Mitochondrial Translation
Mitochondrial Translation - Related Videos
02:59
Animal Mitochondrial Genetics
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2020
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
02:19
Export of Mitochondrial and Chloroplast Genes
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2020
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 irrespective...
08:43
Simultaneous Measurement of Mitochondrial Calcium and Mitochondrial Membrane Potential in Live Cells by Fluorescent Microscopy
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Cited by 29 •
2017
Mitochondria can utilize the electrochemical potential across their inner membrane (ΔΨm) to sequester calcium (Ca2+), allowing them to shape cytosolic Ca2+ signaling within the cell. We describe a method for simultaneously measuring mitochondria Ca2+ uptake and ΔΨm in live cells using fluorescent dyes and confocal microscopy.
09:53
Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly
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Cited by 2 •
2024
This work explains how to transform yeast mitochondria using a biolistic method. We also show how to select and purify the transformants and how to introduce the desired mutation in the target position within the mitochondrial genome.
02:33
Initiation of Translation
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2020
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs. First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
FAQs
Several coordinated components make decoding and chain extension possible. Mitochondrial messenger RNAs provide the sequence information, while transfer RNAs carry amino acids and aminoacyl-tRNA synthetases attach the correct amino acid to each tRNA. Initiation and elongation factors support distinct stages, and GTP-dependent steps help drive the progression from message decoding toward polypeptide formation.
The mitochondrial genetic code can differ from the nuclear genetic code, so a codon may not carry the same meaning in both cellular systems. This difference directly affects how mitochondrial messenger RNAs are decoded by mitochondrial ribosomes. Interpreting mitochondrial translation therefore requires considering the genetic code used by the organelle rather than assuming the nuclear code applies unchanged.
GTP-dependent steps provide part of the regulated progression through mitochondrial protein synthesis. They are associated with the actions of initiation and elongation factors, which help organize the stages that begin decoding and extend the growing polypeptide. Their involvement links nucleotide-dependent molecular events with the controlled assembly of proteins required for respiratory-chain function.
Mitochondrial translation produces proteins that are inserted into the inner mitochondrial membrane, where they become components of respiratory-chain complexes. This destination is functionally important because those complexes support cellular energy metabolism. Consequently, successful synthesis alone is not sufficient; the resulting polypeptides must also reach the membrane-associated systems in which their roles are realized.
A useful pathway-level analysis follows the process from mitochondrial DNA-derived messenger RNA, through ribosome-mediated decoding and amino acid assembly, to insertion of the completed proteins into respiratory-chain complexes. Tracking these stages helps connect molecular events with their biochemical outcome. It also provides a framework for identifying where altered decoding, assembly, or protein delivery could disrupt energy metabolism.
Mitochondrial translation is relevant because it supplies proteins needed for oxidative phosphorylation and cellular energy metabolism. Defects in this pathway can therefore impair the production or assembly of respiratory-chain components, linking a problem in protein synthesis with reduced energy-related function. Studying these connections helps researchers interpret how molecular translation defects contribute to mitochondrial disease and metabolic dysfunction.
Antibiotic effects can be examined in relation to the specialized machinery that carries out protein synthesis inside mitochondria. Because mitochondrial translation uses its own ribosomes, messenger RNAs, transfer RNAs, synthetases, and translation factors, changes affecting this pathway may influence production of respiratory-chain proteins. This provides a biochemical context for studying how antibiotic exposure relates to mitochondrial function and energy metabolism.