Video Experimental Relacionado
Updated: Aug 4, 2026
09:34
Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
Published on: February 6, 2020
Resumen
Los investigadores identificaron la estructura de la sustancia de reacción lenta de la anafilaxia (SRS-A) como el leucotrieno C, formado a través de una nueva vía. El SRS biológicamente activo se produjo en un sistema libre de células, destacando las funciones esenciales del glutatión y el calcio en su síntesis.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Inmunología Inmunología.
- Biología celular Biología celular.
Sus antecedentes:
- Los basófilos y los mastocitos liberan mediadores químicos como el SRS-A tras la estimulación del antígeno.
- SRS-A es un potente broncoconstrictor involucrado en las reacciones alérgicas.
Objetivo del estudio:
- Para dilucidar la estructura de SRS.
- Para investigar el camino de la formación de SRS.
- Para producir SRS biológicamente activo en un sistema libre de células.
Principales métodos:
- Estimulación de las células de la leucemia basófila (RBL-1) en ratas.
- Incubación de homogenatos de células RBL-1 con ácido araquidónico.
- Análisis de mediadores sintetizados utilizando ensayos bioquímicos.
Principales resultados:
- La estructura del SRS fue identificada como leucotrieno C, un tioéter del ácido araquidónico y el glutatión.
- Se propuso una nueva vía de lipoxigenasa que involucra leucotrieno A (LTA) y leucotrieno B (LTB).
- El SRS biológicamente activo se produjo con éxito en un sistema libre de células.
- Se encontró que el glutatión y el calcio son esenciales para la síntesis de SRS.
Conclusiones:
- La estructura de SRS-A es el leucotrieno C, sintetizado a través de una nueva vía de lipoxigenasa.
- Un sistema libre de células puede generar SRS biológicamente activo, confirmando las funciones del glutatión y el calcio.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:13Induced-fit Model
Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
02:34Enzymes
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
03:01The Replisome
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
01:28ATP and Macromolecule Synthesis
Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
01:27Fast Reactions
Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...