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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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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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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 translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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[Annexins in mitochondria].

Joanna Bandorowicz-Pikuła1, Marcin Woś1, Anna Sekrecka-Belniak1,2

  • 1Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteura Street, 02-093 Warsaw, Poland.

Postepy Biochemii
|January 30, 2017
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Summary

Annexins are calcium-binding proteins regulating cell membranes and signaling. This review explores their role in mitochondrial function and structure, highlighting their importance in cellular processes.

Keywords:
annexinsmitochondriamitochondrial morphogenesis

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Annexins are a conserved family of calcium- and phospholipid-binding proteins.
  • Their membrane interactions are modulated by intracellular calcium, pH, and membrane lipid composition.
  • Annexins play roles in membrane fusion, signaling, and transport.

Purpose of the Study:

  • To review the role of annexins in intracellular calcium homeostasis.
  • To explore the involvement of annexins in mitochondrial function and network structure.
  • To commemorate the 90th birthday of Professor Lech Wojtczak.

Main Methods:

  • Literature review focusing on annexin function.
  • Analysis of annexin interactions with cellular membranes and organelles.
  • Integration of data on annexin roles in calcium signaling and mitochondrial dynamics.

Main Results:

  • Annexins act as calcium sensors and regulators of membrane dynamics.
  • Evidence suggests annexins influence mitochondrial calcium uptake and release.
  • Annexins are implicated in maintaining mitochondrial network integrity.

Conclusions:

  • Annexins are critical regulators of cellular calcium homeostasis.
  • Their functions extend to the modulation of mitochondrial physiology.
  • Further research into annexin-mitochondria interactions is warranted.