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Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
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Facilitated Diffusion01:16

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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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.
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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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Author Spotlight: Expression and Purification of Human Solute Carrier Transporters Using Codon-Optimized Genes
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Author Spotlight: Expression and Purification of Human Solute Carrier Transporters Using Codon-Optimized Genes

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Se revelan los transportistas

Jyh-Yeuan Lee1, Daniel M Rosenbaum2

  • 1Eugene McDermott Center for Human Growth and Development, The University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.

Cell
|March 12, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Los conocimientos estructurales sobre los transportadores de la subfamilia C de cassette de unión al ATP (ABCC) revelan los mecanismos detrás de sus diversas funciones en la resistencia a los medicamentos y el transporte de iones. Las estructuras cryo-EM iluminan el funcionamiento de estos transportadores.

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Área de la Ciencia:

  • La bioquímica
  • Biología estructural
  • Biología molecular

Sus antecedentes:

  • Los transportadores de casete de unión de ATP (ABC) son proteínas de membrana cruciales involucradas en varios procesos celulares.
  • La subfamilia ABC C (ABCC) está implicada en la resistencia a múltiples fármacos y la regulación del canal iónico.
  • Comprender la estructura del transportador ABCC es clave para descifrar sus diversas funciones fisiológicas.

Objetivo del estudio:

  • Aclarar las bases estructurales de la diversidad funcional de los transportadores ABCC.
  • Para proporcionar estructuras de resolución atómicas o casi atómicas de los transportadores ABCC clave.
  • Para correlacionar las características estructurales con las funciones conocidas de los transportadores ABCC.

Principales métodos:

  • Se empleó la criomicroscopia electrónica de una sola partícula (crio-EM).
  • Se determinaron estructuras de alta resolución para tres transportadores ABCC significativos: MRP1, SUR1 y CFTR.
  • Se analizaron datos estructurales para identificar dominios funcionales clave y estados conformacionales.

Principales resultados:

  • Se obtuvieron estructuras de resolución atómica o casi atómica de MRP1, SUR1 y CFTR.
  • Se revelaron características estructurales detalladas que explican las diversas funciones de estos transportadores ABCC.
  • Los hallazgos proporcionan un marco estructural para la comprensión de los mecanismos de transporte ABCC.

Conclusiones:

  • Las estructuras cryo-EM ofrecen una visión sin precedentes de la función del transportador ABCC.
  • La diversidad estructural se correlaciona directamente con las diversas funciones fisiológicas de los transportadores ABCC.
  • Estos hallazgos avanzan en la comprensión de la resistencia a múltiples fármacos y los mecanismos de transporte de iones.