Video Experimental Relacionado
Updated: Jan 24, 2026
10:58
Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
Published on: July 25, 2013
17.6K
Diseño de novo de cambios de conformación sintonizables basados en el pH
Scott E Boyken1,2, Mark A Benhaim3, Florian Busch4
1Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.
Science (New York, N.Y.)
|May 18, 2019
Resumen
Los científicos diseñaron proteínas sensibles al pH que cambian de forma a niveles específicos de acidez. Estas nuevas proteínas pueden interrumpir las membranas celulares, mostrando cambios conformacionales de proteínas programables.
Área de la Ciencia:
- Ingeniería de proteínas
- La bioquímica
- Biología molecular
Sus antecedentes:
- Los cambios conformacionales de las proteínas son vitales para las funciones biológicas.
- El diseño de proteínas con conformaciones conmutables es un desafío significativo.
- El diseño anterior de la proteína de novo se centró en estados estables individuales.
Objetivo del estudio:
- Desarrollar una estrategia general para el diseño de interruptores conformacionales de proteínas sensibles al pH.
- Para permitir un control preciso de las transiciones de la estructura de las proteínas basado en el pH ambiental.
- Para crear nuevas proteínas capaces de activar la función del medio ambiente.
Principales métodos:
- Diseño de estructuras de proteínas con residuos de histidina preorganizados en redes de enlaces de hidrógeno enterrados.
- Creación de homotrimeros y heterodimeros con contenido de histidina controlado y interacciones hidrofóbicas.
- Evaluación de la estabilidad de las proteínas, los cambios conformacionales a pH variable y las capacidades de ruptura de la membrana.
Principales resultados:
- Homotrimeros y heterodimeros estables diseñados con éxito que sufren cambios de conformación a gran escala por debajo de pH 6,5.
- Control demostrado sobre el pH de transición y la cooperatividad mediante la modulación de las redes de histidina e interacciones hidrofóbicas.
- Disrupción in vitro e in vivo de las membranas lipídicas por las proteínas diseñadas en el momento del desmontaje.
Conclusiones:
- Se ha establecido una estrategia general para programar cambios conformacionales de proteínas desencadenados por el medio ambiente a través del diseño de novo.
- Las redes diseñadas basadas en histidina permiten un control preciso del comportamiento de las proteínas sensibles al pH.
- Estas proteínas de ingeniería muestran potencial para aplicaciones que requieren la interrupción de la membrana dirigida.
Videos de Conceptos Relacionados
01:20Conformity
47.9K
Conformity is the change in a person’s behavior to go along with the group, even if that person does not agree with the group.
47.9K
02:20Conformations of Butane
17.8K
Unlike ethane and propane that have only two major conformations, butane has more than two conformers. The staggered form of butane in which the bulky methyl groups on the two carbons are placed on opposite sides, that is, at a dihedral angle of 180°, is the lowest energy, most stable form — called the anti conformer. This conformation is stabilized due to the absence of steric repulsion between the largely spaced out methyl groups. The other two staggered conformations are...
17.8K
02:29Conformations of Cycloalkanes
14.2K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3 hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
14.2K
02:11Conformations of Cyclohexane
15.3K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
15.3K
02:01Group Design
10.3K
The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
10.3K
02:18Conformations of Ethane and Propane
16.9K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
16.9K