Facile fabrication of branched-chain carbohydrate chips for studying carbohydrate-protein interactions by QCM biosensor

Facile fabrication of branched-chain carbohydrate chips for studying carbohydrate-protein interactions by QCM biosensor
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轻松制造支链碳水化合物芯片,用于通过 QCM 生物传感器研究碳水化合物-蛋白质相互作用

DOI:
10.1016/j.cclet.2017.08.003
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发表时间:
2018
影响因子:
9.1
通讯作者:
Pei Zhichao
Pei Zhichao
中科院分区:
化学1区
文献类型:
--
作者:
Lu Yuchao;Song Siyu;Hou Chenxi;Pang Shuang;Li Xueming;Wu Xiaowen;Shao Chen;Pei Yuxin;Pei Zhichao

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提出了一种利用石英晶体微天平(QCM)生物传感器制作支链碳水化合物芯片以研究碳水化合物与蛋白质相互作用的新方法。这种方法利用功能性炔基支链分子修饰芯片表面,通过末端炔基共价连接未保护的叠氮化合物-碳水化合物。以2-叠氮基-1,3-二甲基咪唑为催化剂,一步合成了无保护叠氮碳水化合物,避免了复杂的化学修饰。此外,碳水化合物修饰的支链表面不仅提供了更特异的结合部位,而且表现出明显的簇合物效应。为了说明糖簇对BC碳水化合物芯片的影响,利用QCM生物传感器对BC半乳糖和甘露糖芯片进行了糖-凝集素相互作用的研究。结果表明,与直链芯片相比,BC芯片显著提高了检测灵敏度。更重要的是,BC半乳糖芯片的灵敏度比SC半乳糖芯片提高了40%。
A novel approach for fabricating branched-chain (BC) carbohydrate chips to study carbohydrate-protein interactions using Quartz Crystal Microbalance (QCM) biosensor was developed. This approach utilizes functional alkynyl-branch molecule modified chip surfaces, which through the terminal alkynyl group for covalent linking of unprotected azide-carbohydrates. The unprotected azide-carbohydrates were syhthesized in one-step using 2-azido-1,3-dimethyl-imidazolinium as catalyst, avoiding complex chemical modifications. Additionally, the branch surface modified with the carbohydrates not only supplies more specific binding site but also reveals significant cluster effect. To exemplify the sugar cluster effect on BC carbohydrate chips, BC Galactose and Mannose chips prepared in this work were used to determine carbohydrate-lectin interactions using QCM biosensor. The results clearly showed that BC chip significantly improves the detection sensitivity compared with the straight-chain (SC) chip. More importantly, the BC galactose chip sensitivity was enhanced 40% compared with the SC galactose chip.
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