Video Experimental Relacionado
Updated: Sep 9, 2025
11:03
Measurement of Fatty Acid β-Oxidation in a Suspension of Freshly Isolated Mouse Hepatocytes
Published on: September 9, 2021
4.0K
Papel de la cetosintasa mitocondrial humana en la biosíntesis de ácidos grasos de cadena larga
Yixing Suo1, Ziran Jiang1, Graham W Heberlig1
1Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92037-0358, United States.
Journal of the American Chemical Society
|September 2, 2025
Resumen
La cetosintasa mitocondrial humana (OXSM) puede alargar los ácidos grasos más allá de los ocho carbonos, desafiando las suposiciones anteriores. Este estudio revela detalles moleculares de las interacciones OXSM-mACP y la selectividad del sustrato.
Área de la Ciencia:
- La bioquímica
- Biología molecular
- El metabolismo humano
Sus antecedentes:
- La función de la cetosintasa mitocondrial humana (OXSM) no se entiende completamente.
- La síntesis de ácidos grasos mitocondriales puede extenderse más allá de la producción de octanoatos.
Objetivo del estudio:
- Caracterizar el OXSM humano y su papel en la biosíntesis de ácidos grasos mitocondriales.
- Para aclarar los mecanismos moleculares del alargamiento de los ácidos grasos mediado por OXSM.
Principales métodos:
- Enlace cruzado covalente para capturar las interacciones OXSM-mACP.
- Cristalografía de alta resolución para determinar estructuras complejas.
- Ensayos de mutagénesis y actividad dirigidos al sitio.
Principales resultados:
- Determinación de las estructuras cristalinas de OXSM unidas a mACP, revelando cambios de conformación.
- Se han identificado las principales interacciones proteína-proteína y proteína-sustrato que regulan la elongación.
- Se observó un mecanismo de enlace conservado y una selectividad detallada del sustrato OXSM.
Conclusiones:
- El OXSM humano puede alargar los ácidos grasos a longitudes superiores a ocho carbonos.
- El mecanismo de OXSM refleja las cetosintasas bacterianas de tipo II.
- Proporciona información sobre el metabolismo de los ácidos grasos mitocondriales y la función OXSM.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:28Overview of Fatty Acid Metabolism
31.7K
Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
31.7K
01:48ATP Synthase: Mechanism
15.1K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
15.1K
01:15Pyruvate Oxidation
161.1K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
161.1K
01:26Respiration Pathways
161
Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
161
01:12Porin Insertion in the Outer Mitochondrial Membrane
3.3K
Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
3.3K
01:28The Inner Mitochondrial Membrane
3.6K
The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
3.6K