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Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
DNA Packaging00:58

DNA Packaging

Overview
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Chromatin Packaging02:21

Chromatin Packaging

Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
Chromatin Packaging01:32

Chromatin Packaging

Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...

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DNAアセンブリされた銀ナノクラスターにおけるプラズモン結合

Qiong Wu1, Chengcheng Liu1, Cheng Cui1,2

  • 1Center for Research at Bio/Nano Interface, Department of Chemistry and Department of Physiology and Functional Genomics, UF Health Cancer Center, UF Genetics Institute and McKnight Brain Institute, University of Florida, Gainesville, Florida 32611-7200, United States.

Journal of the American Chemical Society
|August 31, 2021
PubMed
まとめ

DNA-シルバーナノクラスター (DNA-AgNCs) のような量子サイズの金属クラスターは,プラズモンの結合を示すことができます. この研究は,組み立てられたDNA-AgNCにおけるプラズモンの結合の実験的証拠を提供し,新しいプラズモンの装置のための扉を開きます.

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科学分野:

  • * プラズモニクスとナノフォトニクス
  • * 量子ドットとナノクラスター科学
  • * 超分子化学とナノ材料

背景:

  • * 量子サイズの金属クラスターは理論的には集団プラズモンの刺激をサポートします.
  • * 数原子の金属クラスターにおけるプラズモンの結合に関する実験的証拠は稀である.
  • * DNAテンプレートされた銀ナノクラスター (DNA-AgNCs) は,制御された組み立てのためのプラットフォームを提供します.

研究 の 目的:

  • * 組み立てられたDNA-AgNCにおけるプラズモンの結合を調査する.
  • * 組立距離の関数としてDNA-AgNCの光学吸収特性を探求する.
  • * プラズモンカップリングの応用のためのDNA-AgNCの可能性を決定する.

主な方法:

  • * DNAテンプレートAgナノクラスター (DNA-AgNCs) の合成
  • * クラスタ間の距離を制御するためのDNAハイブリッド化によるDNA-AgNCの組み立て.
  • * 集積時にスペクトルシフトを分析するための光学吸収スペクトル検査.
  • * 吸収機構と電場強化を理解するための時間依存密度関数理論 (TDDFT) シミュレーション.

主要な成果:

  • * 組み立てられたDNA-AgNCの光学吸収ピークは,プラズモンのカップリングの特徴であるクラスタ間の距離に対する感受性を示した.
  • * TDDFTシミュレーションでは,二極電荷分布と多重トランジションによる個々のDNA-AgNCにおける吸収のプラズモンの起源が確認されました.
  • * 実験結果とシミュレーション結果は一貫したピークシフト傾向を示し,組み立てられたDNA-AgNC間のプラズモンカップリングの存在を示唆した.

結論:

  • * 量子サイズの構造,特にDNA-AgNCは,プラズモンのカップリングをサポートできます.
  • * DNA-AgNCは,超小型,場所固有の,生物互換性のあるプラズモンの結合装置の構成要素として潜在性を示しています.
  • * この発見により,ナノスケールシステムにおけるプラズモンの現象とそのデバイスの応用に関する理解が進んでいます.