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Related Concept Videos

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

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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

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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.
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Protein Transport to the Thylakoids01:22

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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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Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

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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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Cell Signaling in Plants

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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Analysis of Protein Import into Chloroplasts Isolated from Stressed Plants
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PDM3, a pentatricopeptide repeat-containing protein, affects chloroplast development.

Jian Zhang1, Jianwei Xiao1, Yuqian Li1

  • 1College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China.

Journal of Experimental Botany
|October 21, 2017
PubMed
Summary

A new study identifies pigment-defective mutant3 (pdm3) in Arabidopsis, a protein crucial for chloroplast development. The pdm3 mutant shows defective thylakoids and altered gene expression, highlighting its essential role in plant growth.

Keywords:
ArabidopsisPigment-Defective Mutant3chloroplastdevelopmentpentatricopeptide repeat proteinplastid-encoded polymerase-dependent

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Chloroplasts are vital for plant photosynthesis and development.
  • The regulatory mechanisms governing chloroplast development are not fully understood.

Purpose of the Study:

  • To characterize the pigment-defective mutant3 (pdm3) in Arabidopsis and elucidate its role in chloroplast development.

Main Methods:

  • Phenotypic analysis of the pdm3 mutant, including electron microscopy.
  • Sequence analysis of the PDM3 gene.
  • Subcellular localization studies using confocal microscopy and immunoblotting.
  • Analysis of chloroplast gene expression and intron splicing.

Main Results:

  • The pdm3 mutant exhibits an albino phenotype, reduced thylakoid structure, and seedling lethality.
  • PDM3 encodes a chloroplast-localized protein with 12 pentratricopeptide repeat domains.
  • Mutant analysis revealed reduced plastid-encoded polymerase-dependent transcripts and increased nuclear-encoded polymerase-dependent transcripts.
  • Intron splicing of specific chloroplast genes (trnA, ndhB, clpP-1) was affected in pdm3.

Conclusions:

  • PDM3 is essential for proper chloroplast development in Arabidopsis.
  • PDM3 likely plays a role in regulating chloroplast gene expression and intron splicing.