Related Experiment Video
Updated: Jul 14, 2026
10:28
Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics
Published on: October 19, 2018
Chloroplast envelope membranes: a dynamic interface between plastids and the cytosol
Maryse A Block1, Roland Douce, Jacques Joyard
1Laboratoire de Physiologie Cellulaire Végétale, institut de Recherches en Technologies et Sciences pour le Vivant, CNRS, Université Joseph Fourier, CEA-Grenoble, 38054 Grenoble-cedex 9, France.
Photosynthesis Research
|June 15, 2007
Summary
The chloroplast envelope, a dynamic membrane system, plays a crucial role in plant cell functions, integrating metabolic networks and regulating gene expression. Its complex lipid and protein composition allows adaptation to environmental changes.
Area of Science:
- Plant Biology
- Cellular Biology
- Biochemistry
Background:
- Chloroplasts possess a unique double membrane envelope, crucial for their function and evolution.
- Plastid envelope membranes are rich in diverse lipids and terpenoids, enabling plant adaptation to environmental stresses like phosphate deprivation.
Purpose of the Study:
- To provide an overview of chloroplast envelope constituents.
- To highlight recent findings on the functions and dynamics of these membranes within plant cells.
Main Methods:
- Proteomic studies targeting envelope membranes.
- Analysis of lipid and terpenoid composition.
- Investigation of transport systems and protein import routes.
Main Results:
- Revealed the unexpected complexity of the chloroplast envelope membrane system.
- Identified novel transport systems for metabolites and ions.
- Discovered new pathways for chloroplast-specific protein import.
Conclusions:
- Chloroplast envelope membranes are key players in plastid biogenesis and coordinated gene expression.
- These membranes act as a central hub for integrating cellular metabolic and ionic networks.
- The envelope is a dynamic system involved in cell division, growth, and interaction with other cellular components.
Related Concept Videos
01:20Plasmodesmata
In a multicellular organism, cells must communicate to work together in a coordinated manner. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...
02:32Plasmodesmata
The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.Intercellular junctions are a feature of fungal, plant, and animal cells alike. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal...
01:18Protein 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...
01:45Mitochondrial Membranes
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
01:45Mitochondrial Membranes
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
01:11Protein 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.
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.