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Videos de Conceptos Relacionados

DNA Helicases00:55

DNA Helicases

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

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During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
Microtubules and motor proteins exert two types of forces on...
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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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The Movement of Organelles and Vesicles01:43

The Movement of Organelles and Vesicles

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In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
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Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
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Video Experimental Relacionado

Updated: Jan 7, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Modelo de caminata aleatoria en tiempo continuo para el movimiento difusivo de las helicasas

Victor Rodríguez-Franco1, Michelle Marie Spiering2, Piero Bianco3

  • 1Small Biosystems Lab, Departament de Física de la Matèria Condensada, Facultat de Física, Universitat de Barcelona, Carrer de Martí i Franquès, 1, 08028 Barcelona, Spain.

QRB discovery
|December 25, 2025
PubMed
Resumen

Las helicasas de ADN son motores moleculares. El análisis de su movimiento revela que los estados de pausa son cruciales para la función y la eficiencia, lo que avanza nuestra comprensión de estas enzimas que procesan el ADN.

Palabras clave:
ADNcinética de reacciones biológicassistemas biomolecularesdifusióndinámica y funciónhelicasaspinzas magnéticas y ópticasmáquinas molecularescaminata aleatoriamolécula única

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Área de la Ciencia:

  • Biología Molecular
  • Biofísica
  • Bioquímica

Sus antecedentes:

  • Las helicasas de ADN son motores moleculares esenciales que desenrollan el ADN utilizando la hidrólisis de nucleótidos.
  • Comprender sus mecanismos precisos y su eficiencia es crucial para la comprensión de la replicación y reparación del ADN.

Objetivo del estudio:

  • Caracterizar los ciclos mecanoquímicos de tres ADN helicasas distintas (gp41, RecQ, RecG).
  • Investigar el papel de los estados de pausa y la eficiencia del motor utilizando técnicas biofísicas avanzadas.

Principales métodos:

  • Se utilizaron pinzas magnéticas y ópticas para rastrear el movimiento de la helicasa en horquillas de ADN.
  • Se empleó un marco de caminata aleatoria en tiempo continuo para analizar la velocidad y la difusividad.
  • Se midió la eficiencia del motor en condiciones variables de fuerza y ATP.

Principales resultados:

  • Se identificó un estado de pausa esencial fuera de la vía para todas las helicasas estudiadas.
  • La helicasa RecG demostró una alta eficiencia durante la operación cuesta arriba, a diferencia de gp41 y RecQ.
  • Las mediciones de difusividad proporcionaron información sobre la incertidumbre termodinámica y la eficiencia del motor.

Conclusiones:

  • Los estados de pausa pueden desempeñar un papel regulador en la actividad de la helicasa.
  • La eficiencia de la helicasa varía significativamente según su función (desenrollado frente a enrollamiento) y las condiciones de operación.
  • El análisis de las fluctuaciones ofrece una caracterización más completa de la actividad del motor molecular.