Enables the transfer of substances, sized less than 1000 Da, from one side of a membrane to the other. The transmembrane portions of porins consist exclusively of beta-strands which form a beta-barrel. They are found in the outer membranes of Gram-negative bacteria, mitochondria, plastids and possibly acid-fast Gram-positive bacteria. [GOC:mtg_transport, ISBN:0815340729, PMID:10839820, TC:1.B.1.-.-]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function
