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Protein-protein Interfaces02:04

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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The DNA Helix01:07

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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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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.
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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...
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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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タンパク質とDNAの単一結晶の間のタンパク質インターフェースの再定義

Benjamin E Partridge1, Peter H Winegar1, Zhenyu Han1

  • 1Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|June 7, 2021
PubMed
まとめ

研究者は タンパク質とタンパク質の相互作用を DNAの相互作用に置き換えて タンパク質の結晶をプログラムしました このDNA媒介による制御は,新しい材料の設計のためにタンパク質の組織を正確に調節することを可能にします.

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科学分野:

  • バイオマテリアル科学
  • クリスタルグラフィー
  • 分子生物学

背景:

  • タンパク質はナノスケールで多用途な構成要素ですが 複雑な原生相互作用により 組織を統制することが困難です
  • タンパク質の包装を正確に設計するために特定のタンパク質相互作用 (PPI) を修正することは,材料科学における重要な課題です.

研究 の 目的:

  • 保存されたPPIをDNAとDNAの相互作用に置き換えることで,結晶のタンパク質包装をプログラムできるかどうかを調査する.
  • DNA配列と結合点を設計することによって タンパク質の組織を意図的に制御する能力を実証する.

主な方法:

  • コンカナヴァリンA (ConA) をモデルタンパク質として利用し,そのマノース結合親和性を利用してDNAを非共性的に結合する.
  • 破壊されたネイティブ ConA PPIは,DNA結合を導入することによって結晶化に不可欠です.
  • 系統的に変化したDNA設計 (長さ,補完性,結合部位) が,ConAの結晶パッキングに影響を与えた.

主要な成果:

  • 本来のConA結晶化に起因する主要なPPIをDNAアソシエーションで成功裏に排除した.
  • 微妙なDNA設計の修正は ConAパッキングに 明確なプログラム可能な変化をもたらしました
  • 3つの新しいConA結晶構造を達成し,結晶学的な軸に沿ってパッキングの制御された拡張を示しました.

結論:

  • DNAは原生PPIを効果的に置き換えて 結晶物質にタンパク質をプログラムできます
  • このDNA媒介的なアプローチは 新種のタンパク質ベースのオーダーされた材料を 設計するための強力な戦略です
  • 発見はタンパク質結晶学における プログラム可能な自己組み立ての理解を進めている.