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Related Concept Videos

Membrane Transporters01:31

Membrane Transporters

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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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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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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
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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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ABC Transporters: Importer01:27

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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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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles
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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles

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An Artificial Molecular Transporter.

Christian Schäfer1, Giulio Ragazzon1, Benoit Colasson1

  • 1Photochemical Nanosciences Laboratory Dipartimento di Chimica "G. Ciamician" Alma Mater Studiorum-Università di Bologna via Selmi 2 40126 Bologna Italy.

Chemistryopen
|June 17, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a synthetic molecular shuttle capable of controlled cargo transport. This acid-base controlled rotaxane system can reversibly bind and release molecular loads, mimicking biomolecular machines.

Keywords:
molecular machinesmolecular shuttlesnanosciencephotochemistryrotaxane

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Area of Science:

  • Supramolecular Chemistry
  • Nanotechnology
  • Synthetic Chemistry

Background:

  • Biomolecular machines perform essential substrate transport in living organisms.
  • Developing synthetic systems to mimic these functions is a key challenge in nanotechnology.

Purpose of the Study:

  • To design and demonstrate a synthetic small-molecule system for controlled molecular cargo transport in solution.
  • To create an artificial molecular shuttle controlled by external stimuli.

Main Methods:

  • Utilized a bistable rotaxane as a molecular shuttle.
  • Incorporated a tether with a nitrile group on the rotaxane's ring.
  • Employed a ruthenium complex as the molecular cargo, coordinated via the nitrile group.
  • Controlled cargo binding and release using acid-base conditions and visible light irradiation.

Main Results:

  • The synthetic rotaxane system successfully captured, displaced, and released molecular cargo (ruthenium complex).
  • Cargo loading/unloading and shuttle ring transfer/return were demonstrated as reversible processes.
  • Independent control over cargo binding/release and shuttle movement was achieved.
  • A robust coordination bond ensured cargo stability during transport.

Conclusions:

  • A controllable synthetic molecular shuttle system has been successfully engineered.
  • The system demonstrates reversible and independently controllable cargo transport, mimicking biomolecular machines.
  • This work provides a foundation for developing advanced artificial molecular devices for nanoscale applications.