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Conformational flexibility within the N-terminal region of VDAC and its putative role in gating. (A) Diagram and surface representation of the X-ray structure of mVDAC1 to 2.3-Å resolution (8). (B) Proposed model for the closed conformation (8). A space-filling model for ATP indicates its size relative to the pore diameter. A path through VDAC that is sufficiently large for ATP to pass becomes partially occluded in the putative closed conformation.
