相关实验视频

Updated: Jun 28, 2025

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

水性,侧链和盐如何影响无序蛋白质的尺寸

Michael C Baxa¹, Xiaoxuan Lin¹, Cedrick D Mukinay²

¹Department of Biochemistry & Molecular Biology, The University of Chicago, Chicago, Illinois, USA.

Protein science : a publication of the Protein Society

|April 12, 2024

概括

内在无序的蛋白质 (IDP) 往往保持扩展,挑战水效应.

科学领域:

蛋白质的结构和动态.
生物物理学的生物物理.
分子生物学分子生物学

背景情况:

许多内在无序蛋白质 (IDPs) 作为自我避免的随机行走 (SARWs) 行为,尽管它们具有折叠蛋白质典型的氨基酸组成.
水效应通常被认为是蛋白质折叠和崩的主要驱动因素.

研究的目的:

为了研究温度和离子条件如何影响百达克丁 (PNt) 的N端域的尺寸,一个IDP.
探索水相互作用和电荷分离在蛋白质疾病中的作用.
评估富含甘氨酸的蛋白质和溶液中的多脊柱的行为.

主要方法:

在不同温度 (10-58°C) 和离子强度下研究了PNT和降低雪抗蛋白 (red-sfAFP) 的尺寸.
使用弗洛里指数 (ν) 分析来描述链条尺寸.
采用交换实验来评估稳定的骨干键形成.

主要成果:

在温度和离子条件下,PNT保持扩展,弗洛里指数 (ν) >0.50.0.
PNt的热收缩被归因于疏水性侧链相互作用.
红色sfAFP是一种富含甘氨酸的蛋白质,在温度或离子强度方面显示出最小的尺寸变化,保持接近SARW的行为 (ν ≈ 0.54).
水对富含甘氨酸的序列充当了良好的溶剂,即使是连续的甘氨酸,红色-sfAFP变体也缺乏稳定的骨干键.

结论:

仅仅水效应是不足以驱动典型蛋白质序列中的显著链条崩.
许多内在无序的蛋白质在生理条件下保持扩展和无结构.
蛋白质乱和链扩张比以前认为的更为普遍的现象,受简单的疏水性之外的因素的影响.

关键词:

这是NMR的NMR.萨克斯 (SAXS) 的时间通过气结合,形成了气结合.交换气交换气交换气交换疏水性是指对水的疏水性.离子强度的离子强度溶剂质量溶剂质量展开的状态是展开状态.

更多相关视频

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments

Published on: November 1, 2024

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

Published on: April 2, 2015

相关概念视频

Protein Folding

Protein Folding

Intrinsically Disordered Proteins

Intrinsically Disordered Proteins

Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...

Protein and Protein Structure

Protein 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...

Protein Denaturation

Protein Denaturation

The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...

Protein Organization

Protein Organization

Entropy and Solvation

Entropy and Solvation

The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...