相关实验视频
Updated: Jul 14, 2026

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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
Published on: May 8, 2015
在酸中形成β-hairpins的新转折结构
James S Nowick1, Justin O Brower
1Department of Chemistry, University of California-Irvine, Irvine, CA 92697-2025, USA. jsnowick@uci.edu
Journal of the American Chemical Society
|January 23, 2003
概括
欧尼丁 (Orn) 形成了一种新的转结构,有效地稳定β-hairpins,类似于d-Pro-Gly. 这种Orn转向在诱导β-hairpin形成方面显示出优于Asn-Gly转向的优势.
科学领域:
- 生物化学 生物化学
- 类化学 类化学
- 结构生物学 结构生物学
背景情况:
- 众所周知,镜像β转换,特别是d-Pro-Gly,可以稳定β毛针.
- 之前的工作表明,1与d-Pro-Gly折叠成一个定义的β-hairpin.
研究的目的:
- 为了研究甲素 (Orn) 作为转向结构的组成部分,用于β-hairpin稳定.
- 为了比较基于Orn的转子与已建立的d-Pro-Gly和Asn-Gly转子的β-hairpin稳定能力.
主要方法:
- 合成一个含有Orn的类型 (2).
- 1H NMR 化学转移和核过度修复效应 (NOE) 研究以确定结构.
- 结构和折叠特性与对照的比较.
主要成果:
- 含有ORN的模拟物2折叠成一个明确的β-hairpin,结构上与1相似.
- 在稳定β-hairpins方面,Orn转优于Asn-Gly转.
- 将deltaOrn替换为epsilonLys或d-deltaOrn导致质没有显著折叠.
结论:
- 当通过其三角氨基基组连接时,甲尼丁形成一个转向结构,在稳定β-hairpins方面非常有效.
- 奥恩转向是d-Pro-Gly的可行和强大的替代品,用于诱导β-hairpin形成.
- 氨基酸的特定链接和立体化学反过来对有效的β-hairpin折叠至关重要.
相关概念视频
Protein Organization
Overview
Protein Folding
Overview
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 can...
A protein's shape is critical to its function. For example, an enzyme can...
Single-Strand DNA Binding Proteins
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
Protein 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.
Protein Folding
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...

