通过计算设计,实现一种耐沸的单链甜蛋白单蛋白单林蛋白
Yanmei Liu1, Jiayu Xu1, Mingxue Ma1
1Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures, School of Life Sciences, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, PR China.
Food chemistry
|December 30, 2023
概括
工程甜蛋白显示了增强的热稳定性,提供了耐热的糖替代品. 这些蛋白质变体即使在沸后也保持甜味和溶解性,有可能用于食品工业的应用.
科学领域:
- 生物化学 生化学
- 蛋白质工程是指蛋白质工程.
- 食品科学 食品科学 食品科学
背景情况:
- 甜蛋白是具有低热量价值的天然糖替代品.
- 有限的热稳定性限制了甜蛋白在食品加工中的应用.
- 提高甜蛋白的热稳定性对于更广泛的工业用途至关重要.
研究的目的:
- 通过计算工程来设计和增强单链单烯 (MNEI) 的热稳定性.
- 为了识别甜的蛋白质变体,提高耐热性和保持甜度.
- 探索热稳定的甜蛋白质的蛋白质工程策略.
主要方法:
- 在PyRosetta中使用了ΔΔG计算,用于计算蛋白质设计.
- 产生和表征了21个单基因突变变异的MNEI.
- 根据结构见解设计和分析了14种多突变变体.
主要成果:
- 与MNEI相比,确定了11种单基因突变变体,其化温度增加 (Tm).
- 开发了四种多突变变体,Tm>>96°C (温度增加20°C).
- 实现了在沸后仍然溶解,并在各种pH条件下表现出稳定性的变体.
结论:
- 成功设计了具有食品应用潜力的高度热稳定的甜蛋白变体.
- 证明了计算方法提高蛋白质稳定性的有效性.
- 提供了对甜味蛋白质蛋白质工程策略的宝贵见解.
相关概念视频
01:22Protein Folding
Overview
02:15Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
01:24Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.