Video Experimental Relacionado
Updated: Feb 23, 2026

10:11
Author Spotlight: Investigating the Motion Dynamics of the Eukaryotic Replisome Components at the Single-Molecule Level
Published on: July 26, 2024
1.7K
El complejo de condensina es un motor mecanoquímico que se transloca a lo largo del ADN
Tsuyoshi Terakawa1, Shveta Bisht2, Jorine M Eeftens3
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
Resumen
La condensina es un motor molecular que se mueve a lo largo del ADN, ayudando a la organización de los cromosomas. Este descubrimiento revela su función mecanoquímica en la compactación.
Área de la Ciencia:
- Biología molecular
- La bioquímica
- La genética
Sus antecedentes:
- La condensina es esencial para la organización y compactación de los cromosomas.
- El mecanismo preciso de la función de la condensina no se comprende completamente.
Objetivo del estudio:
- Investigar el mecanismo molecular del papel de la condensina en la organización cromosómica.
- Para determinar si la condensina funciona como una proteína motora.
Principales métodos:
- Se emplearon técnicas de imagen de una sola molécula.
- El estudio se centró en la condensina de Saccharomyces cerevisiae.
Principales resultados:
- Se demostró que la condensina es un motor molecular.
- Muestra translocación dependiente de la hidrólisis del trifosfato de adenosina a lo largo del ADN de doble cadena.
- La condensina muestra una translocación rápida y altamente procesada, moviéndose ≥10 kilobases a ~60 pares de bases por segundo.
Conclusiones:
- La condensina funciona como un motor mecanoquímico, distinto de las proteínas motoras de ADN conocidas anteriormente.
- Este hallazgo proporciona información crucial sobre los mecanismos de la organización y la condensación de los cromosomas.
Videos de Conceptos Relacionados
Condensins
4.8K
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...
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...
4.8K
DNA Helicases
24.4K
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...
24.4K
Forces Acting on Chromosomes
4.0K
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...
Microtubules and motor proteins exert two types of forces on...
4.0K
Nucleosome Remodeling
11.3K
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
11.3K
Mechanical Protein Functions
5.8K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.8K
The Replisome
38.6K
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
38.6K

