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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
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ATP Driven Pumps II: P-type Pumps01:34

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
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ATP Driven Pumps III: V-type Pumps01:30

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Bombas y motores moleculares

Yuanning Feng1, Marco Ovalle1, James S W Seale1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|April 8, 2021
PubMed
Resumen
Este resumen es generado por máquina.

Los químicos están diseñando máquinas moleculares artificiales, inspiradas en las bombas y motores de la naturaleza. Estas máquinas novedosas aprovechan la energía para controlar el movimiento molecular lejos del equilibrio, permitiendo nuevas posibilidades sintéticas.

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Área de la Ciencia:

  • Química
  • Ingeniería molecular
  • La biofísica

Sus antecedentes:

  • Las bombas y motores son fundamentales tanto para los sistemas biológicos como para las aplicaciones industriales.
  • La naturaleza utiliza bombas y motores moleculares para los procesos vitales esenciales.
  • Los avances recientes permiten a los químicos diseñar y construir máquinas moleculares artificiales.

Objetivo del estudio:

  • Revisar la historia y las innovaciones en el diseño de máquinas moleculares artificiales.
  • Para resaltar la conexión entre la maquinaria molecular natural y artificial.
  • Para explicar los principios que permiten la ingeniería del movimiento molecular.

Principales métodos:

  • Utilizando una química sin equilibrio controlada cinéticamente.
  • Aplicando la termodinámica de la trayectoria y el principio de la reversibilidad microscópica.
  • Diseñar moléculas con asimetría cinética para diseñar paisajes potenciales.

Principales resultados:

  • Logró un control sin precedentes sobre el movimiento relativo de los componentes moleculares.
  • Desarrolló máquinas moleculares artificiales que imitan bombas y motores naturales.
  • Permitió la formación y el mantenimiento de geometrías moleculares no equilibradas.

Conclusiones:

  • Las máquinas moleculares artificiales ofrecen un control preciso sobre el movimiento molecular.
  • Aprovechar la energía y la asimetría cinética son claves para diseñar máquinas moleculares.
  • Este campo abre nuevas vías para el diseño y la síntesis molecular más allá de los métodos tradicionales.