热诱导的形状转变和小米胺的自组装:多尺度结构分析
Liangxing Zhao1, Luman Sang1, Qingyu Zhao1
1College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; National Grain Industry (Highland Barley Deep Processing) Technology Innovation Center, Beijing 100083, China; National Grain and Oil Standards Research Verification and Testing Center, Beijing 100083, China.
Food chemistry
|January 10, 2026
概括
小米胺经历了热引起的结构变化,形成了不同的扰动,重组和聚合物稳定机制. 这项研究提供了通过热处理来定制植物蛋白质结构的见解.
科学领域:
- 食品科学与技术 食品科学与技术
- 蛋白质化学 蛋白质化学
- 材料科学是一种材料科学.
背景情况:
- 植物蛋白,如小米胺,是重要的食品成分.
- 了解它们的热行为对于食品加工和产品开发至关重要.
- 热引起的结构变化显著影响蛋白质的功能和组装.
研究的目的:
- 在25-100°C的温度范围内研究热感应的结构转变和小米胺的聚合.
- 为了确定不同的温度依赖的结构制度.
- 通过热处理为控制植物蛋白质结构提供一个框架.
主要方法:
- 差分扫描热度计 (DSC) 用于评估热稳定性.
- 颗粒大小分布分析.
- 提奥夫拉T光测定检测纤维状聚合物.
- 里叶变换红外 (FT-IR) 光谱法用于分析二次结构 (β-sheet内容).
- 测量泽塔电位以评估粒子表面电荷.
主要成果:
- 小麦胺在50°C左右表现出最小的热稳定性,这表明了形状扰动.
- 在70°C观察到重组和强化的分子间关联,粒子尺寸分布较窄.
- 在90-100°C时,纤维状聚合物形成,其特点是增加β-片含量,增强硫黄素T光度和改变的泽塔电位.
- 疏水性相互作用和键是跨温度聚合的关键驱动因素.
- 在整个热处理过程中,氨基酸成分保持不变.
结论:
- 鉴定出三种不同的温度依赖的小米胺结构模式:扰动,重组和紧聚合物的稳定.
- 热处理可以在战略上使用,以操纵小米胺结构和组装.
- 这些发现为设计热过程提供了一种实用方法,以根据各种应用量身定制植物蛋白质特性.
相关概念视频
Protein Folding
11.0K
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
11.0K
Protein Folding
126.0K
Overview
126.0K
Protein Organization
155.6K
Overview
155.6K
Protein Organization
9.0K
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....
9.0K
Protein Complex Assembly
16.6K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
16.6K
Bacterial Protein Maturation
441
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
441


