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関連する概念動画

Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

54.5K
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,...
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Condensins02:15

Condensins

3.6K
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
3.6K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

915
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
915
Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation01:01

Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation

3.8K
Benzaldehyde, like formaldehyde, lacks an α hydrogen and cannot enolize to form an enolate. Hence, the reaction of benzaldehyde with a ketone in the presence of an aqueous base forms a single crossed product. This reaction is referred to as Claisen–Schmidt condensation.
As the self-condensation of ketones is generally not favored in basic conditions, the self-condensed products do not form in the reaction between ketones and benzaldehyde. The general reaction of Claisen–Schmidt...
3.8K
Protein Folding01:22

Protein Folding

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関連する実験動画

Updated: Sep 9, 2025

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells

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単一成分生物分子コンデンサット内のクラスタリング

Ankith Sharma1,2, Abhishek Sau1,2, Sandeep Dave1

  • 1Department of Cell Biology and Genetics, Texas A&M University; College Station, TX, USA.

bioRxiv : the preprint server for biology
|September 2, 2025
PubMed
まとめ

生物分子凝縮物 (BMC) は複雑な内部構造を示しています. 単純なFused in Sarcoma (FUS) 凝縮物でさえ,時間とともにクラスタリングと変化した移動性を示し,固体ネットワークではなく,スポンジのような組織を示唆しています.

さらに関連する動画

Spatial Separation of Molecular Conformers and Clusters
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Spatial Separation of Molecular Conformers and Clusters

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Author Spotlight: Developing Synthetic Cells from Programmable Amphiphilic DNA Nanostructures
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Author Spotlight: Developing Synthetic Cells from Programmable Amphiphilic DNA Nanostructures

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関連する実験動画

Last Updated: Sep 9, 2025

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells

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Spatial Separation of Molecular Conformers and Clusters
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科学分野:

  • 細胞生物学
  • バイオ物理学
  • 生物化学

背景:

  • 生物分子凝縮物 (BMC) は,生物学的プロセスに不可欠な非膜結合細胞部位である.
  • 機能は内部組織と 分子動力学に依存します
  • 変異したBMCは,タンパク質の蓄積疾患に関与しています.

研究 の 目的:

  • Fused in Sarcoma (FUS) コンデンサートのナノスケール構造および機能的性質を調査する.
  • BMC内のFUSモノメアの動態を理解する.
  • 凝縮物老化,構造変化,分子移動性の関係を探求する.

主な方法:

  • 単一分子顕微鏡
  • 先進的な顕微鏡技術
  • コンデンサの物理的性質とモノマー拡散の分析

主要な成果:

  • シングルコンポーネントのFUSコンデンサは,内部クラスタリングとより高いFUS密度を示しています.
  • 老化により物理的性質が変化し,モノメールの移動性が低下する.
  • 大量のFUSモノメアは高度な移動性を維持し,スポンジのような構造を示しています.
  • コンデンサは,異なる構造的接続性との間の偽均衡を示します.

結論:

  • 単純なFUSコンデンサはナノスケール構造の複雑さを持っています.
  • 観察されたモビリティパターンは,単純でシステム全体にわたるネットワークの概念に挑戦しています.
  • これらの発見は,BMCはダイナミックな偽均衡状態を保ち,その機能に影響を与えることを示唆しています.