label: oligosaccharide transporting porin activity
label_lc: oligosaccharide transporting porin activity
description: "Enables the transfer of oligosaccharide, 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."