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Related Concept Videos

Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Translocation of Proteins into the Mitochondria01:19

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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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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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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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RNA Stability

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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Area of Science:

  • Structural Biology
  • Biotechnology
  • Molecular Biology

Background:

  • Ribonucleic acids (RNAs) are crucial for cellular biology but challenging to study structurally due to their dynamic nature.
  • Understanding RNA higher-order structures (HOSs) is key to unlocking their functions and biotechnological potential.
  • Existing methods struggle to capture the biologically relevant structures of dynamic RNA molecules.

Purpose of the Study:

  • To develop and evaluate native ion mobility-mass spectrometry and collision-induced unfolding (CIU) for RNA structural characterization.
  • To assess the ability of these techniques to preserve native RNA structural features in the gas phase.
  • To apply these methods to investigate the impact of the A3243G mutation on RNA structure and function.

Main Methods:

  • Native ion mobility-mass spectrometry coupled with collision-induced unfolding (CIU).
  • Structural characterization of diverse functional RNAs.
  • Analysis of gas-phase RNA ions and their stability.

Main Results:

  • Experimentally determined conditions preserve solution-state RNA structural memory.
  • CIU fingerprints and RNA HOS show correlated complexity.
  • Observed predicted stability shifts and magnesium binding events in gas-phase RNA ions.
  • Significant differences in collision cross section and stability linked to the A3243G mutation in mitochondrial tRNA maturation.

Conclusions:

  • Native ion mobility-mass spectrometry and CIU are effective for RNA structural characterization.
  • These methods can reveal structural changes associated with specific mutations, like the A3243G mutation.
  • CIU holds promise for developing RNA-based biotherapeutics and advancing transcriptomic characterization.