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Videos de Conceptos Relacionados

Antibody Structure01:10

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Conjugated Proteins02:50

Conjugated Proteins

Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Rab Proteins01:14

Rab Proteins

Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Antibody Actions01:26

Antibody Actions

Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...

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Proteína anticongelante hiperactiva en un pez.

Christopher B Marshall1, Garth L Fletcher, Peter L Davies

  • 1Department of Biochemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.

Nature
|May 14, 2004
PubMed
Resumen

Los peces polares poseen proteínas anticongelantes para sobrevivir a temperaturas bajo cero. Una proteína anticongelante recientemente descubierta y altamente activa en la flor de invierno explica su notable resistencia a las aguas polares heladas.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Marina Biología Marina.
  • Zoología Zoología Zoología.

Sus antecedentes:

  • Los peces polares utilizan proteínas plasmáticas anticongelantes para evitar la congelación.
  • Las proteínas anticongelantes existentes en la borla de invierno (Pleuronectes americanus) muestran una actividad limitada en aguas heladas.

Objetivo del estudio:

  • Para identificar y caracterizar las proteínas anticongelantes en la borla de invierno.
  • Para explicar el mecanismo de resistencia al congelamiento de la borla de invierno en entornos polares.

Principales métodos:

  • Aislamiento y caracterización de las proteínas anticongelantes del plasma de la borla de invierno.
  • Análisis de la actividad de la proteína anticongelante.

Principales resultados:

  • Se descubrió una nueva proteína anticongelante altamente activa en la borboleta de invierno.
  • La actividad de esta proteína es comparable a las proteínas anticongelantes de los insectos.
  • La proteína recién identificada evita efectivamente la congelación en el agua de mar helada.

Conclusiones:

  • La proteína anticongelante descubierta confiere una significativa resistencia al congelamiento a la borla de invierno.
  • Este hallazgo aclara la estrategia de supervivencia de la borla de invierno en los ecosistemas marinos polares y subpolares.