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Mitochondrial Protein Sorting

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 Precursor Proteins

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...

Mitochondrial Membranes

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 Membranes

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,...

Translocation of Proteins into the Mitochondria

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,...

Energy to Drive Translocation

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...

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Mitochondrial uncoupling proteins.

¹Centre de Recherche sur l'Endocrinologie Moléculaire et le Développement, 92190 Meudon Cedex, France. ricquier@infobiogen.fr

Current Opinion in Drug Discovery & Development

|August 4, 2009

Summary

This summary is machine-generated.

Uncoupling proteins (UCPs) like UCP1, UCP2, and UCP3 regulate mitochondrial respiration and energy expenditure. While UCP1 is key for heat production, UCP2 and UCP3 have roles in lipid handling, inflammation, and immune responses.

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Area of Science:

Biochemistry
Cell Biology
Physiology

Background:

Mitochondrial respiration's coupling to ATP synthesis is not fully understood.
Brown adipose tissue uses uncoupling protein 1 (UCP1) for thermogenesis via regulated uncoupling.
UCP1 acts as a fatty acid-regulated proton translocator.

Purpose of the Study:

To explore the functions of newly identified UCP2 and UCP3.
To investigate the roles of UCP2 and UCP3 in energy expenditure and lipid metabolism.
To understand the involvement of UCP2 and UCP3 in broader physiological processes.

Main Methods:

Experimental data analysis supporting uncoupling activity of UCP2 and UCP3.
Review of physiological and genetic data regarding UCP2 and UCP3 functions.
Examination of hormonal and pharmacological regulation of UCP gene expression.

Main Results:

UCP2 is widely expressed, while UCP3 is found in skeletal muscle and brown adipose tissue.
Experimental evidence supports the respiration uncoupling role of UCP2 and UCP3.
Physiological data suggest UCP2/UCP3 roles in lipid handling, potentially beyond thermogenesis.

Conclusions:

UCP2 and UCP3 exhibit respiration uncoupling activity.
Evidence supports thermogenic roles for UCP2/UCP3, but lipid handling is also a key function.
UCP2/UCP3 may influence inflammation, immune responses, and fever, with their expression modulated by hormones and drugs.