Identification and Characterization of DNA Aptamers Specific for Phosphorylation Epitopes of Tau Protein.

Identification and Characterization of DNA Aptamers Specific for Phosphorylation Epitopes of Tau Protein.
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DOI:
10.1021/jacs.8b08645
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发表时间:
2018-10-31
影响因子:
15
通讯作者:
Tan W
Tan W
中科院分区:
化学1区
文献类型:
--
作者:
Teng IT;Li X;Yadikar HA;Yang Z;Li L;Lyu Y;Pan X;Wang KK;Tan W

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Tau蛋白是稳定微管的蛋白质,但它们的过度磷酸化可导致蛋白质聚集体的形成,并随着时间的推移导致神经变性。这种现象称为tau蛋白病,在病理上涉及几种神经退行性疾病。DNA适体是能够特异性结合靶分子的单链寡核苷酸。使用易于磷酸化的tau表位,我们鉴定了6种不同的适体,其在两个可磷酸化表位(Thr-231和Ser-202)处结合tau,并以纳摩尔亲和力结合全长Tau 441蛋白。此外,这些适体中的几种还抑制tau磷酸化(IT 4、IT 5、IT 6)和tau寡聚化(IT 3、IT 4、IT 5、IT 6)。这是第一份鉴定tau表位特异性适体的报告。此类tau适体可用于检测生物流体中的tau并揭示tau病变的机制。它们可以进一步开发成减轻tau蛋白病相关神经退行性疾病的新型治疗剂。
Tau proteins are proteins that stabilize micro-tubules, but their hyperphosphorylation can result in the formation of protein aggregates and, over time, neuro-degeneration. This phenomenon, termed tauopathy, is pathologically involved in several neurodegenerative disorders. DNA aptamers are single-stranded oligonucleotides capable of specific binding to target molecules. Using tau epitopes predisposed for phosphorylation, we identified six distinct aptamers that bind to tau at two phosphorylatable epitopes (Thr-231 and Ser-202) and to full-length Tau441 proteins with nanomolar affinity. In addition, several of these aptamers also inhibit tau phosphorylation (IT4, IT5, IT6) and tau oligomerization (IT3, IT4, IT5, IT6). This is the first report to identify tau epitope-specific aptamers. Such tau aptamers can be used to detect tau in biofluids and uncover the mechanism of tauopathy. They can be further developed into novel therapeutic agents in mitigating tauopathy-associated neurodegenerative disorders.
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