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Short-distance Transport of Resources02:12

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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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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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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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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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
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Studying Cargo Transport Using RudLOV.

Tatsuya Tago1, Takunori Satoh1, Akiko K Satoh1

  • 1Graduate School of Integrated Sciences for Life, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan.

Bio-Protocol
|October 27, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed RudLOV, a novel optical method for precisely controlling intracellular cargo transport. This technique allows for synchronized release of proteins, aiding the study of endoplasmic reticulum to Golgi apparatus pathways.

Keywords:
Confocal microscopyER–Golgi cargo transportIntracellular cargo transportLive imagingOptogeneticsRudLOV

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • Intracellular transport of membrane and secreted proteins from the endoplasmic reticulum (ER) to the Golgi apparatus is crucial for cell function.
  • The precise mechanisms governing this transport and cargo sorting are not fully understood.
  • Advancements in optical microscopy and synchronized cargo release methods are enabling direct observation of protein transport.

Purpose of the Study:

  • To introduce and detail a new optically synchronized method for controlling intracellular cargo release, named retention using the dark state of LOV2 (RudLOV).
  • To enable precise spatial, temporal, and quantitative control over cargo release for studying intracellular transport.
  • To provide a detailed protocol for high-resolution live imaging of intracellular cargo transport using the RudLOV technique.

Main Methods:

  • Development of the RudLOV (retention using the dark state of LOV2) method for optically synchronized cargo release.
  • Utilizing illumination to trigger and detect cargo transport.
  • Employing specific laser wavelengths (445 or 488 nm) for cargo release with reduced photodamage compared to UV.
  • Implementing a protocol for high-resolution live imaging of intracellular protein transport.

Main Results:

  • RudLOV provides precise spatial, temporal, and quantitative control over the release of cargo proteins.
  • The method allows for cargo release using visible light lasers (445 or 488 nm), minimizing cellular damage.
  • RudLOV enables the controlled hooking and release of cargo without the need for exogenous chemicals.
  • Successful application of RudLOV facilitates high-resolution live imaging of intracellular transport dynamics.

Conclusions:

  • RudLOV is a powerful new tool for optically controlling and observing intracellular cargo transport.
  • This method enhances the precision and reduces photodamage in live imaging studies of protein trafficking.
  • RudLOV offers significant advantages for investigating the complex mechanisms of ER-to-Golgi transport and cargo sorting.