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Protein Transport to the Outer Chloroplast Membrane

Protein Transport to the Outer Chloroplast Membrane

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.

Protein Transport to the Stroma

Protein Transport to the Stroma

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...

Protein Transport to the Thylakoids

Protein Transport to the Thylakoids

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...

Protein Transport to the Inner Chloroplast Membrane

Protein Transport to the Inner Chloroplast Membrane

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...

Overview of Protein Sorting and Transport

Overview of Protein Sorting and Transport

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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Related Experiment Video

Updated: Dec 30, 2025

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics

Published on: October 19, 2018

An Overview on Predicting Protein Subchloroplast Localization by using Machine Learning Methods.

Meng-Lu Liu¹, Wei Su¹, Zheng-Xing Guan¹

¹Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology and Center for Informational Biology, University of Electronic Science and Technology of China, Chengdu 610054, China.

Current Protein & Peptide Science

|January 21, 2020

Summary

This summary is machine-generated.

Predicting protein subchloroplast localization is crucial for understanding plant and algal functions. This review covers twelve computational methods developed over ten years to efficiently identify these protein locations, aiding future research.

Keywords:

Protein dataset feature selection machine learning method protein sequence properties subchloroplast localization

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Last Updated: Dec 30, 2025

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics

Published on: October 19, 2018

Studying Protein Import into Chloroplasts Using Protoplasts

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Published on: December 10, 2018

Identification of Plasmodesmal Localization Sequences in Proteins In Planta

Identification of Plasmodesmal Localization Sequences in Proteins In Planta

Published on: August 15, 2017

Area of Science:

Plant Biology
Molecular Biology
Biochemistry

Background:

Chloroplasts are vital organelles in green plants and algae, essential for photosynthesis.
Protein function is intrinsically linked to its subcellular location within the chloroplast.
Experimental determination of protein subchloroplast localization is resource-intensive.

Purpose of the Study:

To review and summarize computational methods for predicting protein subchloroplast localization.
To provide an overview of the progress in computational prediction of protein localization within chloroplasts.
To guide future research in computational studies of protein subchloroplast localization.

Main Methods:

Review of twelve computational prediction methods developed in the last decade.
Analysis of research progress in the field of protein subchloroplast localization prediction.
Synthesis of information on existing computational tools and approaches.

Main Results:

Twelve distinct computational methods for predicting protein subchloroplast localization have been developed.
Significant advancements have been made in computational approaches over the past ten years.
These methods offer alternatives to costly and time-consuming experimental techniques.

Conclusions:

Computational prediction is a valuable tool for determining protein subchloroplast localization.
The reviewed methods provide a foundation for future development in the field.
This review serves as a guide for researchers investigating protein functions within chloroplasts.