Video Experimental Relacionado
Updated: Jun 21, 2026
08:31
Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
Published on: June 8, 2018
Las ciclinas tipo D se asocian con múltiples proteínas quinasas y el factor de replicación y reparación del ADN PCNA
1Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, New York 11724.
Cell
|October 30, 1992
Resumen
La ciclina humana D1, una proteína relacionada con el cáncer, forma complejos con proteínas del ciclo celular como CDK y PCNA. Esto sugiere un papel en la replicación y reparación del ADN, conectando la oncogénesis a los mecanismos de proliferación celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La ciclina humana D1 está implicada en varias enfermedades proliferativas.
- La función bioquímica precisa de la ciclina D1 sigue siendo en gran medida desconocida.
- Comprender las interacciones de la ciclina D1 es crucial para descifrar su papel en la enfermedad.
Objetivo del estudio:
- Para investigar las interacciones bioquímicas de la ciclina humana D1.1.
- Para identificar las proteínas que se asocian con la ciclina D1 en los fibroblastos diploides.
- Para dilucidar la importancia funcional de los complejos de ciclina D1 en los procesos celulares.
Principales métodos:
- Los ensayos de coinmunoprecipitación identifican las proteínas que interactúan.
- Análisis de complejos proteicos formados con ciclina D1 y ciclina D3.
- Identificación de los polipéptidos asociados, incluidas las quinasas y los PCNA.
Principales resultados:
- La ciclina D1 forma complejos con las proteínas CDK2, CDK4 y CDK5.
- Se encontraron polipéptidos de 21 kDa (p21) y 36 kDa (PCNA) asociados con la ciclina D1.
- La ciclina D3 también se asocia con las proteínas quinasas, p21 y PCNA.
- La evidencia sugiere la formación de un complejo cuaternario que involucra D ciclina, CDK, PCNA y p21.
Conclusiones:
- La ciclina D1 y D3 se asocian con múltiples proteínas reguladoras del ciclo celular, incluidas las CDK y PCNA.
- Estos hallazgos proponen un complejo cuaternario que une a las D ciclinas, CDKs, p21 y PCNA.
- Esta investigación conecta una ciclina asociada a la oncogénesis humana con la replicación del ADN y los factores de reparación.
Videos de Conceptos Relacionados
01:02Long-patch Base Excision Repair
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
02:10Translesion DNA Polymerases
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
02:37Restarting Stalled Replication Forks
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...