Human non-secretory ribonucleases. II. Structural characterization of the N-glycans of the kidney, liver and spleen enzymes by NMR spectroscopy and electrospray mass spectrometry.

Publication/Presentation Date

6-1-1993

Abstract

The N-glycans have been removed by peptide-N-glycosidase F (PNGase F) from purified human non-secretory RNases derived from kidney, liver and spleen. The spleen RNase was purified by two procedures, one of which did not include the usual acid treatment step (0.25 M H2SO4, 45 min, 4 degrees C), to determine if acid treatment alters the carbohydrate moieties. The N-glycans of the RNases were fractionated by Bio-Gel P-4 chromatography and analysed by 600 MHz 1H-NMR spectroscopy and electrospray mass spectrometry. All four non-secretory RNase preparations contained the following structures: [formula: see text] The relative amounts of the trisaccharide, pentasaccharide and hexasaccharide appeared to vary slightly in the different tissue RNases. The overall results indicate: (i) that acid treatment during purification does not alter the N-glycans of non-secretory RNases; (ii) that the N-glycans from kidney, liver and spleen non-secretory RNases are very similar, if not identical, to one another, but different from the N-glycan structures reported for secretory RNase.

Volume

3

Issue

3

First Page

249

Last Page

259

ISSN

0959-6658

Disciplines

Medicine and Health Sciences

PubMedID

8358150

Department(s)

Department of Pathology and Laboratory Medicine

Document Type

Article

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