Blood group A glycolipid antigen biosynthesis: discrimination between biosynthesized and enzyme preparation derived blood group A antigen by mass spectrometry.

A monofucosyl type 1 chain blood group A hexaglycosylceramide was biosynthesized in solution using the type 1 chain blood group H pentaglycosylceramide as precursor, a crude microsomal fraction prepared from the mucosa scraping of a blood group A pig small intestine as enzyme source, and uridine diphosphate-N-acetyl-(1-14C)galactosamine as sugar donor. The radioactive product was enriched using reversed-phase column chromatography and silica gel HPLC. The peak, as detected by a beta-flow scintillation counter, was collected, permethylated, and analyzed by mass spectrometry. Carbohydrate sequence ions were found, indicating the presence of both the biosynthesized and a native, non-14C-containing blood group A hexaglycosylceramide. The blood group A pig small intestinal mucosa used as the enzyme source contain blood group A hexaglycosylceramide as the predominant glycolipid. Therefore, it is concluded that the nonradioactive blood group A hexaglycosylceramide found after the biosynthesis is derived from the enzyme preparation.

Jacobsson, A (författare)
Breimer, Michael,1951Gothenburg University,Göteborgs universitet,Medicinska institutionen,Department medicine(Swepub:gu)xbremi (författare)
Samuelsson, B E (författare)
Göteborgs universitetMedicinska institutionen (creator_code:org_t)

Av författaren/redakt...: Holgersson, J; Jacobsson, A; Breimer, Michael ...; Samuelsson, B E

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