Characterization of the N-glycosylation phenotype of erythrocyte membrane proteins in congenital dyserythropoietic anemia type II (CDA II/HEMPAS) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-05

AUTHORS

Jonas Denecke, Christian Kranz, Manfred Nimtz, Harald S. Conradt, Thomas Brune, Hermann Heimpel, Thorsten Marquardt

ABSTRACT

Congenital dyserythropoetic anemia type II (CDA II) is characterized by bi- and multinucleated erythroblasts and an impaired N-glycosylation of erythrocyte membrane proteins. Several enzyme defects have been proposed to cause CDA II based on the investigation of erythrocyte membrane glycans pinpointing to defects of early Golgi processing steps. Hitherto no molecular defect could be elucidated. In the present study, N-glycosylation of erythrocyte membrane proteins of CDA II patients and controls was investigated by SDS-Page, lectin binding studies, and MALDI-TOF/MS mapping in order to allow an embracing view on the glycosylation defect in CDA II. Decreased binding of tomato lectin was a consistent finding in all typical CDA II patients. New insights into tomato lectin binding properties were found indicating that branched polylactosamines are the main target. The binding of Aleuria aurantia, a lectin preferentially binding to alpha1-6 core-fucose, was reduced in western blots of CDA II erythrocyte membranes. MALDI-TOF analysis of band 3 derived N-glycans revealed a broad spectrum of truncated structures showing the presence of high mannose and hybrid glycans and mainly a strong decrease of large N-glycans suggesting impairment of cis, medial and trans Golgi processing. CONCLUSION: Truncation of N-glycans is a consistent finding in CDA II erythrocytes indicating the diagnostic value of tomato-lectin studies. However, structural data of erythrocyte N-glycans implicate that CDA II is not a distinct glycosylation disorder but caused by a defect disturbing Golgi processing in erythroblasts. More... »

PAGES

375-382

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10719-007-9089-1

DOI

http://dx.doi.org/10.1007/s10719-007-9089-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005839157

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/18166993


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curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1007/s10719-007-9089-1'

RDF/XML is a standard XML format for linked data.

curl -H 'Accept: application/rdf+xml' 'https://scigraph.springernature.com/pub.10.1007/s10719-007-9089-1'


 

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