Phosphorylation, nitrosation and plasminogen K3 modulation make VDAC-1 lucid as part of the extrinsic apoptotic pathway-Resulting thesis: Native VDAC-1 indispensible for finalisation of its 3D structure
Abstract
Native and recombinant VDAC preparations differ in their acetylation, phosphorylation and nitrosation state; additionally, proteineous modulators are missing in the latter. They thus vary in channel characteristics, as can be taken from comparative black lipid bilayer experiments. Furthermore, the multi-compartment expression makes expect even differing native VDAC-1 molecules. Recent structural work on mammalian VDAC-1 has only used recombinant material, refolded from Escherichia coli inclusion bodies. While this approach established the basic three-dimensional structure of VDAC-1, a ß-barrel set up by nineteen ß-pleated sheets, dissent is on positioning and movements of its free N-terminal helical peptide stretch preceding ß-pleated sheet-1. A synopsis of data concerning posttranslational modifications, cyto-topology and physiology of native VDAC-1, from my point of view, suggests that the finalisation of its three-dimensional structure will need native channel preparations to be studied. Concerning relevance, recent evidence on the regulation of cell membrane-integrated VDAC-1 by posttranslational modifications and proteineous modulators, taken together with experimental demonstrations that VDAC-1 is involved in cell volume ...Continue Reading
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