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Related Concept Videos

Protein Transport to the Stroma01:24

Protein Transport to the Stroma

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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.
Protein complexes called the translocon of the outer chloroplast membrane or TOC complex, and the translocon of the inner chloroplast membrane or TIC complex mediate the...
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Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

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Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
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Protein Transport to the Inner Chloroplast Membrane01:18

Protein Transport to the Inner Chloroplast Membrane

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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 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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Overview of Protein Sorting and Transport01:45

Overview of Protein Sorting and Transport

16.3K
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.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation.  In gated transport, folded...
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Subcellular Fractionation01:32

Subcellular Fractionation

7.4K
The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...
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Related Experiment Video

Updated: Oct 7, 2025

Plastoglobule Lipid Droplet Isolation from Plant Leaf Tissue and Cyanobacteria
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Liquid-Liquid Phase Separation Phenomenon on Protein Sorting Within Chloroplasts.

Canhui Zheng1, Xiumei Xu1, Lixin Zhang1

  • 1State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China.

Frontiers in Physiology
|January 10, 2022
PubMed
Summary

Liquid-liquid phase separation (LLPS) facilitates the sorting of proteins to the thylakoid lumen via the chloroplast twin arginine transport (cpTAT) pathway in plants. This mechanism is crucial for chloroplast function and plant survival.

Keywords:
STTschloroplastliquid dropletsliquid-liquid phase separationprotein sorting

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Area of Science:

  • Plant Cell Biology
  • Molecular Plant Physiology
  • Organelle Biogenesis

Background:

  • Chloroplasts in higher plants exhibit complex compartmentalization, essential for photosynthesis and survival.
  • Most chloroplast proteins are synthesized in the cytosol and require precise sorting to their correct sub-organelle destinations.
  • Efficient protein targeting is critical for chloroplast functionality and overall plant health.

Purpose of the Study:

  • To review chloroplast protein sorting mechanisms, focusing on the thylakoid lumen.
  • To highlight the role of liquid-liquid phase separation (LLPS) in protein targeting.
  • To emphasize the novel function of LLPS in sorting chloroplast twin arginine transport (cpTAT) pathway substrates.

Main Methods:

  • Review of existing literature on chloroplast protein sorting pathways.
  • Summary of the properties and significance of liquid-liquid phase separation (LLPS).
  • Analysis of studies investigating STT1/2 involvement in cpTAT substrate sorting via LLPS.

Main Results:

  • Nuclear-encoded proteins are imported into the chloroplast stroma and sorted to various compartments.
  • Proteins destined for the thylakoid lumen via the cpTAT pathway are facilitated by STT1/2-driven LLPS.
  • LLPS emerges as a novel mechanism for organizing cellular components and accelerating reactions.

Conclusions:

  • LLPS plays a significant role in the spatial and temporal regulation of cpTAT substrate protein sorting.
  • This mechanism contributes to the formation of membrane-less sub-cellular compartments within chloroplasts.
  • Future research should explore further the intricacies of chloroplast protein sorting and targeting.