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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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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.
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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.
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Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana
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Changes in envelope permeability during chloroplast development.

R Hampp1, H W Schmidt

  • 1Institut für Botanik und Mikrobiologie, Technische Universität, Arcisstraße 21, D-8000, München 2, Federal Republic of Germany.

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|January 17, 2014
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Summary
This summary is machine-generated.

During plant greening, the permeability of plastid membranes changes significantly. This allows essential metabolite transport in early etio-chloroplast development, crucial for plant growth.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Plastids are vital organelles in plant cells, responsible for photosynthesis and biosynthesis.
  • Understanding plastid envelope permeability is key to comprehending metabolic regulation during development.

Purpose of the Study:

  • To investigate changes in plastid envelope permeability during Avena sativa development.
  • To determine how metabolite transport across the plastid envelope is regulated during greening.

Main Methods:

  • Utilized light scattering techniques to assess plastid envelope properties.
  • Employed uptake studies with various radiolabeled metabolites, including malate, succinate, glutamate, and sucrose.

Main Results:

  • Identified a primary change in plastid envelope permeability during the greening process.
  • Observed increased transport of key metabolites across the membranes in early etio-chloroplast stages.
  • Demonstrated that altered permeability facilitates the uptake of externally synthesized precursors.

Conclusions:

  • Plastid envelope permeability undergoes significant adaptation during plant development.
  • This adaptation is essential for meeting the metabolic demands of developing plastids.
  • The findings provide insights into the dynamic regulation of metabolite transport in plant organelles.