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Related Concept Videos

The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

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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...
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Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

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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.
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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 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 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 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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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

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Automatic Chloroplast Movement Analysis.

Henrik Johansson1,2, Mathias Zeidler3

  • 1Department of Plant Physiology, Justus Liebig University, Giessen, Germany. a.h.johansson@fu-berlin.de.

Methods in Molecular Biology (Clifton, N.J.)
|February 13, 2016
PubMed
Summary
This summary is machine-generated.

Plants move chloroplasts within leaf cells to optimize light absorption or prevent damage. This study presents a new method using a microplate reader to quantify chloroplast movement by measuring leaf light transmittance changes.

Keywords:
ArabidopsisChloroplast movementsMicroplate readerPhototropin

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Area of Science:

  • Plant biology
  • Photobiology
  • Cellular physiology

Background:

  • Chloroplasts in plant mesophyll cells exhibit movement in response to varying light intensities.
  • This chloroplast movement, known as phototaxis, is crucial for optimizing light harvesting and preventing photodamage.
  • The process is regulated by blue light photoreceptors, specifically phototropin 1 (phot1) and phototropin 2 (phot2).

Purpose of the Study:

  • To develop and validate a novel, indirect method for quantifying chloroplast movement within plant leaves.
  • To leverage changes in leaf light transmittance as a measurable indicator of chloroplast redistribution.
  • To provide a high-throughput and time-efficient technique for studying chloroplast phototaxis.

Main Methods:

  • Utilizing a microplate reader to measure changes in leaf transmittance.
  • Indirectly assessing chloroplast accumulation and avoidance by monitoring light transmission.
  • Applying the method to multiple samples for quantitative analysis over time.

Main Results:

  • The developed method successfully quantifies chloroplast movement by detecting alterations in leaf light transmittance.
  • The technique allows for monitoring chloroplast accumulation (low light) and avoidance (high light) responses.
  • Quantitative measurements can be obtained with reduced hands-on time compared to traditional methods.

Conclusions:

  • This microplate reader-based method offers an efficient and quantitative approach to study chloroplast movement.
  • The technique facilitates a better understanding of how plants regulate light exposure at the cellular level.
  • This method has potential applications in plant physiology research and crop improvement strategies.