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ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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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.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
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Primary Active Transport01:29

Primary Active Transport

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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ATP Driven Pumps II: P-type Pumps01:34

ATP Driven Pumps II: P-type Pumps

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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 I: An Overview01:27

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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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Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Active Transport01:14

Active Transport

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Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
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Una bomba de aniones moleculares

Baihao Shao1, Heyifei Fu1, Ivan Aprahamian1

  • 1Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.

Science (New York, N.Y.)
|August 1, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo receptor artificial que utiliza la energía de la luz para bombear iones de cloruro contra su gradiente de concentración, imitando a los transportadores biológicos. Esta bomba molecular ofrece un control preciso sobre la captura y liberación de iones para aplicaciones potenciales en sistemas biológicos artificiales.

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Área de la Ciencia:

  • Química supramolecular
  • Fotosíntesis artificial
  • Transporte de iones

Sus antecedentes:

  • Los transportadores basados en proteínas son cruciales para los procesos biológicos, moviendo iones contra gradientes de concentración.
  • El desarrollo de receptores artificiales que imiten esta función es un desafío debido a la necesidad de unión y liberación controladas.
  • Los sistemas artificiales existentes a menudo luchan por equilibrar la alta afinidad con el transporte de iones bajo demanda.

Objetivo del estudio:

  • Diseñar y sintetizar un nuevo receptor artificial capaz de transportar iones activos.
  • Utilización de la energía luminosa para impulsar el transporte de aniones cloruro contra un gradiente de concentración.
  • Para lograr un control preciso y bajo demanda sobre la captura y liberación de iones utilizando un sistema con conmutación fotográfica.

Principales métodos:

  • Síntesis de un receptor basado en un interruptor fotográfico de hidrazona trímero.
  • Utilizando una membrana líquida de diclorometano para experimentos de transporte de iones.
  • Empleando energía luminosa para activar el mecanismo de la bomba molecular.

Principales resultados:

  • El receptor desarrollado funciona con éxito como una bomba molecular, transportando aniones de cloruro contra un gradiente.
  • El sistema exhibe facilidad de síntesis, bistabilidad y excelentes propiedades de conmutación fotográfica.
  • Se han demostrado excelentes propiedades de unión ON-OFF para los aniones cloruro, con una diferencia de unión de hasta seis órdenes de magnitud.

Conclusiones:

  • Se ha creado con éxito una nueva bomba molecular fotointercambiable capaz de transportar iones activos.
  • El receptor convierte eficientemente la energía de la luz en trabajo mecánico para la translocación de iones.
  • Este sistema ofrece una plataforma prometedora para el transporte de iones artificiales con alto control y eficiencia.