properties. Furthermore, the PK-sensitive fractions of two hamster strains, 263K and Drowsy (Dy), showed strain-dependent differences in the ratios of the sPrPSc to the rPrPSc forms of PrPSc. Although the sPrPSc and rPrPSc fractions have different resistance to PK-digestion, and have previously been shown to sediment differently, and have a different distribution of multimers, they share a common structure and phenotype.
机译:pr病毒蛋白(PrPSc)的可传播同工型的主要特征之一是其对蛋白酶K(PK)消化的部分抗性。病毒疾病的诊断通常依赖于Western blot或ELISA对PK消化的PrPSc的免疫检测。最近,研究人员确定存在大量对PK水解敏感的PrPSc(sPrPSc)。我们的小组以前曾报道过一种通过离心分离该级分的方法,并表明它具有蛋白质错误折叠循环扩增(PMCA)转换活性。我们比较了sPrPSc与PrPSc的PK抗性(rPrPSc)组分的感染性,并在有限的蛋白水解条件下分析了这些组分的生化特性。我们的结果表明,sPrPSc和rPrPSc馏分具有相似的感染程度,尽管它们包含不同大小的多聚体,但这些多聚体具有相似的结构特性。此外,两种仓鼠菌株263K和Drowsy(Dy)的PK敏感性级分显示sPrPSc与rPrPSc形式的PrPSc的比例存在菌株依赖性差异。尽管sPrPSc和rPrPSc馏分对PK消化的抵抗力不同,并且先前已显示出不同的沉淀,并且具有不同的多聚体分布,但它们具有相同的结构和表型。

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