利用FRET技术检测膜受体与胞外配体相互作用的优化策略
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E-mail:yujiesun@njmu.edu.cn

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Q343

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国家自然科学基金项目(82072580)


The optimized strategies for detecting interactions between membrane receptor and extracellular ligand using fluorescence resonance energy transfer(FRET)technology
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    摘要:

    目的:以LRP6膜受体与WNT3A相互作用为模型,针对FRET技术在研究膜受体与胞外配体相互作用中的限制因素,探究有效的改进策略。方法:利用PDB与Zdock数据库建立LRP6与WNT3A的相互作用模型,在不影响LRP6膜受体与 WNT3A相互作用的前提下对LRP6进行一定的截短;将LRP6与WNT3A的信号肽重构在荧光标签的氨基末端,以避免信号肽切除导致的荧光标签丢失;使用柔性连接肽衔接信号肽、荧光标签及成熟蛋白,以削弱荧光标签对膜受体的亚细胞定位及功能的影响。结果:改进策略显著增强LRP6融合蛋白的膜定位信号,LRP6与WNT3A在细胞膜区域的相互作用能够用FRET技术进行清晰检测,平均FRET效率达到26.51%。结论:改进策略有效,为利用FRET技术研究活细胞中膜受体与胞外配体相互作用提供了新的思路和策略。

    Abstract:

    Objective:This stuly aims to explore strategies for effectively studying the interaction between membrane receptors and extracellular ligands using fluorescence resonance energy transfer(FRET). Methods:Based on the model of interaction between LRP6 and WNT3A established by PDB and Zdock database,LRP6 was truncated without affecting the interaction between LRP6 membrane receptor and WNT3A;the signal peptides of LRP6 and WNT3A were reconstituted at the amino terminus of the fluorescent tag to avoid loss of the fluorescent tag due to signal peptide cleavage;flexible linker peptides was used to connect signal peptides,fluorescent tags, and mature proteins to attenuate the effects of fluorescent tags on subcellular localization and function of membrane receptors. Results:The above improvement strategy significantly enhanced the membrane localization signal of LRP6 fusion protein. The interaction between LRP6 and WNT3A in the cell membrane region could be clearly detected by FRET technology,and the average FRET efficiency reached 26.51%. Conclusion:This study provides new ideas and strategies for effectively using FRET technology to study the interaction between membrane receptors and extracellular ligands in living cells.

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马廷政,曹平平,汪徐春,孙玉洁.利用FRET技术检测膜受体与胞外配体相互作用的优化策略[J].南京医科大学学报(自然科学版),2022,42(8):1049-1054

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  • 在线发布日期: 2022-08-07
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