Examining serum amyloid P component microheterogeneity using capillary isoelectric focusing and MALDI-MS.

Examining serum amyloid P component microheterogeneity using capillary isoelectric focusing and MALDI-MS.
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DOI:
10.1002/pmic.201000310
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发表时间:
2011-01
期刊:
影响因子:
3.4
通讯作者:
Hayes, Mark A.
Hayes, Mark A.
中科院分区:
生物学3区
文献类型:
--
作者:
Weiss, Noah G.;Jarvis, Jason W.;Nelson, Randall W.;Hayes, Mark A.

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血清淀粉样蛋白 P 成分 (SAP) 是一种令人感兴趣的糖蛋白,因为它存在于淀粉样斑块形成中。与大多数糖蛋白一样,SAP 的亚型可能存在很大差异,这可能是理解 SAP 作用的一个重要因素。有趣的是,之前的表征表明存在不同程度的微观异质性,其中一些是相互冲突的。在这项工作中,我们提供了新的信息来阐明 SAP 的微观异质性概况,使用毛细管等电聚焦 (cIEF) 仔细分析混合样本,并通过质谱免疫分析研究人群中的单个样本。对于 cIEF,观察到单个 pI 带,表明人类 SAP 不具有从过去的凝胶 IEF 实验得出的广泛异质性。此外,一项人口研究也支持了这一点,该研究揭示了压倒性程度的一致性。总体而言,这项工作证实了 SAP 在整个人群中以及微观异质性方面相对一致的观点。
Serum amyloid P component (SAP) is a glycoprotein of interest due to its presence in amyloid plaque formations. As with most glycoproteins, SAP can possibly vary greatly in its isoforms, which can be an important factor towards understanding the role of SAP. Interestingly, previous characterizations suggest varying degrees of microheterogeneity, some of which are in conflict. In this work, we provide new information to clarify SAP’s microheterogeneity profile using capillary isoelectric focusing (cIEF) to carefully analyze pooled samples and by studying individual samples across populations with mass spectrometric immunoassay. With respect to cIEF, a single pI band was observed suggesting that human SAP does not have extensive heterogeneity concluded from gel IEF experiments in the past. Additionally, this is supported by a population study which revealed an overwhelming degree of uniformity. Overall, this work corroborates the idea that SAP is relatively consistent across the population and with respect to microheterogeneity.
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