Video Experimental Relacionado

Updated: Feb 15, 2026

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation

Published on: August 1, 2018

Impacto del patrón de columna vertebral y la sustitución de residuos en la helicidad de los péptidos α/β/γ

Young-Hee Shin¹, Samuel H Gellman¹

¹Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.

Journal of the American Chemical Society

|January 20, 2018

Resumen

Los péptidos alfa/beta/gamma (α/β/γ) muestran propensión helicoidal incluso con residuos gamma no sustituidos. Las variaciones de secuencia mantienen esta fuerte capacidad de formación de hélices, lo que indica andamios pépticos versátiles.

Área de la Ciencia:

Biología Química
La bioquímica
Química de los polímeros

Sus antecedentes:

Trabajos anteriores identificaron péptidos α/β/γ con una repetición hexada específica que adopta estructuras similares a la hélice α.
La estabilidad de la hélice se relacionó con las restricciones cíclicas de los residuos β y γ, siendo las restricciones β más críticas.

Objetivo del estudio:

Evaluar ampliamente el impacto de la sustitución de residuos γ en la estabilidad de la hélice en los péptidos α/β/γ.
Investigar cómo las variaciones de secuencia afectan la propensión helicoidal de estos péptidos.

Principales métodos:

Espectroscopia de dicroísmo circular para medir la helicidad.
Espectroscopia de resonancia magnética nuclear (2D) para el análisis estructural.

Principales resultados:

Incluso los residuos γ no sustituidos (del ácido γ-aminobutírico) soportan una propensión helicoidal moderada.
La relajación de las restricciones de residuos γ provocó sólo una disminución moderada de la helicidad.
La fuerte propensión a la formación de hélices de los péptidos α/β/γ se mantiene a través de variadas secuencias y colocaciones de residuos.

Conclusiones:

Los péptidos α/β/γ exhiben una robusta estabilidad helicoidal, incluso con residuos γ menos restringidos.
La flexibilidad de la secuencia dentro de los péptidos α/β/γ permite diversas ubicaciones mientras se mantiene la propensión helicoidal.
Estos hallazgos destacan los andamios de péptidos α/β/γ como plataformas versátiles para el diseño de foldameres péptidos funcionales.

Más Videos Relacionados

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

Published on: January 26, 2016

Residue-Specific Exchange of Proline by Proline Analogs in Fluorescent Proteins: How "Molecular Surgery" of the Backbone Affects Folding and Stability

Residue-Specific Exchange of Proline by Proline Analogs in Fluorescent Proteins: How "Molecular Surgery" of the Backbone Affects Folding and Stability

Published on: February 3, 2022

Videos de Conceptos Relacionados

Reactions of α-Halocarbonyl Compounds: Nucleophilic Substitution

Reactions of α-Halocarbonyl Compounds: Nucleophilic Substitution

Nucleophilic substitution in α-halocarbonyl compounds can be achieved via an SN2 pathway. The reaction in α-haloketones is generally carried out with less basic nucleophiles. The use of strong basic nucleophiles leads to the generation of α-haloenolate ions, which often participate in other side reactions.

Conjugate Addition to α,β-Unsaturated Carbonyl Compounds

Conjugate Addition to α,β-Unsaturated Carbonyl Compounds

α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.

Protein and Protein Structure

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...

Residual Plots

Residual Plots

A residual plot is a statistical representation of data used to analyze correlation and regression results. It helps verify the requirements for drawing specific conclusions about correlation and regression. To obtain the residual plot, first, the residual for each data value is calculated, which is simply the vertical distance between the observed and the predicted value obtained from the regression equation.
When the residual values are plotted against the variable x, it is called a residual...

Residual Stresses

Residual Stresses

Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...