Identification of blood group A/A‐Leb/y and B/B‐Leb/y active glycotopes co‐expressed on the O‐glycans isolated from two distinct human ovarian cyst fluids
Identifieur interne : 001174 ( Main/Exploration ); précédent : 001173; suivant : 001175Identification of blood group A/A‐Leb/y and B/B‐Leb/y active glycotopes co‐expressed on the O‐glycans isolated from two distinct human ovarian cyst fluids
Auteurs : Shin-Yi Yu [Taïwan] ; Zhangung Yang [Taïwan] ; Kay-Hooi Khoo [Taïwan] ; Albert M. Wu [Taïwan]Source :
- PROTEOMICS [ 1615-9853 ] ; 2009-07.
Abstract
Although the individual human blood group A and B determinants are well defined, their co‐expression pattern on a particular glycan carrier in individuals of blood group AB status has not been delineated. To address this issue, complex O‐glycans were isolated from two distinct sources of human ovarian cyst glycoproteins (HOC 89 and Cyst 19) and profiled by advanced MS analyses, in conjunction with defining their binding characteristics against a panel of lectins and monoclonal antibodies. The major O‐glycans of HOC 89 were found to correspond to sialyl Tn, mono‐ and di‐sialyl T structures, whereas those of Cyst 19 were apparently more heterogeneous and extended to larger sizes. A minimal structure that carries both A and B determinants on the same molecule was identified, in which the A epitope is attached directly to the core GalNAc, whereas the B epitope is preferentially located on the six arms of a core 2 structure. Both arms can be further extended with internal fucosylation that appears to be restricted to those non‐sialylated chains already carrying the terminal ABH determinants, thus giving rise to rather prominent A/B‐Leb/y glycotopes on larger O‐glycans.
Url:
DOI: 10.1002/pmic.200800870
Affiliations:
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<front><div type="abstract" xml:lang="en">Although the individual human blood group A and B determinants are well defined, their co‐expression pattern on a particular glycan carrier in individuals of blood group AB status has not been delineated. To address this issue, complex O‐glycans were isolated from two distinct sources of human ovarian cyst glycoproteins (HOC 89 and Cyst 19) and profiled by advanced MS analyses, in conjunction with defining their binding characteristics against a panel of lectins and monoclonal antibodies. The major O‐glycans of HOC 89 were found to correspond to sialyl Tn, mono‐ and di‐sialyl T structures, whereas those of Cyst 19 were apparently more heterogeneous and extended to larger sizes. A minimal structure that carries both A and B determinants on the same molecule was identified, in which the A epitope is attached directly to the core GalNAc, whereas the B epitope is preferentially located on the six arms of a core 2 structure. Both arms can be further extended with internal fucosylation that appears to be restricted to those non‐sialylated chains already carrying the terminal ABH determinants, thus giving rise to rather prominent A/B‐Leb/y glycotopes on larger O‐glycans.</div>
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<name sortKey="Yang, Zhangung" sort="Yang, Zhangung" uniqKey="Yang Z" first="Zhangung" last="Yang">Zhangung Yang</name>
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