Abstract
Extract: Differences in sialic acid content and not genetic polymorphism determine the observed electrophoretic heterogeneity of human lactoferrin, the iron-binding protein of external secretions. Lactoferrin molecules have at least one to four sialic acid residues. The asialo derivative is electrophoretically homogeneous.Speculation: As with other nonhuman iron-binding proteins from various species, human lactoferrin from several secretions was shown to have varying sialic acid content. A regulatory role of sialic acid in the regulation of secretion and function of lactoferrin is postulated.
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