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Lung is one of the organs of the rat with a particular abundance of haemagglutinating activity that is inhibited by beta-galactosides. This lectin activity can be attributed to a single protein that has been purified from rat lung; a similar protein has been purified from human lung. The molecular weights and subunit structures were estimated from gel filtration and sodium dodecyl sulphate/polyacrylamide-gel electrophoresis; the human lung lectin appeared to be composed to two identical subunits, mol.wt. 14500, whereas rat lung lectin was observed as both a dimer and a tetramer of one subunit type, mol.wt. 13500. Both lectins bind to disaccharides or oligosaccharides with terminal beta-linked galactose residues. The carbohydrate moiety may be free [lactose or D-galactopyranosyl-beta-(1 leads to 4)-thiogalactopyranoside], protein-bound (asialofetuin) or lipid-bound (cerebrosides). The molecular properties of the beta-galactoside-binding proteins of rat lung and human lung are closely similar to those of embryonic chick muscle lectin [Nowak, Kobiler, Roel &amp; Barondes (1977) Proc. Natl. Acad. Sci. U.S.A. 73, 1383--1387] and calf heart lectin [De Waard, Hickman &amp; Kornfeld (1976) J. Biol. Chem. 251, 7581--7587].

Purification and properties of lung lectin. Rat lung and human lung β-galactoside-binding proteins