Abstract
In 1989, we demonstrated for the first time the expression of the VDAC 'Porin 31HL' in the plasmalemma of human B lymphocytes, then giving first evidence of a multi-topological expression of VDAC. Meanwhile, data from this and other laboratories support our proposal of a multi-compartment distribution of the channel in mammalian tissues. Here, by biotinylation of plasmalemma-integrated proteins of proven living B lymphocytes, followed by two-dimensional electrophoresis, immuno- and streptavidin affinity blotting, we show that part of the channel molecules can be labelled at the outer membrane of the cells. Thus, by a relevant approach our results invalidate objections concerning putative cross-reactivity of anti-human Type-1 porin antibodies with non-VDAC proteins at the outer cell membrane.
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