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Nucleotide exchange in mitochondria: insight at a molecular level
Eva Pebay-Peyroula1, Gérard Brandolin
1Institut de Biologie Structurale, UMR 5075 CEA-CNRS-Université Joseph Fourier, 41 rue Jules Horowitz, F-38027 Grenoble cedex 1, France. pebay@ibs.fr
Current Opinion in Structural Biology
|August 18, 2004
Summary
The ADP/ATP carrier protein
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Mitochondrial carrier proteins facilitate metabolite transport across the inner mitochondrial membrane.
- The ADP/ATP carrier is crucial for cellular energy homeostasis, importing ADP and exporting ATP.
- It is the most extensively studied mitochondrial carrier, with its high-resolution structure recently elucidated.
Purpose of the Study:
- To elucidate the high-resolution structure of the ADP/ATP carrier.
- To gain insights into the mechanism of adenine nucleotide binding and transport.
Main Methods:
- High-resolution structural analysis of the ADP/ATP carrier protein.
Main Results:
- The structure reveals six transmembrane helices forming a closed bundle toward the mitochondrial matrix.
- A funnel-shaped cavity opens to the intermembrane space, terminating in a narrow pit.
- Analysis of cavity residues suggests adenine nucleotide binding mechanisms, and conserved prolines indicate a translocation pathway.
Conclusions:
- The determined structure provides a molecular basis for understanding ADP/ATP carrier function.
- Key structural features, including the cavity and proline residues, offer insights into the transport mechanism.