中国组织工程研究 ›› 2024, Vol. 28 ›› Issue (17): 2675-2681.doi: 10.12307/2024.445

• 材料生物相容性 material biocompatibility • 上一篇    下一篇

青蛙皮肤活性肽QUB2984的重组表达及体外活性评价

唐子琰1,顾顺强2,陈小玲3,王  蕾3,马成帮3,周  玫3,陈天豹3,杜丽娜1,金义光1   

  1. 1军事科学院军事医学研究院辐射医学研究所,北京市  100850;2武警宁夏总队医院急诊科,宁夏回族自治区银川市  750000;3英国贝尔法斯特女王大学药学院天然药物研究组,英国贝尔法斯特  BT7 1NN
  • 收稿日期:2023-06-05 接受日期:2023-07-20 出版日期:2024-06-18 发布日期:2023-12-15
  • 通讯作者: 杜丽娜,博士,研究员,军事科学院军事医学研究院辐射医学研究所,北京市 100850 金义光,博士,研究员,军事科学院军事医学研究院辐射医学研究所,北京市 100850
  • 作者简介:唐子琰,男,1997年生,河北省保定市人,汉族,博士在读,主要从事天然活性产物及药物递送方面的研究。

Recombinant expression and in vitro activity identification of a bioactive peptide QUB2984 from skin secretion of Agalychnis callidryas

Tang Ziyan1, Gu Shunqiang2, Chen Xiaoling3, Wang Lei3, Ma Chengbang3, Zhou Mei3, Chen Tianbao3, Du Lina1, Jin Yiguang1   

  1. 1Institute of Radiation Medicine, Academy of Military Medicine, Academy of Military Science of Chinese PLA, Beijing 100850, China; 2Department of Emergency, Ningxia Armed Police Corps Hospital, Yinchuan 750000, Ningxia Hui Autonomous Region, China; 3Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT7 1NN, UK
  • Received:2023-06-05 Accepted:2023-07-20 Online:2024-06-18 Published:2023-12-15
  • Contact: Du Lina, PhD, Researcher, Institute of Radiation Medicine, Academy of Military Medicine, Academy of Military Science of Chinese PLA, Beijing 100850, China Jin Yiguang, PhD, Researcher, Institute of Radiation Medicine, Academy of Military Medicine, Academy of Military Science of Chinese PLA, Beijing 100850, China
  • About author:Tang Ziyan, Doctoral candidate, Institute of Radiation Medicine, Academy of Military Medicine, Academy of Military Science of Chinese PLA, Beijing 100850, China

摘要:


文题释义:

重组表达:即重组蛋白表达。在重组蛋白生产过程中,目标蛋白的基因被克隆到载体上,并在模式生物体中表达为蛋白。具体过程为将连接产物转化入大肠杆菌,根据重组载体的标志物作筛选,挑取单斑,碱裂解法小量抽提质粒,双酶切初步鉴定。
活性评价:是指通过实验测定物质的活性水平以及在特定条件下物质的活性变化,来评价物质的性能和特性的评价方法。活性评价是一种客观、科学、可量化的评价方法,可以用来评价物质的功能性、物理性和化学性能。


背景:青蛙活性肽有丰富活性,如抗菌、抗肿瘤,有望解决抗生素耐药性问题。

目的:从红眼树蛙皮肤分泌物中发现活性肽QUB2984,采用生物信息学手段模拟其结构和性质,合成、纯化、鉴定该肽并考察其生物学功能。
方法:采用电刺激得到红眼树蛙皮肤分泌物,分离出mRNA构建cDNA文库,测序得到肽序列。用生物大分子序列搜索工具进行肽序列比对,蛋白质结构模型和功能预测工具开展蛋白二级结构模拟。通过固相合成法合成多肽、反向高效液相进行纯化、基质辅助激光解吸电离飞行时间质谱进行验证。所获得的纯肽用于生物活性评价,采用最小抑菌浓度法评价其抗菌作用,MTT法检测其细胞毒作用,溶血实验考察其安全性。

结果与结论:①所得活性肽QUB2984的结构预测为α-螺旋,有完整的疏水面,对生物膜有一定破坏能力,其序列上第3个氨基酸位置由W组成,并具有G-X-G结构;②活性肽QUB2984对革兰阳性金黄色葡萄球菌的最小抑菌浓度为2 μmol/L,对革兰阴性大肠杆菌的最小抑菌浓度为2 μmol/L,对真菌白色念珠菌的最小抑菌浓度为8 μmol/L;③活性肽QUB2984在10-5  mol/L浓度下对人非小细胞肺癌细胞NCI-H838具有明显抑制作用,在64 μmol/L浓度下对马红细胞的溶血作用为50%;④结果显示,QUB2984具有抗菌抑癌活性,其带+3正电荷,有利于与细菌或细胞接触。

https://orcid.org/0000-0003-4444-4773(唐子琰)

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料口腔生物材料纳米材料缓释材料材料相容性组织工程

关键词: 生物活性肽, 生物合成, 结构模拟, 构效关系, 分离纯化, 抗菌, 抑癌, 溶血评价

Abstract: BACKGROUND: Frog active peptides have rich activities, such as antibacterial and anti-tumor, and are expected to solve the problem of antibiotic resistance.
OBJECTIVE: The active peptide QUB2984 was discovered in the skin secretions of Agalychnis callidryas. Its structure and properties were simulated by bioinformatics. The peptide was synthesized, purified, and identified and its biological functions were investigated.
METHODS: Agalychnis callidryas skin secretions were collected by electrostimulation. The sequence of QUB2984 was obtained through constructing a cDNA library with isolated mRNA. BLAST was used for peptide sequence alignment. Besides that, Iterative Threading ASSEmbly Refinement (I-TASSER) and HeliQuest tools were used for protein secondary structure simulation. It was synthesized by solid-phase peptide synthesis, purified by reverse-phase high-performance liquid chromatography, and structurally confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The purified peptide was used to evaluate its biological activity. Its antibacterial effect was evaluated by the minimum inhibitory concentration method. Its cytotoxic effect was detected by MTT assay. Its safety was investigated by a hemolysis test.
RESULTS AND CONCLUSION: (1) Peptide QUB2984 had basically α-spiral structure, with a relatively intact hydrophobic surface, and a certain destructive ability to biofilm. The third amino acid position of QUB2984 was composed of W and had a G-X-G structure. (2) The minimum inhibitory concentration of QUB2984 against gram-positive Staphylococcus aureus was 2 μmol/L, the minimum inhibitory concentration against gram-negative Escherichia coli was 2 μmol/L, and the minimum inhibitory concentration against the fungus Candida albicans was 8 μmol/L. (3) The active peptide QUB2984 had obvious inhibitory effect on human non-small cell lung cancer cells NCI-H838 at 10-5 mol/L concentration, and the hemolytic effect on horse red cells at 64 μmol/L concentration was 50%. (4) The results showed that QUB2984 had anti-bacterial and anti-cancer activity, and it had a positive charge of +3, which was conducive to contact with bacteria or cells.

Key words: bioactive peptide, biosynthesis, structural simulation, structure-activity relationship, isolation and purification, antibacterial, anticancer, hemolysis evaluation

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