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Related Concept Videos

Protein Transport to the Thylakoids01:22

Protein Transport to the Thylakoids

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Thylakoids are membrane-bound sac-like structures within the chloroplast that serve as sites for photosynthesis. Thylakoid lumen contains many electron transport proteins and is enclosed by a thylakoid membrane rich in the light-harvesting complex. Proteins targeted to the thylakoids are transported as precursors and are sorted by the general TOC/TIC import pathway. Once the precursor reaches the stroma, stromal processing peptidases remove their transit signal and expose thylakoid signal...
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Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
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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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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
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Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Axonal Transport of Organelles in Motor Neuron Cultures using Microfluidic Chambers System
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Visualization of Intra-neuronal Motor Protein Transport through Upconversion Microscopy.

Xiao Zeng1, Shuo Chen2, Adam Weitemier2

  • 1Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.

Angewandte Chemie (International Ed. in English)
|May 16, 2019
PubMed
Summary

This study introduces a novel dynamic imaging technique using upconversion nanoparticles to track motor protein movement in neurons. This advancement enables real-time, high-resolution visualization of axonal transport, aiding neurodegenerative disease research.

Keywords:
axon transportdyneinsingle-particle resolutionupconversion microscopywide-field illumination

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Area of Science:

  • Neuroscience
  • Biophysics
  • Nanotechnology

Background:

  • Axonal transport is crucial for neuronal function, relying on motor proteins.
  • Current imaging methods lack the spatiotemporal resolution for real-time motor protein tracking.
  • Visualizing intra-axonal transport is vital for understanding neuronal health and disease.

Purpose of the Study:

  • To develop a robust dynamic imaging technique for visualizing and quantifying axonal transport.
  • To enable real-time, high-resolution tracking of motor proteins in neurons.
  • To provide a tool for studying neurodegenerative diseases linked to axonal transport dysfunction.

Main Methods:

  • Utilized upconversion nanoparticles as microscopic probes.
  • Developed a dynamic imaging technique exploiting nanoparticle characteristics.
  • Applied the technique for quantitative in situ tracking of retrograde transport in neurons.

Main Results:

  • Achieved single-particle resolution for tracking motor protein movement.
  • Enabled real-time visualization of axonal transport in multilayered neuronal cultures.
  • Demonstrated the technique's capability for quantitative analysis of neuronal transport.

Conclusions:

  • The presented dynamic imaging technique offers a powerful tool for neuroscience research.
  • This method advances the study of neuronal function, intra-axonal transport, and associated diseases.
  • The technique facilitates detailed investigation into neurodegenerative conditions stemming from axonal transport impairments.