二重螺旋状のヘキシトール核酸の結晶構造
Ruben Declercq1, Arthur Van Aerschot, Randy J Read
1Biomolecular Architecture, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Leuven (Heverlee), Belgium.
Journal of the American Chemical Society
|February 7, 2002
まとめ
ヘキシトール核酸 (HNA) は,反感覚アプリケーションの安定性を高めます. この研究は,HNAダブルヘリクスの最初の高解像度構造を明らかにし,ユニークな形状と複雑な形成の可能性を示しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- オリゴヌクレオチド化学 オリゴヌクレオチド化学
背景:
- 化学的に改変されたオリゴヌクレオチドは,反感覚療法のために調査されています.
- ヘクシトール核酸 (HNA) は,独特のヘクシトール骨格を持つDNAアナログです.
- HNAは強いハイブリッド化とデュプレックス安定性を示しています.
研究 の 目的:
- ヘクシトールから完全に構成された二重ヘリキルの核酸の高解像度結晶構造を決定する.
- HNAダブルヘリクの構造特性と形状の柔軟性を分析する.
主な方法:
- X線結晶グラフィーです.
- オリゴヌクレオチド合成
- 核酸の構造分析
主要な成果:
- HNA オリゴーマー h ((GTGTACAC) の2つの異なる二重螺旋形状が決定されました.
- 両方の構造は,正常なワトソン・クリックの塩基配列と効率的な塩基堆積を示しています.
- 独特の深いメジャー・グルーヴと,水害性のマイナー・グルーヴが観察されました. 一つの形状は,HNAのダブルヘリックス・ネスティングを可能にします.
結論:
- HNA構造はA型ヘリクに似ており,ヘキシトール骨格はRNAのC3'-endo構造を模倣しています.
- HNAにおける軸のベース位置は,安定したダブルヘリックス形成を促進します.
- HNAの構造特性は,新しい核酸ベースの技術の可能性を示唆しています.
さらに関連する動画
14:55Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
Published on: September 17, 2017
09:15Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
Published on: January 10, 2018
関連する概念動画
02:22Structures of Solids
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:06Newman Projections
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
01:29Determination of Crystal Structures
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...