Abstract
The distribution of porin on the outer membranes of rat heart mitochondria has been studied by means of immunogold labelling with antibodies to the N-terminal part of the human protein. It was found that only a minority of isolated, unfixed mitochondria are labelled by these antibodies, with the gold particles frequently organized in threads or bands. Extensive immunogold labelling is frequently observed on regions of outer membranes stripped away from mitochondria and on regions separating two mitochondrial compartments whose cristae display different configurations (possibly representing two mitoplasts covered by a common outer membrane). Also, pairs of connected mitochondria are sometimes heavily labelled in the “neck” regions, which may represent the junctions involved in electrical communication between mitochondria in cardiac tissue.
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Konstantinova, S.A., Mannella, C.A., Skulachev, V.P. et al. Immunoelectron microscopic study of the distribution of porin on outer membranes of rat heart mitochondria. J Bioenerg Biomembr 27, 93–99 (1995). https://doi.org/10.1007/BF02110336
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DOI: https://doi.org/10.1007/BF02110336