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Related Concept Videos

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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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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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...
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The Anatomy of Chloroplasts01:08

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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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Protein Transport to the Inner Chloroplast Membrane01:18

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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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Updated: Feb 12, 2026

Studying Protein Import into Chloroplasts Using Protoplasts
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Rubisco Assembly in the Chloroplast.

Anna Vitlin Gruber1, Leila Feiz2

  • 1Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, United States.

Frontiers in Molecular Biosciences
|March 30, 2018
PubMed
Summary

Engineering more efficient Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) requires understanding its complex assembly. Key chloroplast chaperones and auxiliary factors like Raf1, Raf2, and Bsd2 are crucial for plant Rubisco biogenesis.

Keywords:
Rubiscoassemblychaperonechaperoninchloroplastfolding

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Area of Science:

  • Plant molecular biology
  • Biochemistry
  • Enzyme kinetics

Background:

  • Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is essential for carbon fixation via the Calvin-Benson cycle.
  • Its slow catalytic rate necessitates high enzyme levels, driving research into improving efficiency.
  • Form I Rubisco, a plant enzyme, has a complex hexadecameric structure (8 large RbcL, 8 small RbcS subunits).

Purpose of the Study:

  • To review the unique requirements for plant Rubisco folding and assembly.
  • To discuss the roles of chloroplast chaperonins (Cpn60-Cpn20) and auxiliary factors (Raf1, Raf2, Bsd2) in Rubisco biogenesis.
  • To highlight insights gained from expressing Arabidopsis Rubisco in E. coli.

Main Methods:

  • Review of existing literature on Rubisco biogenesis.
  • Analysis of studies involving chloroplast chaperones and assembly factors.
  • Examination of heterologous expression systems for Rubisco assembly.

Main Results:

  • Plant Rubisco assembly is distinct from bacterial systems, requiring specific chloroplast chaperonins and auxiliary factors.
  • Factors like Raf1, Raf2, and Bsd2 play sequential or concurrent roles in RbcL folding and holoenzyme formation.
  • Expression in E. coli revealed potential functions for Raf1, RbcX, Bsd2, and Raf2 in specific assembly stages.

Conclusions:

  • Understanding the precise functions and interactions of Rubisco assembly factors is critical.
  • Further characterization of these factors will enable engineering of more efficient plants for increased biomass.
  • This research has implications for improving crop yields, biofuels, and sustenance.