Forms a channel through the mitochondrial outer membrane that allows diffusion of small hydrophilic molecules. The channel 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 (By similarity). Interacts with KIN14F/KP1 (PubMed:21406623). Interacts with FBA6 AND GAPC1 (PubMed:23316205). Expressed in leaf tips, anthers and stigma. Induced during the hypersensitive response to X.campestris pv campestris and by the bacterial pathogen P.syringae pv. tomato. Consists mainly of membrane-spanning sided beta-sheets. No visible phenotype under normal growth conditions. Belongs to the eukaryotic mitochondrial porin (TC 1.B.8.1) family.