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関連する概念動画

Protein-protein Interfaces02:04

Protein-protein Interfaces

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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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Introduction to Plant Diversity02:22

Introduction to Plant Diversity

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From Water to Land
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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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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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Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
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抗凍結タンパク質の相乗効果は,補完的な氷結合によって引き起こされる.

Tehilla Berger1, Konrad Meister2, Arthur L DeVries3

  • 1Department of Chemistry and Biochemistry , Yeshiva University , New York , New York 10016 , United States.

Journal of the American Chemical Society
|November 12, 2019
PubMed
まとめ

抗凍結タンパク質 (AFP) は,氷の増殖を阻害するために協力して働くことができます. この研究では,異なるAFPタイプが異なる氷結晶平面に結合すると,シネージが起こり,寒さに適応した生物の分布が説明されます.

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Identification of Plant Ice-binding Proteins Through Assessment of Ice-recrystallization Inhibition and Isolation Using Ice-affinity Purification
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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
08:46

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科学分野:

  • バイオ物理学
  • クリオバイオロジー
  • 分子生物学

背景:

  • 寒さに適応した生物は,氷を阻害する活動を持つ複数の抗凍結 (グリコ) タンパク質 (AFGP) の同型を持っています.
  • AFPの混合物は,シナジェスティックな強化を示すことができるが,その背後にあるメカニズムは不明である.

研究 の 目的:

  • AF(G) Pの混合物によるシナージスティックな氷の成長抑制のメカニズムを解明する.
  • AFP結合行動と相乗効果または対抗効果を相関させる.

主な方法:

  • 寒冷段階の顕微鏡,マイクロ流体,および光顕微鏡を用いてAF(G) Pのバイナリ混合物を研究した.
  • 氷の成長阻害作用を測定したAF(G) P混合物は様々な種から採取したものです.
  • 差異的に標識されたアイソフォームを使用して,氷結晶平面へのAFP結合を視覚化した.

主要な成果:

  • いくつかのAF(G) P混合物は,結合場所の競争により,相乗効果のある氷の成長阻害を示した.
  • 合成混合物には,異なる氷結晶平面に結合するAF(G) Pが含まれています.
  • 動的アイソフォームがプリズム平面に素早く結合し,被動的なアイソフォームがピラミッド平面に結合することを示す運動モデルが開発された.

結論:

  • この研究は,AF(G) Pのシナジーのための運動メカニズムを提供し,活性および受動的アイソフォームが強化された氷の抑制のためにどのように協力するか説明する.
  • この発見は,魚におけるAF(G) Pイソフォームの生物学的分布を説明するのに役立ちます.
  • この研究は,複数の阻害剤による 協同作用の氷結晶の成長阻害の背後にある物理化学を明らかにしています