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Related Concept Videos

Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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Protein Transport into the Inner Mitochondrial Membrane01:34

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondrial Precursor Proteins01:39

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Protein Import into the Peroxisomes01:27

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Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
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Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Isolation of mRNAs Associated with Yeast Mitochondria to Study Mechanisms of Localized Translation
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Mitochondria-targeted RNA import.

Geng Wang1, Eriko Shimada, Mahta Nili

  • 1School of Life Sciences, Tsinghua University, Beijing, 100084, China.

Methods in Molecular Biology (Clifton, N.J.)
|January 30, 2015
PubMed
Summary
This summary is machine-generated.

Researchers describe in vitro and in vivo import assay systems to study nucleus-encoded mitochondrial RNAs. These systems help confirm RNA localization and understand their functions within the mitochondrion.

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Area of Science:

  • Mitochondrial biology
  • Molecular genetics
  • RNA biology

Background:

  • Nucleus-encoded RNAs are imported into mitochondria across species.
  • High-throughput sequencing reveals more nucleus-encoded mitochondrial RNAs.
  • Understanding the function of these RNAs requires confirmation of their mitochondrial localization.

Purpose of the Study:

  • To describe in vitro and in vivo import assay systems.
  • To facilitate the study of mitochondrial RNA import, processing, and functions.
  • To aid in confirming the mitochondrial localization of various candidate RNAs.

Main Methods:

  • Development and description of in vitro import assays.
  • Development and description of in vivo import assays.
  • Utilizing these systems to study candidate RNAs like small noncoding RNAs, miRNAs, tRNAs, lncRNAs, and viral RNAs.

Main Results:

  • The described systems enable the study of mitochondrial RNA import.
  • These assays assist in confirming the mitochondrial localization of nucleus-encoded RNAs.
  • The systems provide a framework for investigating RNA processing and function within mitochondria.

Conclusions:

  • In vitro and in vivo import assay systems are valuable tools for mitochondrial RNA research.
  • These systems are crucial for validating the presence and function of nucleus-encoded RNAs in mitochondria.
  • Further research into mitochondrial RNA biology can be advanced using these described methodologies.