Video Experimental Relacionado

Updated: Feb 10, 2026

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Published on: January 17, 2025

Estructura y función del dominio transmembranar de NsaS, una histidina quinasa de detección de antibióticos en

Manasi P Bhate¹, Thomas Lemmin¹, Georg Kuenze²

¹Department of Pharmaceutical Chemistry , UC San Francisco , San Francisco , California 94158 , United States.

Journal of the American Chemical Society

|May 18, 2018

Resumen

Este estudio revela la estructura de NsaS, una histidina quinasa clave en Staphylococcus aureus, destacando su dominio transmembrana y su enlace flexible. Estas características son cruciales para detectar los antimicrobianos y la inmunidad innata durante las infecciones.

Área de la Ciencia:

Microbiología
Biología estructural
La bioquímica

Sus antecedentes:

Staphylococcus aureus utiliza cuatro quinasas histidinas intramembrana (HK) para responder a los antimicrobianos activos en la membrana y la inmunidad innata del huésped.
El NsaS es un HK crítico involucrado en estos mecanismos de defensa patógenos esenciales.

Objetivo del estudio:

Para aclarar el primer modelo estructural integrador de NsaS.
Comprender las bases estructurales de la función NsaS en la respuesta antimicrobiana y inmunológica.

Principales métodos:

Espectroscopia de resonancia magnética nuclear (RMN) en estado de solución.
Enlace cruzado químico junto con modelado molecular y simulaciones dinámicas.
Análisis de desplazamientos químicos, NOE heteronuclear y mediciones de intercambio H/D.

Principales resultados:

NsaS posee una hélice anfifílica N-terminal corta que ancla su paquete transmembrana (TM) en el prospecto de la membrana interna.
El dominio TM forma un haz dinámico de 4 hélices con deformaciones estructurales en la interfaz de la membrana.
Un vinculante de dímeros helicoidales marginalmente estable conecta el dominio TM con las regiones catalíticas del citoplasma, adoptando potencialmente diferentes conformaciones.

Conclusiones:

Las características estructurales de NsaS, incluido su haz TM y el enlace dinámico, son críticas para detectar perturbaciones de la membrana e iniciar vías de señalización.
Estos hallazgos proporcionan información sobre los mecanismos de resistencia de Staphylococcus aureus y las posibles dianas terapéuticas.

Más Videos Relacionados

Quantification of Bacterial Histidine Kinase Autophosphorylation Using a Nitrocellulose Binding Assay

Quantification of Bacterial Histidine Kinase Autophosphorylation Using a Nitrocellulose Binding Assay

Published on: January 11, 2017

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria

Published on: May 8, 2013

Videos de Conceptos Relacionados

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...

Structural Protein Function

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...

Structural Protein Function

Structural Protein Function

Conservation of Protein Domains Over Different Proteins

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...

Fruit Development, Structure, and Function

Fruit Development, Structure, and Function

Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.

Antibiotic Selection

Antibiotic Selection