中性溶液中の二酸化ナトリウム5'-グアノシンモノフォスファートの自己組み立ての螺旋状構造
1Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6. gang.wu@chem.queensu.ca
Journal of the American Chemical Society
|February 10, 2009
まとめ
シングルヌクレオチドグアノシン5'-モノフォスファート (5'-GMP) は,自発的に自己アセンブリして,右手ヘリックスになります. この構造は,Z-DNAを模倣し,prebiotic RNA形成の洞察を提供する,交替する砂糖パッカーを展示しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 生命の起源 生命の起源とは
背景:
- DNAやRNAのような核酸は,フォスフォディエステル結合で結びついた核酸のポリマーである.
- これらの分子は通常,右手のB-DNAとA-DNA/RNA,左手のZ-DNAを含む螺旋状の構造を形成します.
- プレバイオティック条件下での複雑な核酸構造の形成は,依然として活発な研究分野です.
研究 の 目的:
- 個々のヌクレオチドの自己組立特性を調査する.
- セルフ・アセンブリド・ヌクレオチド構造の構造特性を探求する.
- 単純なヌクレオチドアセンブリがRNAの起源に関する理論に情報を提供できるかどうかを判断する.
主な方法:
- グアノシン5オミノモノフォスファート (5オミノ-GMP) を中性溶液で使用した自発的自己組み立て実験.
- 5つのオミノ-GMPによって形成された自己組み立ての螺旋構造の構造分析.
- 観察された螺旋状構造と既知のDNAおよびRNA構成の比較.
主要な成果:
- グアノシネス5オミノモノフォスファート (5オミノ-GMP) は,中性溶液で自発的に右ヘリックスを形成する.
- 螺旋構造は,5つのオミノ-GMP分子間の水素結合によって安定化され,共振性リン酸エステル結合ではありません.
- 5オミノ-GMPヘリクスは,C2オミノ-オミノ-エンドとC3オミノ-オミノ-エンドの砂糖パッカーを交互に表示しており,以前は左利きZ-DNAのみで観察されていた特徴です.
結論:
- 単一のヌクレオチド,5オミノ-GMPの自己組み立ては,複雑な螺旋構造を生成することができます.
- 5オミノ-GMPの観察された螺旋状構造は,前生物学的条件下で早期のRNAオリゴーマー形成の潜在的なモデルを提供します.
- 類似の自己組み立て現象は,他の核酸系でも発生し,分子組織の一般的な原理を示唆する.
関連する概念動画
Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...
Protein Organization
Overview
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.
Septins
Septins are protein filaments forming the cytoskeleton along with the microtubules, microfilaments, intermediate filaments, and other accessory proteins. In 1971 while studying the cell division cycle in mutant Saccharomyces cerevisiae Harwell et al. first identified the septin-related genes playing a crucial role in yeast cytokinesis. Fluorescence microscopy revealed that these proteins localize at the budding neck as rings. These ring-like proteins were then named Septins by John Pringle, and...
Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...


