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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Protein and Protein Structure02:15

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 can...
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Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...

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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
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La respuesta del oxígeno singleto a la dinámica de las proteínas.

Rasmus Lybech Jensen1, Jacob Arnbjerg, Henrik Birkedal

  • 1Center for Oxygen Microscopy and Imaging, Chemistry Department, Aarhus University, DK-8000, Århus, Denmark.

Journal of the American Chemical Society
|April 16, 2011
PubMed
Resumen

La eliminación de oxígeno singlet por las proteínas está influenciada por la estructura de la proteína. Los cambios en la estructura de las proteínas, como la desnaturalización o la unión de ligandos, alteran la velocidad de la extinción del oxígeno en singlet, lo que afecta los procesos celulares.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Química Biología química.
  • Biología celular Biología celular.

Sus antecedentes:

  • El oxígeno molecular singlet (O2a) está involucrado en procesos biológicos, incluida la muerte celular.
  • Las reacciones entre el oxígeno singlete y las proteínas pueden alterar el comportamiento de las proteínas.
  • El impacto de la estructura de la proteína en el comportamiento del oxígeno singlete es poco estudiado.

Objetivo del estudio:

  • Investigar cómo los cambios estructurales de las proteínas afectan a la tasa de eliminación de oxígeno singlet.
  • Explorar el potencial del uso de la cinética del oxígeno singlet para monitorear la dinámica de las proteínas.

Principales métodos:

  • Estudió la constante de velocidad de la eliminación de oxígeno singlet por varias proteínas.
  • Manipulación de la estructura de las proteínas a través de la desnaturalización, aglomeración macromolecular, unión de ligandos y polimerización.

Principales resultados:

  • La desnaturalización de proteínas, el apiñamiento, la unión de ligandos y la polimerización alteran significativamente la constante de velocidad para la eliminación de oxígeno singlete.
  • Los cambios en la estructura de las proteínas que exponen u ocultan los residuos de aminoácidos afectan de manera medible las tasas de apagado de oxígeno.

Conclusiones:

  • La dinámica estructural de las proteínas juega un papel crucial en la modulación de la reactividad del oxígeno singleto.
  • Comprender estas interacciones es vital para comprender los eventos celulares mediados por oxígeno y su impacto en la función celular.