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The Anatomy of Chloroplasts

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...

Anatomy of Chloroplasts

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.

The Z-Scheme of Electron Transport in Photosynthesis

The Z-Scheme of Electron Transport in Photosynthesis

The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...

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...

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...

Photosystems

Photosystems

Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...

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Related Experiment Video

Updated: May 11, 2026

$Studying the Supramolecular Organization of Photosynthetic Membranes within Freeze-fractured Leaf Tissues by Cryo-scanning Electron Microscopy$

Studying the Supramolecular Organization of Photosynthetic Membranes within Freeze-fractured Leaf Tissues by Cryo-scanning Electron Microscopy

Published on: June 23, 2016

FtsZ in chloroplast division: structure, function and evolution.

Allan D TerBush¹, Yamato Yoshida, Katherine W Osteryoung

¹Biochemistry and Molecular Biology Graduate Program, Michigan State University, East Lansing, MI 48824-1319, United States.

Current Opinion in Cell Biology

|May 29, 2013

Summary

Chloroplast division relies on FtsZ proteins, which evolved into two distinct families in plants. Recent studies suggest these FtsZ families cooperate to drive organelle division.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

FtsZ proteins are essential cytoskeletal components for chloroplast division.
They originated from cyanobacterial FtsZ and are conserved in photosynthetic eukaryotes.
Chloroplast division involves two distinct FtsZ families that evolved through gene duplication.

Purpose of the Study:

To investigate the functional cooperation between the two distinct FtsZ families in chloroplast division.
To elucidate the mechanisms driving chloroplast division in land plants.

Main Methods:

Biochemical analysis of FtsZ protein properties.
Dynamic studies of FtsZ polymerization and ring formation.
Comparative studies with bacterial FtsZ systems.

Main Results:

Identified two phylogenetically and structurally distinct FtsZ families in chloroplasts.
Recent studies provide insights into the biochemical and dynamic properties of plant FtsZs.
Evidence suggests cooperation between distinct FtsZ proteins is crucial for division.

Conclusions:

The evolution of two FtsZ families is a distinctive feature of chloroplast division.
Understanding FtsZ cooperation is key to deciphering chloroplast division mechanisms.
Further research on FtsZ dynamics and interactions will illuminate organelle division.