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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.
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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.
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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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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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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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High-Throughput Metabolic Profiling for Model Refinements of Microalgae
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Putative model based on iTRAQ proteomics for Spirulina morphogenesis mechanisms.

Fu-Shuang Wang1, Shi-Rui Dong1, Hong-Yu Zhang1

  • 1Tianjin Key Laboratory of Food Biotechnology, College of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China.

Journal of Proteomics
|March 28, 2017
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Summary
This summary is machine-generated.

Spirulina morphogenesis is influenced by external factors. Proteomic analysis revealed key metabolic pathways like photosynthesis and carbon fixation are involved in Spirulina

Keywords:
MorphogenesisProteomicsPutative modelSpirulina

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Area of Science:

  • Microbiology
  • Biochemistry
  • Proteomics

Background:

  • Spirulina morphology is sensitive to environmental changes during cultivation.
  • The underlying mechanisms of Spirulina morphogenesis remain largely unknown.

Purpose of the Study:

  • To comparatively investigate proteomic changes between linear and spiral Spirulina.
  • To elucidate the molecular mechanisms governing Spirulina morphogenesis.

Main Methods:

  • Isobaric tag for relative and absolute quantitation (iTRAQ) was employed for proteomic analysis.
  • Gene ontology and metabolic pathway analyses were performed on differentially expressed proteins.
  • Quantitative real-time PCR (qRT-PCR) was used to validate key findings.

Main Results:

  • Significant differences in protein expression were identified between Spirulina morphotypes (165 and 167 proteins).
  • Enriched metabolic pathways included photosynthesis, carbon fixation, and sugar metabolism.
  • These pathways are strongly correlated with Spirulina morphogenesis.

Conclusions:

  • Multiple interacting metabolic pathways are integral to Spirulina morphogenesis.
  • A putative model for Spirulina morphogenesis mechanism has been proposed.