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ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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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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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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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...
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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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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Learning from Yeast about Mitochondrial Carriers.

Marek Mentel1, Petra Chovančíková1, Igor Zeman1

  • 1Department of Biochemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina CH-1, Ilkovičova 6, 842 15 Bratislava, Slovakia.

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Yeast Saccharomyces cerevisiae models mitochondrial carriers, crucial for cell metabolism. Studying these carriers in yeast helps understand their role in human diseases.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Genetics

Background:

  • Mitochondria are vital organelles for cellular energy and synthesis.
  • Mitochondrial carrier proteins regulate metabolite transport across the inner mitochondrial membrane.
  • Defects in these carriers are linked to various human diseases.

Purpose of the Study:

  • To review the advantages of using yeast Saccharomyces cerevisiae to study mitochondrial carriers.
  • To highlight the role of yeast as a model organism for investigating mitochondrial carrier function.
  • To connect the study of yeast mitochondrial carriers to understanding human diseases.

Main Methods:

  • Utilizing Saccharomyces cerevisiae as a model organism.
  • Investigating the function of mitochondrial carrier proteins.
  • Analyzing genetic mutations and their impact on cellular metabolism.

Main Results:

  • Yeast provides a powerful system for studying fundamental mitochondrial processes.
  • Mitochondrial carriers in yeast share functional similarities with human counterparts.
  • This model facilitates the identification of disease-associated mechanisms.

Conclusions:

  • Yeast Saccharomyces cerevisiae is an effective model for mitochondrial carrier research.
  • Understanding yeast mitochondrial carriers offers insights into human metabolic diseases.
  • Further research in yeast can accelerate the development of therapeutic strategies.