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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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Protein Transport to the Stroma01:24

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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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Secondary Active Transport01:55

Secondary Active Transport

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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Overview of Protein Sorting and Transport01:45

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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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Protein Transport to the Inner Chloroplast Membrane01:18

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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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Protein Transport into the Inner Mitochondrial Membrane01:34

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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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Updated: Feb 13, 2026

Preparation of Rat Sciatic Nerve for Ex Vivo Neurophysiology
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Preparation of Rat Sciatic Nerve for Ex Vivo Neurophysiology

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Are axonally transported proteins released from sciatic nerves?

B Tedeschi, D L Wilson, A Zimmerman

    Brain Research
    |April 27, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study found no significant release of axonally transported proteins from frog sciatic nerves. Previous claims of protein release were not replicated under stricter controls for non-axonal sources.

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    Area of Science:

    • Neuroscience
    • Cell Biology

    Background:

    • Axonally transported proteins are crucial for neuronal function and maintenance.
    • Previous research suggested these proteins can be released from nerve tissue into the extracellular environment.

    Purpose of the Study:

    • To investigate the release of axonally transported proteins from frog sciatic nerves.
    • To validate or refute previous claims of significant protein release from nerve tissue.

    Main Methods:

    • Utilized frog sciatic nerves for experimental analysis.
    • Implemented stringent controls to differentiate between axonal and non-axonal sources of released proteins.
    • Quantified protein release into the surrounding solution.

    Main Results:

    • No significant release of axonally transported proteins was detected from frog sciatic nerves.
    • The stringent controls effectively minimized contamination from non-axonal protein sources.
    • Findings contradict previous reports of substantial protein release.

    Conclusions:

    • The release of axonally transported proteins from frog sciatic nerves into the surrounding solution is not significant under controlled conditions.
    • Previous findings may have been influenced by non-axonal protein sources.
    • Further research is needed to understand protein transport and potential release mechanisms in neuronal tissue.