Video Experimental Relacionado
Updated: Jul 14, 2026
10:34
Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
Published on: April 24, 2014
El proceso de escape del monóxido de carbono de la mioglobina a la solución a temperatura fisiológica
Yasutaka Nishihara1, Masaaki Sakakura, Yoshifumi Kimura
1Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan.
Journal of the American Chemical Society
|September 24, 2004
Resumen
El monóxido de carbono (CO) escapa de la mioglobina a través de un sitio específico, influenciado por el xenón (Xe). La presión de Xe afecta las tasas de escape de CO, revelando la captura de CO en el sitio de Xe antes de su liberación en solución.
Área de la Ciencia:
- La biofísica es la biofísica.
- Química Física es la química física.
Sus antecedentes:
- La mioglobina (Mb) es una proteína que se une y almacena oxígeno.
- El monóxido de carbono (CO) es un ligando que se une al hierro hemo en Mb.
- Comprender los mecanismos de escape de los ligandos es crucial para los estudios de la función de las proteínas.
Objetivo del estudio:
- Para investigar la vía de escape del ligando de monóxido de carbono (CO) de la mioglobina (Mb).
- Para aclarar el papel del xenón (Xe) en la modulación de la dinámica de escape de CO.
- Para identificar sitios específicos de acoplamiento involucrados en la liberación de ligandos.
Principales métodos:
- Se empleó la técnica de rejillado transitorio (TG) para medir los cambios en el volumen molecular.
- Los estudios se realizaron a temperaturas fisiológicas.
- Se aplicaron diferentes presiones de xenón para observar su efecto en las tasas de escape de CO.
Principales resultados:
- La velocidad aparente de escape de CO y la contracción del volumen aumentaron con la presión del xenón.
- Dependencia de la presión correlacionada con la población de xenón en el sitio Xe.
- Se descubrió que el CO se encontraba atrapado en el sitio de Xe(1) antes de escapar al disolvente.
Conclusiones:
- A Xe(1) el sitio de captura influye en el escape de CO de Mb.
- La fotoexcitación libera CO, no Xe atrapado, de MbCO atrapado por Xe.
- Existen dos vías de escape de CO distintas, una dominante y dependiente de Xe1, y otra utilizada cuando Xe bloquea el sitio Xe1.
Más Videos Relacionados
08:31Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
Published on: October 3, 2018
06:12Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
Published on: January 27, 2021
Videos de Conceptos Relacionados
01:20Gas Exchange and Transport
Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
01:14The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
01:28Protein Denaturation
The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
01:27Oxygen Transport in the Blood
Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
01:19Carbon Dioxide Transport in the Blood
Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
01:26Oxygenic Photosynthesis
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...