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DUF3138 family protein
This family of proteins with unknown function appear to be restricted to Proteobacteria. (from Pfam)
outer membrane beta-barrel protein
BBP2 is a family of putative porin proteins that are likely to be outer membrane beta barrel proteins porins. (from Pfam)
porin family protein; TonB-dependent receptor
porin family protein is a member of a large superfamily consisting of classical (gram-negative ) porins which are non-specific channels for small hydrophillic molecules, maltoporin-like channels which have specificities for various sugars, and ligand-gated protein channels which cooperate with a TonB associated inner membrane complex to actively transport ligands via the proton motive force; TonB-dependent receptor may act as a channel to allow import of extracellular nutrients, such as iron-siderophore complexes or non-Fe compounds
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