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Videos de Conceptos Relacionados

Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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What are Proteins?01:28

What are Proteins?

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Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino acids. However, polypeptides have a molecular weight of fewer than 10,000 daltons, while proteins have greater molecular weight.  Polypeptides with less than 20 amino acids are called oligopeptides or simply peptides. Interactions among the constituent amino acid side chains of proteins help them fold into a stable 3-dimensional...
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Overview of Protein Metabolism01:21

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
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Amino Acid Biosynthetic Pathways01:29

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Protein Folding01:22

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Amino Acid Catabolism01:18

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Video Experimental Relacionado

Updated: Sep 9, 2025

Extraction of Non-Protein Amino Acids from Cyanobacteria for Liquid Chromatography-Tandem Mass Spectrometry Analysis
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Actividades de las proteínas impulsadas por la composición de aminoácidos

Sean M Cascarina1, Eric D Ross1

  • 1Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523, USA.

The Journal of biological chemistry
|August 30, 2025
PubMed
Resumen

Algunas proteínas funcionan en base a la composición de aminoácidos, no sólo la secuencia. Esta revisión explora las "actividades de proteínas impulsadas por la composición" y sus implicaciones para comprender la función de las proteínas.

Palabras clave:
Composición de los aminoácidosCondensado biomolecularProteína intrínsecamente desordenadaSeparación de la fase líquido-líquidodominio de baja complejidadel priónDominio parecido al prióngránulos de tensiónestructura-funcióntranscripción

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Last Updated: Sep 9, 2025

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Área de la Ciencia:

  • Bioquímica de las proteínas
  • Biología molecular
  • La biofísica

Sus antecedentes:

  • El dogma central de la bioquímica de las proteínas postula que la secuencia de aminoácidos primarios dicta la estructura y la función de las proteínas.
  • Sin embargo, ciertas regiones de proteínas exhiben actividades regidas principalmente por su composición de aminoácidos, desafiando el paradigma centrado en la secuencia.

Objetivo del estudio:

  • Revisar el concepto de "actividades basadas en la composición de las proteínas".
  • Discutir los criterios experimentales para identificar y clasificar estas actividades.
  • Para explorar la relación entre la secuencia primaria, la composición de aminoácidos y la función de la proteína.

Principales métodos:

  • Revisión de la literatura y síntesis de las investigaciones existentes.
  • Análisis de la evidencia experimental de las actividades de las proteínas basadas en la composición.
  • Análisis comparativo de los determinantes funcionales basados en secuencias frente a los basados en composición.

Principales resultados:

  • Criterios experimentales identificados y definidos para clasificar las actividades de las proteínas como determinadas por la composición.
  • Se ilustra cómo estos criterios se diferencian de los mecanismos tradicionales basados en secuencias.
  • Ejemplos existentes caracterizados de proteínas que exhiben actividades impulsadas por la composición.

Conclusiones:

  • Las actividades basadas en la composición de proteínas representan una perspectiva emergente en la ciencia de las proteínas.
  • Este concepto ofrece un nuevo marco para comprender la relación secuencia-función en clases específicas de proteínas.
  • La reevaluación de la función de la proteína a través de la lente de la composición puede descubrir nuevos mecanismos biológicos.