Neonatal plasminogen displays altered cell surface binding and activation kinetics. Correlation with increased glycosylation of the protein.

Journal Article

Plasminogen isolated from 60 full-term newborns differs from adult plasminogen in carbohydrate composition, kinetic activation constants, and cell binding. Amino acid composition and amino-terminal sequence analysis data indicate that the plasminogens of neonates and adults have the same amino acid sequence. Like the adult, the neonate has two glycoforms, but both have significantly more mannose and sialic acid than the adult forms. The difference in the neonatal glycosylation is probably responsible for the altered migration observed by isoelectric focusing. Moreover, the difference in carbohydrate composition appears to be the basis of the decreased functional activity of the neonatal plasminogen. The kcat/Km ratios indicate that the overall activation rates of the two neonatal plasminogen glycoforms are lower compared with the adult glycoforms. In addition, neonatal plasminogen does not bind as well to cellular receptors compared with adult plasminogen. These studies suggest a basis for the decreased fibrinolytic activity observed in neonates.

Full Text

Duke Authors

Cited Authors

  • Edelberg, JM; Enghild, JJ; Pizzo, SV; Gonzalez-Gronow, M

Published Date

  • July 1, 1990

Published In

Volume / Issue

  • 86 / 1

Start / End Page

  • 107 - 112

PubMed ID

  • 2365810

International Standard Serial Number (ISSN)

  • 0021-9738

Digital Object Identifier (DOI)

  • 10.1172/JCI114671

Language

  • eng

Conference Location

  • United States