Linked Life Data

7798209

Source:http://linkedlifedata.com/resource/pubmed/id/7798209

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
51
pubmed:dateCreated
1995-1-24
pubmed:abstractText
Using NMR spectroscopy and mass spectrometry, the major sialic acid of the skin mucus of the loach, Misgurnus anguillicaudatus was found to be 3-deoxy-D-glycero-D-galacto-2-nonulosonic acid (KDN). We have subsequently devised a method to isolate a KDN-containing glycoprotein preparation from loach skin mucus. The method involves the sonication of the skin mucus with 0.05 M Tris-HCl, pH 8.0, to solubilize the glycoprotein, followed by DE52-cellulose chromatography of the extract, Nuclease P1 treatment, and Sepharose CL-4B gel filtration. The purified glycoprotein preparation was found to contain 38.5% KDN, 0.4% NeuAc, 24.6% GalNAc, 3.3% Gal, and 28.2% amino acids (w/w). The amino acid composition of this glycoprotein preparation revealed that it is unusually rich in Thr, and 6 amino acids, Thr, Ser, Glu (or Gln), Pro, Gly and Ala, account for 83% of the total amino acids. This glycoprotein is extremely poor in Cys, Met, Tyr, Phe, Arg, and Trp. Treatment of this glycoprotein with alkali resulted in the destruction of 83% of Thr suggesting that most of the sugar chains in this glycoprotein are linked through Thr. Alkaline borohydride treatment of 100 mg of the glycoprotein preparation, followed by Sephadex G-25 (superfine) gel filtration, yielded two major oligosaccharide alditols, I (15.4 mg) and II (15.6 mg). Using liquid secondary ion mass spectrometry and methylation analysis, I was identified to be KDN alpha 2-->6GalNAc-ol and II, KDN alpha 2-->6(KDN alpha 2-->3)-GalNAc-o1. KDN alpha 2-->6GalNAc is structurally similar to NeuAc alpha 2-->GalNAc found in ovine submaxillary glycoprotein while II represents a novel structure which contains two sialic acids linked to a GalNAc through both alpha 2-->3 and alpha 2-->6 linkages. This structure has never been found in mucin type glycoproteins including mammalian epithelial mucin glycoproteins. This is the first report of the presence of a mucin type glycoprotein which contains KDN instead of NeuAc or NeuGc in fish skin mucus.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
23
pubmed:volume
269
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
32138-43
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Characterization of a deaminated neuraminic acid-containing glycoprotein from the skin mucus of the loach, Misgurnus anguillicaudatus.
pubmed:affiliation
Department of Applied Biological Sciences, Faculty of Agriculture, Saga University, Japan.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.