解开素脂-奎尔丁共价/非共价复合物的差异化机制:结构特征和动态结合行为
Danjun Guo1, Siying Wei1, Mingfei Song1
1College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China; Hubei Key Laboratory for Processing and Transformation of Agricultural Products (Wuhan Polytechnic University), Wuhan 430023, PR China.
Food chemistry
|December 16, 2025
概括
奎尔素与素聚酸 (CPP) 的共价和非共价结合以不同的方式改变了CPP的结构和特性. 共价结合会导致更显著的变化,影响蛋白质构成和水性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 食品科学 食品科学 食品科学
背景情况:
- 素脂 (CPP) 是一种从牛奶蛋白中提取的生物活性.
- 奎尔塞丁 (QR) 是一种具有抗氧化特性的黄类化合物.
- 了解CPP和QR之间的相互作用对于开发功能性食品和营养保健品至关重要.
研究的目的:
- 阐明共价和非共价素酸-酸 (CPP-QR) 复合物的结构差异和结合机制.
- 描述不同结合方式对CPP结构,形状和物理化学性质的影响.
- 为了比较共价和非共价CPP-QR复合物的形成机制和稳定性.
主要方法:
- 多光谱分析 (例如光谱) 来探测形状变化.
- 异热定位热度测量 (ITC) 用于确定结合热力学和固体测量.
- 分子动力学 (MD) 模拟用于可视化复杂结构和相互作用力.
主要成果:
- 共价键和非共价键都诱导了光火并降低了CPP表面的疏水性,而共价相互作用导致了更明显的效应.
- 共价结合显著改变了二次结构 (α-螺旋,β-转),而非共价结合引发了更广泛的变化 (α-螺旋,β-片,β-转,随机线圈).
- 微结构分析揭示了CPP,共价和非共价复合体的不同形态;MD模拟证实共价键主导共价复合体,而键和疏水相互作用主导非共价复合体.
结论:
- 结合模式 (共价与非共价) 显著影响CPP在与瑞相互作用时的结构和构造变化.
- 与非共价复合形成相比,共价复合形成导致CPP结构发生更大的改变,并表现出更强的结合亲和力.
- 这些发现为CPP-QR复合体形成的差异机制提供了洞察力,这与食品和制药行业的应用有关.
相关概念视频
The Equilibrium Binding Constant and Binding Strength
14.8K
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
14.8K
The Equilibrium Binding Constant and Binding Strength
9.9K
9.9K
Protein-Drug Binding: Mechanism and Kinetics
1.6K
Protein-drug binding refers to the interaction between drugs and proteins within the body. This binding process can occur intracellularly, involving drug interactions with enzymes or receptors within cells, or extracellularly, involving plasma proteins in the blood.
Various forces drive these interactions, including hydrogen bonds, hydrophobic interactions, ionic bonds, electrostatic interactions, and van der Waals forces. These bonds enable drugs to bind to specific sites on proteins,...
Various forces drive these interactions, including hydrogen bonds, hydrophobic interactions, ionic bonds, electrostatic interactions, and van der Waals forces. These bonds enable drugs to bind to specific sites on proteins,...
1.6K
Noncovalent Attractions in Biomolecules
63.0K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
63.0K
Complexation Equilibria: The Chelate Effect
1.1K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.1K
Protein-Drug Binding: Determination Methods
594
Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
594


