凝集素芯片技术检测糖蛋白方法的建立及初步应用
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国家高技术研究发展计划(863)资助项目(2007AA02Z413).


Establishment of a Lectin Microarray Method for The Rapid Analysis of Glycoprotein and Its Application
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This work is supported by a grant from Hi-Tech Research and Development Program of China (2007AA02Z413).

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    摘要:

    建立了凝集素芯片技术检测糖蛋白的方法,对实验条件进行了优化,应用凝集素芯片初步检测分析了Chang?蒺s liver正常肝细胞总蛋白中的糖蛋白糖链构成.将凝集素ConA、GNA固定于环氧化修饰的玻片表面,用Cy3标记标准糖蛋白RNaseB,利用凝集素识别特异糖链的原理建立凝集素芯片检测糖蛋白的方法.摸索出最佳封闭剂是含1% BSA的磷酸缓冲液,最佳孵育时间及温度为3 h和室温,最佳孵育缓冲液为含1% BSA和0.05% Tween-20的磷酸缓冲液,并用甘露糖抑制实验验证了凝集素芯片结合的特异性.用包含10种凝集素的芯片,成功解析了标准糖蛋白RNaseB、Fetuin的糖链构成,证实了凝集素芯片检测糖蛋白糖链的可行性.最后用凝集素芯片初步检测分析了Chang?蒺s liver正常肝细胞总蛋白中的糖蛋白糖链构成,发现 Chang's liver正常肝细胞总蛋白中的糖蛋白可能有多价 Sia或GlcNAc、terminalα-1,3 mannose、GalNAc、Galβ-1,4GlcNAc这些糖链结构的存在.蛋白质糖基化是一种重要的翻译后修饰,它在微生物感染、细胞分化、肿瘤转移、细胞癌变等生命活动中起着重要作用,因此近年来蛋白质的糖基化研究受到广泛的重视,但由于缺乏一种简便、快速、高通量的检测手段,蛋白质糖基化修饰的研究发展缓慢.凝集素芯片技术的出现实现了对糖蛋白的快速、准确、高通量的检测 分析.

    Abstract:

    The technology of lectin microarrays was established for glycoprotein analysis and initially applied to analyze the glycopattern of whole cell extraction of Chang's liver cells. ConA and GNA were immobilized on the epoxysilane-caoted slides, the standard glycoprotein RNaseB was labeled with Cy3 fluorescent dye, the detection system of lectin microarrays was established for glycoprotein detection and analysis based on the principle of lectin to glycan binding affinity. The consequence of experiment indicated that phosphate buffer containing 1% BSA was the optimal blocking buffer, the optimal incubation time and temperature as well as incubation buffer were 3 hours, room temperature and phosphate buffer containing 1% BSA and 0.05% Tween-20, respectively. Additionally, the specificity of lectin microarrays was validated through the mannose competition assay. Further, the lectin micoarrays containing 10 lectins were fabricated and used to detect and analyze the glycan construction of RNaseB and Fetuin, the result verified the feasibility of our homemade lectin microarray. Eventually they were initially applied to analyze the glycopattern of whole cell extraction of Chang's liver cells. The results indicated that some glycan structure such as multivalent Sia or GlcNAc, terminalα-1,3 mannose, GalNAc and Galβ-1,4GlcNAc possibly existed in the whole cell extraction of Chang's liver cells. Glycosylation is one of the most significant posttranslational modifications of proteins, which plays an indispensable role in a wide variety of biological processes including bacterial infection, cell differentiation, tumor metastasis and cell concretization. Hence, the study on glycosylation draws the attention of researchers widely, but the process develops slowly due to lacking a method can investigate protein-carbohydrate interactions in a rapid, exact and high-throughput manner. The coming lectin microarrays possess the requests above and will promote the process of glycosylation research.

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简强,于汉杰,陈超,李铮.凝集素芯片技术检测糖蛋白方法的建立及初步应用[J].生物化学与生物物理进展,2009,36(2):254-259

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  • 收稿日期:2008-05-26
  • 最后修改日期:2008-07-11
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  • 在线发布日期: 2008-07-14
  • 出版日期: 2009-02-20