Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10771983 | Biochemical and Biophysical Research Communications | 2005 | 6 Pages |
Abstract
In this study we have generated a EYFP targeted to the mitochondrial intermembrane space (MIMS-EYFP) to determine for the first time the pH within this compartment. The fragment encoding HAI-tagged EYFP was fused with the C-terminus of glycerol-phosphate dehydrogenase, an integral protein of the inner mitochondrial membrane. Human ECV304 cells transiently transfected with MIMS-EYFP showed the typical mitochondrial network, co-localized with MitoTracker Red. Following the calibration procedure, an estimation of the pH value in the intermembrane space was obtained. This value (6.88 ± 0.09) was significantly lower than that determined in the cytosol after transfection with a cytosolic EYFP (7.59 ± 0.01). Further, the pH of the mitochondrial matrix, determined with a EYFP targeted to this subcompartment, was 0.9 pH units higher than that in the intermembrane space. In conclusion, MIMS-EYFP represents a novel powerful tool to monitor pH changes in the mitochondrial intermembrane space of live cells.
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Authors
Anna Maria Porcelli, Anna Ghelli, Claudia Zanna, Paolo Pinton, Rosario Rizzuto, Michela Rugolo,