12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Human corneal keratan sulfates
View graph of relations

« Back

Human corneal keratan sulfates

Research output: Contribution to journalJournal article

Published

Journal publication date7/11/1997
JournalJournal of Biological Chemistry
Journal number45
Volume272
Number of pages5
Pages28227-28231
Original languageEnglish

Abstract

The keratan sulfate-containing proteoglycans were isolated from fourteen pooled human corneas (thirteen from 61- to 86-year-olds, plus one from a 12-year-old). These proteoglycans were subjected to digestion with the enzyme keratanase II, and the released oligosaccharides, which included nonreducing termini and repeat region oligosaccharides but not linkage regions, were reduced with alkaline borohydride and identified on two separate ion-exchange columns. Both of the latter had been calibrated with samples, most of which had been derived from bovine corneal keratan sulfate (Tai, G.-H., Huckerby, T. N., and Nieduszynski, I. A. (1996) J. Biol, Chem. 271, 23535-23546) and all of which had been fully characterized by NMR spectroscopic analysis, The capping structures identified in human corneal keratan sulfates occurred in the relative proportions: NeuAc alpha(2-6)- >NeuAc alpha(2-3)- >GaINAc(S)beta(1-3)-. The other groups of capping structures which had been identified in bovine corneal keratan sulfate, i.e. NeuGc alpha(2-3)-, NeuGc alpha(2-6)-, GlcNAc(S)beta(1-3)- were absent, although the possibility of the presence of some Gal alpha(1-3)-structures could not be excluded. In addition, the human sample showed significantly higher levels of alpha(1-3) fucosylated repeat region structures than did the bovine sample, and it is not clear whether this reflects a species or age dependence as the bovine corneas were from young animals, whereas the human corneas were predominantly from an older group. The charge densities and keratan sulfate chain sizes of the human and bovine keratan sulfate-containing proteoglycans were seen to be similar.