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Related Concept Videos

Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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.
Most of the mitochondrial precursors...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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.
Transport of mitochondrial precursors across the TIM23 channel is driven by...

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The Use of the Patch-Clamp Technique to Study the Thermogenic Capacity of Mitochondria
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Mitochondrial uncoupling protein 1 expression in thymocytes.

Alison E Adams1, Audrey M Carroll, Padraic G Fallon

  • 1School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland.

Biochimica Et Biophysica Acta
|May 13, 2008
PubMed
Summary
This summary is machine-generated.

Mitochondrial uncoupling protein 1 (UCP1) is present in mouse and rat thymocytes. However, an antibody to full-length UCP1 lacks specificity, while CIDEA expression remains unaffected in UCP1-deficient thymocytes.

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Area of Science:

  • Immunology
  • Mitochondrial Biology
  • Cellular Physiology

Background:

  • Mitochondrial uncoupling protein 1 (UCP1) plays a role in thermogenesis.
  • The presence and function of UCP1 in non-adipose tissues, such as thymocytes, are not fully understood.
  • Antibody specificity is crucial for accurate protein detection in biological studies.

Purpose of the Study:

  • To confirm the presence of UCP1 in thymocytes using a specific antibody.
  • To evaluate the specificity of an antibody raised against full-length UCP1.
  • To investigate the impact of UCP1 absence on CIDEA expression in thymocytes.

Main Methods:

  • Immunoblotting using peptide-specific and full-length UCP1 antibodies.
  • Analysis of thymocytes and tissue mitochondria from UCP1 wild-type and knock-out mice, and rats.
  • Quantification of CIDEA protein levels via immunoblotting.

Main Results:

  • A peptide-specific antibody confirmed UCP1 presence in mouse and rat thymocytes.
  • An antibody to full-length UCP1 showed non-specific binding across various tissues and UCP1 genotypes.
  • CIDEA expression levels were comparable in thymocytes from UCP1 wild-type and knock-out mice.

Conclusions:

  • UCP1 is present in thymocytes of both rats and mice.
  • The antibody targeting full-length UCP1 is not specific for UCP1 detection.
  • The absence of UCP1 does not alter the native expression of CIDEA in thymocytes.