Video Experimental Relacionado
Updated: May 30, 2026
10:44
Mass Spectrometry and Luminogenic-based Approaches to Characterize Phase I Metabolic Competency of In Vitro Cell Cultures
Published on: March 28, 2017
¿El compuesto I varía significativamente entre las isoformas del citocromo P450?
Richard Lonsdale1, Julianna Oláh, Adrian J Mulholland
1Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, United Kingdom.
Journal of the American Chemical Society
|August 26, 2011
Resumen
Es poco probable que las diferencias en la estructura electrónica del compuesto I del citocromo P450 (CYP) expliquen las variaciones en la actividad de la isoforma humana. La presencia de sustrato disminuye ligeramente la estabilidad del Compuesto I a través de las isoformas del CYP.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Química computacional es la química computacional.
- Enzimología Enzimología.
Sus antecedentes:
- Las enzimas del citocromo P450 (CYP) son cruciales en el desarrollo de fármacos.
- Se supone que las diferencias en la reactividad de la isoforma del CYP se derivan de variaciones en la estructura electrónica del Compuesto I.
- Los modelos actuales a menudo asumen un Compuesto I uniforme en todas las isoformas del CYP.
Objetivo del estudio:
- Desarrollar un método para calcular la estructura electrónica y la entalpía de enlace Fe-O del Compuesto I. del CYP.
- Para investigar la estructura electrónica del Compuesto I en las isoformas humanas y bacterianas del CYP.
- Evaluar el papel de la estructura electrónica del Compuesto I en las diferencias de actividad de la isoforma del CYP.
Principales métodos:
- Empleando simulaciones de dinámica molecular para capturar la flexibilidad conformacional.
- Utilizando la teoría funcional de la densidad (B3LYP) con QM / MM para la optimización de la estructura.
- Cálculo de la estructura electrónica y estimación de la entalpía del enlace Fe-O para el Compuesto I.
Principales resultados:
- Las diferencias de estructura electrónica observadas en el Compuesto I entre las isoformas humanas del CYP son mínimas.
- Las variaciones dentro de una sola isoforma humana fueron mayores que las diferencias entre las isoformas.
- Se encontró una notable diferencia de estructura electrónica entre los CYP humanos y el P450 ((cam), vinculada al entorno de enlace de hidrógeno.
- La presencia de sustrato disminuyó la entalpía del enlace Compound I Fe-O, lo que indica una estabilidad reducida.
Conclusiones:
- Es poco probable que las diferencias en la estructura electrónica del Compuesto I sean el principal impulsor de las variaciones de actividad de la isoforma humana del CYP.
- La estructura electrónica distinta en P450 ((cam)) puede estar relacionada con su entorno de sitio activo específico.
- El compuesto I parece menos estable en presencia del sustrato, posiblemente debido al desplazamiento del agua.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:28Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes
Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450 isoenzymes,...
01:16Drug toxicity: Idiosyncratic Reactions
Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
02:37Disubstituted Cyclohexanes: cis-trans Isomerism
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
02:52Stereoisomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
02:33Stereoisomerism of Cyclic Compounds
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
01:27Pharmacogenetics of Drug Metabolism: Overview
Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...