吉林大学学报(医学版) ›› 2022, Vol. 48 ›› Issue (6): 1455-1461.doi: 10.13481/j.1671-587X.20220611

• 基础研究 • 上一篇    下一篇

肿瘤归巢肽-近红外荧光蛋白融合蛋白的制备及其荧光特性

杨馥旭1,胡楠楠1,郭冲1,穆业腾1,薛晗1,范宇鑫1,郭峰霖1,关新刚1,2()   

  1. 1.北华大学医学技术学院医药生物工程重点实验室,吉林 吉林 132013
    2.台州学院医学院基础 医学系,浙江 台州 318000
  • 收稿日期:2022-02-11 出版日期:2022-11-28 发布日期:2022-12-07
  • 通讯作者: 关新刚 E-mail:guanxg@ciac.ac.cn
  • 作者简介:杨馥旭(1998-),女,吉林省辽源市人,在读硕士研究生,主要从事肿瘤靶向治疗方面的研究。
  • 基金资助:
    吉林省科技厅科技发展计划自然科学基金项目(20180101213JC);吉林省卫健委卫生与健康技术创新项目(2020J023);北华大学研究生创新计划项目(北华研创合字〔2021〕029);台州学院高层次人才科研启动项目(T20220101026)

Preparation of tumor homing peptides-near-infrared fluorescent protein miRFP670-LyP1 fusion protein and its fluorescence characteristics

Fuxu YANG1,Nannan HU1,Chong GUO1,Yeteng MU1,Han XUE1,Yuxin FAN1,Fenglin GUO1,Xingang GUAN1,2()   

  1. 1.Key Laboratory of Pharmaceutics and Bioengineering,School of Medical Technology,Beihua University,Jilin 132013,China
    2.Department of Basic Medicine,College of Medical Sciences,Taizhou University,Taizhou 318000,China
  • Received:2022-02-11 Online:2022-11-28 Published:2022-12-07
  • Contact: Xingang GUAN E-mail:guanxg@ciac.ac.cn

摘要:

目的 构建肿瘤归巢肽(THPs)-近红外荧光蛋白(NIRFP)miRFP670- LyP1融合蛋白的原核表达载体,纯化融合蛋白,研究融合蛋白的近红外荧光特性。 方法 采用限制性核酸内切酶EcoRⅠ和Not Ⅰ对pmiRFP670-N1质粒和pET-28a质粒进行双酶切,构建pET-miRFP670原核表达载体,通过点突变引入LyP-1的DNA序列,构建重组表达载体pET-miRFP670-LyP1;将测序正确的重组表达载体转化至大肠杆菌BL21细胞中,SDS-PAGE电泳法检测不同温度(16 ℃和37 ℃)、不同异丙基硫代半乳糖苷浓度(0.1、0.5和1.0 mmol·L-1)诱导下融合蛋白原核表达量;采用Ni-NTA树脂亲和纯化融合蛋白,检测miRFP670-LyP1蛋白原核表达量;采用荧光显微镜观察乳腺癌4T1细胞中miRFP670-LyP1融合蛋白的细胞内吞形态表现。 结果 检测到长度约为5 343和973 bp的DNA条带,与pET-28a载体及miRFP670基因片段大小相符。DNA测序,LyP1序列成功插入至pET-miRFP670表达载体中。在16 ℃时miRFP670-LyP1融合蛋白的可溶性蛋白表达量较37 ℃时更高。采用Ni-NTA树脂纯化得到了高纯度的miRFP670-LyP1融合蛋白。荧光成像,miRFP670-LyP1融合蛋白可被乳腺癌4T1细胞高效内吞。 结论 成功构建了pET-miRFP670-LyP1原核表达载体,融合蛋白在低温(16 ℃)较常温(37 ℃)诱导的可溶性蛋白表达量更高,亲和层析得到了高纯度的融合蛋白,融合蛋白被乳腺癌4T1细胞高效内吞并显示出近红外荧光。

关键词: 近红外荧光蛋白, 肿瘤归巢肽, 融合蛋白, 原核表达, 细胞内吞

Abstract:

Methods The pmiRFP670-N1 plasmid and pET-28a plasmid were doubly digested with restriction endonucleases EcoR Ⅰ and Not Ⅰ to construct the pET-miRFP670 prokaryotic expression vector. The LyP-1 DNA sequence was introduced through point mutation to construct the recombinant expression vector pET-miRFP670-LyP1; the recombinant expression vector with correct sequence was transformed into the E.coli BL21 cells and the prokaryotic expression amounts of fusion proteins induced under different temperatures (16 ℃ and 37 ℃) and different concentrations of isopropyl-β-D-thiogalactopyranoside (IPTG)(0.1,0.5,and 1.0 mmol·L-1) were detected by SDS-PAG electrophoresis; the fusion protein was purified by Ni-NTA resin affinity, and the prokaryotic expression amount of the miRFP670-LyP1 protein was detected; the endocytosis morphology of the miRFP670-LyP1 fusion protein in breast cancer 4T1 cells was observed under fluorescence microscope. Results The double digestion of recombinant plasmid showed that two DNA bands of about 5 343 and 973 bp were obtained, which was consistent with the sizes of the pET-28a vector and miRFP670 gene fragment. The DNA sequencing results showed that the LyP1 sequence was successfully inserted into the pET-miRFP670 expression vector. The soluble protein expression amount of miRFP670-LyP1 fusion protein was higher at 16 ℃ than that at 37 ℃. The miRFP670-LyP1 fusion protein with high purity was obtained by purification with Ni-NTA resin. The fluorescence imaging results showed that the miRFP670-LyP1 fusion protein could be efficiently endocytosed by the breast cancer 4T1 cells. Conclusion The prokaryotic expression vector pET-miRFP670-LyP1 is successfully constructed,the soluble protein expression amount of the fusion protein is higher at low temperature (16 ℃) than that at normal temperature (37 ℃), and the fusion protein with high purity is obtained by affinity chromatography,and the fusion protein is efficiently endocytosed by the breast cancer 4T1 cells and displays near-infrared fluorescence. Objective To construct the prokaryotic expression vector of tumor homing peptide(THPs)-near-infrared fluorescent protein(NIRFP)-miRFP670 LyP1 fusion protein, and to purified fusion protein, and to investigate the near infrared fluorescence characteristics of the fusion protein.

Key words: Near-infrared fluorescent protein, Tumor homing peptide, Fusion protein, Prokaryotic expression, Endocytosis

中图分类号: 

  • R394.3