Glycoproteomic characterization of butyrylcholinesterase from human plasma

Daniel Kolarich*, Alfred Weber, Martin Pabst, Johannes Stadlmann, Wolfgang Teschner, Hartmut Ehrlich, Hans Peter Schwarz, Friedrich Altmann

*Corresponding author for this work

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Human butyrylcholinesterase (hBChE) is a highly glycosylated protein present in human plasma. The enzyme hydrolyses choline esters, for example benzoylcholine, butyrylthiocholine and acetylthiocholine as well as noncholine esters like heroin and aspirin. hBChE is primarily involved in neuronal transmission and is a potential bioscavenger of toxic organophosphates to protect acetylcholinesterase. A prerequisite for the therapeutic use of hBChE is a detailed characterization of this glycoprotein purified from human plasma. In this study, MS/MS could confirm most of the protein backbone, including the N- and the C-terminus. Site-specific analysis of all nine potential N-glycosylation sites revealed mainly mono- and disialylated N-glycans to be present on this glycoprotein. Sialic acids (Neu5Ac) are mainly α2,6-linked, however a fraction of the N-glycans contained Neu5Ac also in α2,3 linkage. On monosialylated N-glycans, sialic acid is exclusively located on the 3-arm and in α2,6 linkage, as verified by 2D-HPLC and exoglycosidase digests of 2-aminopyridine (PA)-labelled N-glycans. This first comprehensive glycoproteomic analysis of the important human plasma glycoprotein BChE did not give any indication of O-glycosylation or any other kind of PTMs as previously postulated.

Original languageEnglish
Pages (from-to)254-263
Number of pages10
JournalProteomics
Volume8
Issue number2
DOIs
Publication statusPublished - Jan 2008

Keywords

  • Aminopyridine
  • Butyrylcholinesterase
  • Glycoproteomics
  • N-glycan
  • Porous graphitized carbon

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