与C结合的抗糖蛋白类型的溶液构成和冰再结晶的调制
Roger Y Tam1, Christopher N Rowley, Ivan Petrov
1Department of Chemistry, D'Iorio Hall, 10 Marie Curie, University of Ottawa, Ottawa, ON, Canada K1N 6N5.
Journal of the American Chemical Society
|October 15, 2009
概括
具有特定侧链长度的防糖蛋白 (AFGPs) 类似物显示出强大的冰再结晶抑制作用. 微妙的形状变化,而不是骨干结构,决定了防活性.
科学领域:
- 生物化学 生物化学
- 材料科学 材料科学 材料科学
- 结构生物学 结构生物学
背景情况:
- 防糖蛋白 (AFGPs) 通过抑制冰的生长,使其能够在零度以下的环境中生存.
- 合成的C链AFGP类似物为各种应用提供量身定制的防活性.
- 这些类似物是强大的冰再结晶抑制剂 (IRI),但缺乏热歇斯底里.
研究的目的:
- 调查C链AFGP类型的侧链长度如何影响冰再结晶抑制 (IRI) 活性.
- 探索分子构造和IRI强度之间的关系.
主要方法:
- 合成具有不同侧链长度的C链AFGP类似物.
- 循环二元化 (CD) 光谱法用于分析聚酸骨干结构.
- 可变温度 (1) H NMR 和分子动力学模拟以研究侧链形状和相互作用.
主要成果:
- 模拟物5 (三碳侧链) 显示出强烈的IRI,而模拟物4,6和7 (四碳,二碳和一碳) 显示出没有活动.
- 磁盘光谱检测显示所有类型的模拟物具有随机的线圈形状,排除了长距离的结构变化作为活动的原因.
- 分子动力学模拟显示,活性模拟物 (26,n=3) 采用折叠的侧链形状,将碳水化合物与溶剂分离,与具有延伸侧链的非活性模拟物不同.
结论:
- 在C链的AFGP类似物中,IRI活性严重依赖于含胺的侧链的精确长度.
- 短距离的形状变化,特别是侧链的折叠,是高IRI活动的关键.
- 碳水化合物部分的方向受侧链形状的影响,显著影响防性能.
相关概念视频
Recrystallization: Solid–Solution Equilibria
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
Freezing Point Depression and Boiling Point Elevation
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
Crystal Growth: Principles of Crystallization
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...


