Characterization of the Intracellular Distribution of Adenine Nucleotide Translocase (ANT) in Drosophila Indirect Flight Muscles

Vivek K. Vishnudas, Shawna S. Guillemette, Panagiotis Lekkas, David W. Maughan, Jim O. Vigoreaux

Department of Biology, University of Vermont, Burlington, USA.
Department of Biology, University of Vermont, Burlington, USA Berg Biosystems, Framingham, USA.
Department of Biology, University of Vermont, Burlington, USA Department of Cancer Biology, University of Massachusetts Medical School, Worcester, USA.
Department of Biology, University of Vermont, Burlington, USA Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, USA.
Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, USA.

DOI: 10.4236/cellbio.2013.23017                

Abstract

Background: The high power output necessary for insect flight has driven the evolution of muscles with large myofibrils (primary energy consumers) and abundant mitochondria (primary energy suppliers). The intricate functional interrelationship between these two organelles remains largely unknown despite its fundamental importance in understanding insect flight bioenergetics. Unlike vertebrate muscle that relies on a phosphagen (creatine phosphate/creatine kinase) system to regulate high energy phosphate flux, insect flight muscle has been reported to lack mitochondrial arginine kinase (analogous to creatine kinase), a key enzyme that enables intracellular energy transport. Creatine kinase is known to interact with mitochondrial adenine nucleotide translocase (ANT) in the transfer of ADP and ATP into and out of the mitochondria. Results: Here, we use quantitative immunogold transmission electron microscopy to show that in Drosophila melanogaster indirect flight muscles (IFM), ANT is present in the mitochondria as well as throughout the myofibril. To confirm this unexpected result, we created a transgenic line that expresses a chimeric GFP-ANT protein and used an anti-GFP antibody to determine the intracellular distribution of the fusion protein in the IFM. Similar to results obtained with anti-ANT, the fusion GFP-ANT protein is detected in myofibrils and mitochondria. We confirmed the absence of arginine kinase from IFM mitochondria and show that its sarcomeric (i.e., intramyofibrillar) distribution is similar to that of ANT. Conclusions: These results raise the possibility that direct channeling of nucleotides between mitochondria and myofibrils is assisted by an ANT protein thereby circumventing the need for a phosphagen shuttle in the IFM. The myofibrillar ANT may represent a unique adaptation in the muscles that require efficient exchange of nucleotides between mitochondria and myofibrils.

Keywords

Drosophila; Insect Flight Muscle; Adenine Nucleotide Translocase; Phosphagen System

Conflicts of Interest

The authors declare no conflicts of interest.

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