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Glycan chains modulate prion protein binding to immobilized metal ions.

机译:糖链调节病毒蛋白与固定化金属离子的结合。

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摘要

PrP(c) is the normal isoform of the prion protein which can be converted into PrP(Sc), the pathology-associated conformer in prion diseases. It contains two N-linked glycan chains attached to the C-proximal globular domain. While the biological functions of PrP(c) are still unknown, its ability to bind Cu(2+) is well documented. The main Cu(2+)-binding sites are located in the N-proximal, unstructured region of the molecule. Here we report that PrP(c) glycans influence the capacity of PrP(c) from sheep brain or cultured Rov cells to bind IMAC columns loaded with Cu(2+) or Co(2+). Using different anti-PrP antibodies and PrP(c) glycosylation mutants, we show that the full length non-glycosylated form of PrP(c) has a higher binding efficiency for column-bound Cu(2+) and Co(2+) than the corresponding glycosylated form. Our findings raise the possibility that the accessibility of the PrP(c) metal ion-binding sites might be controlled by the glycan chains.
机译:PrP(c)是pr病毒蛋白的正常同种型,可以转化为PrP(Sc),)病毒疾病中与病理相关的构象异构体。它包含两个连接到C近端球状结构域的N-连接聚糖链。虽然PrP(c)的生物学功能仍是未知的,但其结合Cu(2+)的能力已有充分文献记载。主要的Cu(2+)结合位点位于分子的N近端,非结构化区域。在这里我们报告说,PrP(c)聚糖影响绵羊脑或培养的Rov细胞对PrP(c)的能力,以结合载有Cu(2+)或Co(2+)的IMAC色谱柱。使用不同的抗PrP抗体和PrP(c)糖基化突变体,我们表明PrP(c)的全长非糖基化形式具有比列绑定的Cu(2+)和Co(2+)更高的结合效率相应的糖基化形式。我们的发现增加了PrP(c)金属离子结合位点的可及性可能受聚糖链控制的可能性。

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