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Related Concept Videos

The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A...
Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes

The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.
Protein Transport to the Stroma01:24

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 Outer Chloroplast Membrane01:11

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 Thylakoids01:22

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...

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Related Experiment Video

Updated: Jun 23, 2026

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics
10:28

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

Published on: October 19, 2018

Challenges to our current view on chloroplasts.

Ralf Reski1

  • 1Plant Biotechnology, Faculty of Biology, University of Freiburg, Schänzlestr. 1, D-79104 Freiburg, Germany. Ralf.Reski@biologie.uni-freiburg.de

Biological Chemistry
|May 21, 2009
PubMed
Summary
This summary is machine-generated.

Chloroplasts evolved from three genetic compartments. This review explores diverse bacteria and eukaryotes, revealing dynamic chloroplast structures and variations within Archaeplastida, supporting an evolutionary cell biology perspective.

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Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana
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Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana

Published on: July 14, 2021

Studying Protein Import into Chloroplasts Using Protoplasts
06:29

Studying Protein Import into Chloroplasts Using Protoplasts

Published on: December 10, 2018

Related Experiment Videos

Last Updated: Jun 23, 2026

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics
10:28

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

Published on: October 19, 2018

Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana
07:45

Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana

Published on: July 14, 2021

Studying Protein Import into Chloroplasts Using Protoplasts
06:29

Studying Protein Import into Chloroplasts Using Protoplasts

Published on: December 10, 2018

Area of Science:

  • Plant Biology
  • Cell Biology
  • Evolutionary Biology

Background:

  • Chloroplasts are key organelles in eukaryotic photosynthesis.
  • Their origin involves the integration of multiple genetic components.
  • Existing models may not fully capture their structural diversity.

Purpose of the Study:

  • To review current research on chloroplast structure.
  • To highlight structural dynamics and variations in photosynthetically active organisms.
  • To propose an evolutionary framework for bacterial and plastid cell biology.

Main Methods:

  • Literature review of studies on bacteria and eukaryotes.
  • Compilation of data on chloroplast structure and evolution.
  • Analysis of structural differences across Archaeplastida groups.

Main Results:

  • Identified diverse bacterial and eukaryotic forms challenging current views.
  • Highlighted the structurally dynamic nature of chloroplasts.
  • Documented significant differences in chloroplast structure among Archaeplastida.

Conclusions:

  • Chloroplasts exhibit greater structural diversity than previously recognized.
  • An evolutionary perspective is crucial for understanding bacterial and plastid cell biology.
  • Further research is needed to refine models of chloroplast origin and evolution.