Video Experimental Relacionado
Updated: Jun 10, 2026
10:24
NMR-Based Activity Assays for Determining Compound Inhibition, IC50 Values, Artifactual Activity, and Whole-Cell Activity of Nucleoside Ribohydrolases
Published on: June 30, 2019
Estudio teórico sobre la inhibición de la ribonucleotide reductasa por el
Susana Pereira1, Pedro Alexandrino Fernandes, Maria João Ramos
1REQUIMTE, Departamento de Química, Faculdade de Ciências do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal.
Journal of the American Chemical Society
|April 7, 2005
Resumen
Los 2'-Mercapto-2'-deoxyribonucleoside-5'-difosfatos (SHdNDP) inhiben la ribonucleótido reductasa (RNR), una enzima crucial para la síntesis del ADN. Este estudio aclara los mecanismos de reacción de la inactivación SHdNDP de RNR, con y sin oxígeno, ayudando en el desarrollo de nuevas terapias contra el cáncer.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Enzimología Enzimología.
- Química Medicinal La Química Medicinal es el campo de la Química Medicinal.
Sus antecedentes:
- La ribonucleotide reductasa (RNR) es esencial para la síntesis de ADN y un objetivo para el cáncer y las terapias antivirales.
- Los 2'-Mercapto-2'-deoxyribonucleoside-5'-difosfatos (SHdNDP) son inhibidores conocidos de la RNR con actividad demostrada in vitro e in vivo.
- Estudios anteriores indicaron que la actividad de SHdNDP es dependiente del oxígeno.
Objetivo del estudio:
- Para investigar el mecanismo de inactivación de RNR por SHdNDP.
- Para dilucidar las vías químicas involucradas en la inhibición de RNR por SHdNDP, considerando el papel del oxígeno molecular.
Principales métodos:
- Se emplearon cálculos teóricos para modelar las reacciones entre SHdNDP y el sitio activo de RNR.
- Se utilizaron enfoques de química computacional para explorar los mecanismos de reacción.
Principales resultados:
- Vías mecánicas propuestas para la inactivación de RNR por SHdNDP tanto en la ausencia como en la presencia de oxígeno molecular.
- Se aclararon eventos químicos detallados que ocurren durante la inhibición de RNR por SHdNDP.
Conclusiones:
- El estudio proporciona una comprensión refinada de la inactivación de RNR por SHdNDP.
- Los mecanismos propuestos complementan la literatura existente y ofrecen ideas para el diseño de nuevos agentes quimioterapéuticos dirigidos a RNR.
Videos de Conceptos Relacionados
02:27Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
02:47Ribozymes
The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Ribozymes can be...
01:11Restriction Enzymes
Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
01:28Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
01:30Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
01:22Antiviral Nucleoside Inhibitors
Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...