4c69
From Proteopedia
ATP binding to murine voltage-dependent anion channel 1 (mVDAC1).
Structural highlights
Function[VDAC1_MOUSE] Forms a channel through the mitochondrial outer membrane and also the plasma membrane. The channel at the outer mitochondrial membrane allows diffusion of small hydrophilic molecules; in the plasma membrane it is involved in cell volume regulation and apoptosis. It adopts an open conformation at low or zero membrane potential and a closed conformation at potentials above 30-40 mV. The open state has a weak anion selectivity whereas the closed state is cation-selective. May participate in the formation of the permeability transition pore complex (PTPC) responsible for the release of mitochondrial products that triggers apoptosis.[1] [2] [3] Publication Abstract from PubMedThe voltage-dependent anion channel (VDAC) mediates the flow of metabolites and ions across the outer mitochondrial membrane of all eukaryotic cells. The open channel passes millions of ATP molecules per second, whereas the closed state exhibits no detectable ATP flux. High-resolution structures of VDAC1 revealed a 19-stranded beta-barrel with an alpha-helix partially occupying the central pore. To understand ATP permeation through VDAC, we solved the crystal structure of mouse VDAC1 (mVDAC1) in the presence of ATP, revealing a low-affinity binding site. Guided by these coordinates, we initiated hundreds of molecular dynamics simulations to construct a Markov state model of ATP permeation. These simulations indicate that ATP flows through VDAC through multiple pathways, in agreement with our structural data and experimentally determined physiological rates. Structure-guided simulations illuminate the mechanism of ATP transport through VDAC1.,Choudhary OP, Paz A, Adelman JL, Colletier JP, Abramson J, Grabe M Nat Struct Mol Biol. 2014 Jun 8. doi: 10.1038/nsmb.2841. PMID:24908397[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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