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Atomic Structure01:33

Atomic Structure

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Overview
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Atomic Structure01:17

Atomic Structure

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The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one...
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Seed Structure and Early Development of the Sporophyte02:33

Seed Structure and Early Development of the Sporophyte

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Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
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Electronic Structure of Atoms02:28

Electronic Structure of Atoms

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to...
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Contrast-Matching Detergent in Small-Angle Neutron Scattering Experiments for Membrane Protein Structural Analysis and Ab Initio Modeling
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種から直接: 原子解像度のタンパク質構造 by ab initio MicroED

Purna Chandra Rao Vasireddy1, Timothy Low-Beer1, Katherine A Spoth1,2

  • 1Department of Structural Biology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, The State University of New York, Buffalo, NY, USA.

Nature communications
|February 14, 2026
PubMed
まとめ

研究者は,マイクロクリスタル電子 difraktion (MicroED) を使用して,原子解像度のタンパク質構造を達成しました. クランビンタンパク質に適用されたこの方法は,最初から構造をうまく解き,高解像度電子結晶学の新しい基準を提供しました.

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科学分野:

  • 構造生物学 構造生物学とは
  • バイオフィジックス 生物物理学
  • クリスタログラフィーです.

背景:

  • タンパク質の構造の決定は,生物学的機能を理解するために非常に重要です.
  • マイクロクリスタル電子 difrraction (MicroED) は,小さなまたは敏感な結晶のためのX線結晶学に有望な代替案を提供しています.
  • 高解像度を達成することや,MicroEDで ab initio の解像度構造を実現することは,依然として課題です.

研究 の 目的:

  • MicroEDを使用して種子タンパク質クランビンの原子解像度構造を決定する.
  • マイクロEDでアビニシオ構造ソリューションのベンチマークを確立する.
  • MicroEDデータに対するシリアル・マージングとアニソトロピーの補正の有効性を実証する.

主な方法:

  • エタノール浄化滴からタンパク質ナノ結晶の自発的形成.
  • 58個のナノ結晶の微結晶電子 difraktion (MicroED) を使用したデータ収集.
  • 微分データとアニソトロピーを意識した断片化の連続合併.
  • Ab initio構造溶液は,フェージングのために5つの残留の螺旋断片を使用しています.

主要な成果:

  • クランビンの原子解像度 (0.85 Å) のマイクロED構造は,最初から解けられました.
  • 自動モデルの構築と個々の水素原子の解像度が達成されました.
  • この研究では,特殊な設備なしで MicroED のサブ-ångström 解像度が成功していることが示されています.

結論:

  • MicroEDに適したタンパク質ナノ結晶は容易に入手できます.
  • アニソトロピーの補正と組み合わせたシリアル融合は,最初からMicroED構造ソリューションを可能にします.
  • この研究は,標準の計測器における高解像度のマイクロEDの基準となる.