食品科学 ›› 2025, Vol. 46 ›› Issue (17): 111-108.doi: 10.7506/spkx1002-6630-20250311-087

• 生物工程 • 上一篇    

毕赤酵母高效合成甜味蛋白Brazzein

高鹏,张胜梦,孙元伟,黄巍巍,邱益彬,徐虹,张琦,李莎   

  1. (1.南京工业大学?材料化学工程全国重点实验室,江苏?南京 211800;2.南京工业大学食品与轻工学院,江苏?南京 211800)
  • 发布日期:2025-08-18
  • 基金资助:
    “十四五”国家重点研发计划重点专项(2023YFF1103400)

Efficient Synthesis of Sweet Protein Brazzein by Komagataella phaffii

GAO Peng, ZHANG Shengmeng, SUN Yuanwei, HUANG Weiwei, QIU Yibin, XU Hong, ZHANG Qi, LI Sha   

  1. (1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211800, China; 2. College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211800, China)
  • Published:2025-08-18

摘要: 通过优化毕赤酵母Komagataella phaffii GS115表达系统,显著提升高倍甜味蛋白Brazzein的分泌表达水平。首先成功获得重组菌株K. phaffii Bra-1,经摇瓶发酵优化,在甲醇诱导体积分数2%、生物素体积分数0.08%、温度30 ℃、初始pH 6.0的条件下,表达量达到90.2 mg/L。进一步表达元件筛选优化实验表明内源醇氧化酶1启动子(PAOX1)具有最优表达性能;αΔ57-70信号肽(SαΔ57-70)通过增强信号肽柔性使Brazzein表达量达到183.2 mg/L;共表达调控元件蛋白二硫键异构酶进一步将产量提高至209.3 mg/L。在5 L生物反应器中,调控诱导起始OD600为100、pH值恒定在5.0,通过分批补料策略使得Brazzein产量达到1.4 g/L。本研究为甜味蛋白Brazzein的规模化生产与应用奠定了基础。

关键词: 甜味蛋白;Brazzein;毕赤酵母;启动子;信号肽

Abstract: In this study, the expression system of Komagataella phaffii GS115 was optimized for improved secretion of the sweet protein Brazzein. The recombinant strain K. phaffii Bra-1 was successfully obtained, which produced 90.2 mg/L of Brazzein in shake flask fermentation under 2% methanol, 0.08% biotin, 30 ℃ and initial pH 6.0. Selection and optimization of expression elements showed that the endogenous alcohol oxidase 1 (AOX1) promoter had the best expression performance. The αΔ57-70 signal peptide increased the expression of Brazzein to 183.2 mg/L, which was further increased to 209.3 mg/L by the co-expression regulatory element, disulfide bond isomerase (PDI). In a 5 L bioreactor, fed-batch fermentation at an initial OD600 of 100 and a constant pH of 5.0 yielded 1.4 g/L of Brazzein. This study lays the foundation for the large-scale production and application of Brazzein.

Key words: sweet protein; Brazzein; Komagataella phaffii; promoter; signal peptide

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