高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (6): 20220758.doi: 10.7503/cjcu20220758

• 分析化学 • 上一篇    下一篇

肽适体修饰纳米孔道对L⁃精氨酸的灵敏检测

曹忠1, 郭佩弦1, 薛书蕾1, 肖忠良1, 谭淑琪1, 亢璇1, 冯泽猛2, 印遇龙2, 马天骥1()   

  1. 1.长沙理工大学化学化工学院, 电力与交通材料保护湖南省重点实验室, 细胞化学湖南省重点实验室, 长沙 410114
    2.中国科学院亚热带农业生态研究所, 长沙 410125
  • 收稿日期:2022-12-13 出版日期:2023-06-10 发布日期:2023-02-14
  • 通讯作者: 马天骥 E-mail:mtjbj2008@163.com
  • 基金资助:
    国家自然科学基金(22204007);湖南省教育厅科学研究项目(21A0182)

Sensitive Detection of L⁃Arginine Using Peptide Aptamer Functionalized Nanochannel

CAO Zhong1, GUO Peixian1, XUE Shulei1, XIAO Zhongliang1, TAN Shuqi1, KANG Xuan1, FENG Zemeng2, YIN Yulong2, MA Tianji1()   

  1. 1.Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation,Hunan Provincial Key Laboratory of Cytochemistry,School of Chemistry and Chemical Engineering,Changsha University of Science and Technology,Changsha 410114,China
    2.Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China
  • Received:2022-12-13 Online:2023-06-10 Published:2023-02-14
  • Contact: MA Tianji E-mail:mtjbj2008@163.com
  • Supported by:
    the National Natural Science Foundation of China(22204007);the Scientific Research Fund of Hunan Provincial Education Department, China(21A0182)

摘要:

氨基酸是生命之源, 其中L⁃精氨酸(L⁃Arg)是生物体进行新陈代谢的一种重要氨基酸, 同时也是重要的肿瘤标志物之一. 因此, 开发高选择性的L⁃Arg检测方法在生物分析领域十分重要. 本文在Uniprot数据库29185个蛋白质序列中筛选出特异性结合L⁃Arg的多肽序列(序列为 CFGHIHEGY), 经ITC验证后, 将其作为识别元件固定在子弹形纳米孔道尖端表面. 在纳米空间限域效应下, 利用多肽与L⁃Arg特异性结合前后构象由伸展状态向蜷缩状态的变化, 调控纳米孔道离子输运特性变化, 从而实现对L⁃Arg的选择性检测. 实验结果表明, 多肽修饰纳米孔道对L⁃Arg具有高灵敏度和高选择性, 线性范围为1~100 nmol/L, 检出限低至1 nmol/L. 该研究为氨基酸高选择性、 高灵敏检测提供了新方法, 同时也为多肽修饰仿生离子通道的构建提供了新思路.

关键词: 纳米孔道, 离子通道, 纳米空间限域效应, 多肽, L?精氨酸检测

Abstract:

Amino acids are the source of life, in which L⁃arginine(L⁃Arg) is not only an important amino acid for metabolism in organisms, but also one of the important tumor markers. It is very important to develop highly selective methods for the detection of L⁃Arg in the field of bioanalysis. The polypeptide sequence specifically binding to L⁃Arg (sequence CFGHIHEGY) was screened from 29185 protein sequences in Uniprot database and was immobilized on the tip surface of bullet shaped nanochannel as a recognition element. Under the nanoconfined effect, the conformational change from extended state to curled state before and after the specific binding of peptides to L⁃Arg was used to control the effective pore size of nanochannel, resulting in the change of nanopore conductivity, which realize the selective detection of L⁃Arg. The experimental results show that the polypeptide modified nanochannel has high sensitivity and selectivity for L⁃Arg, the linear range is 1—100 nmol/L, and the limit of detection is as low as 1 nmol/L. This research provides a new method for sensible and highly selective amino acid sensing and also provides a new idea for designing peptide functionalized bio-inspired ionic channel.

Key words: Nanopore, Ionic channel, Nanoconfined effect, Peptide aptamer, Detection of L?arginine

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