Extramitochondrial Porin: Facts and Hypotheses |
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Authors: | György Báthori Isabella Parolini Ildikó Szabó Francesco Tombola Angela Messina Marta Oliva Massimo Sargiacomo Vito De Pinto Mario Zoratti |
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Institution: | (1) Department of Physiology, Semmelweis Medical University, Budapest, Hungary;(2) SOTE Élettani Intézet, 1088 Puskin u. 9, Budapest, Hungary;(3) Department of Hematology and Oncology, Istituto Superiore di Sanita;aa, Rome, Italy;(4) CNR Center for Biomembranes, Department Biomedical Sciences, University of Padova, Italy;(5) Institute of Biochemical and Pharmacological Sciences, University of Catania, Italy |
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Abstract: | Mitochondrial porin, or VDAC, is a pore-forming protein abundant in the outer mitochondrialmembrane. Several publications have reported extramitochondrial localizations as well, butthe evidence was considered insufficient by many, and the presence of porin in nonmitochondrialcellular compartments has remained in doubt for a long time. We have now obtained newdata indicating that the plasma membrane of hematopoietic cells contains porin, probablylocated mostly in caveolae or caveolae-like domains. Porin was purified from the plasmamembrane of intact cells by a procedure utilizing the membrane-impermeable labeling reagentNH-SS-biotin and streptavidin affinity chromatography, and shown to have the same propertiesas mitochondrial porin. A channel with properties similar to that of isolated VDAC wasobserved by patch-clamping intact cells. This review discusses the evidence supportingextramitochondrial localization, the putative identification of the plasma membrane porin with the maxi chloride channel, the hypothetical mechanisms of sorting porin to various cellularmembrane structures, and its possible functions. |
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Keywords: | Porin VDAC caveolae plasmalemma cholesterol transport maxi chloride channel patch clamp biotin |
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