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J Biol Chem, Vol. 274, Issue 17, 11945-11957, April 23, 1999

Analysis of the Pre-S2 N- and O-Linked Glycans of the M Surface Protein from Human Hepatitis B Virus

Sigrid Schmitt, Dieter Glebe§, Kim Alving, Tanja K. Tolle§, Monica Linder, Hildegard Geyer, Dietmar Linder, Jasna Peter-Katalinic, Wolfram H. Gerlich§, and Rudolf Geyer

From the Institute of Biochemistry, University of Giessen, Friedrichstrasse 24, D-35392 Giessen, Germany, the § Institute of Medical Virology, University of Giessen, Frankfurter Str. 107, D-35392 Giessen, Germany, and the  Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch-Strasse 31, D-48149 Münster, Germany

The surface antigen of hepatitis B virus comprises a nested set of small (S), middle (M), and large (L) proteins, all of which are partially glycosylated in their S domains. The pre-S2 domain, present only in M and L proteins, is further N-glycosylated at Asn-4 exclusively in the M protein. Since the pre-S2 N-glycan appears to play a crucial role in the secretion of viral particles, the M protein may be considered as a potential target for antiviral therapy. For characterization of the pre-S2 glycosylation, pre-S2 (glyco)peptides were released from native, patient-derived hepatitis B virus subviral particles by tryptic digestion, separated from remaining particles, purified by reversed-phase high performance liquid chromatography, and identified by amino acid and N-terminal sequence analysis as well as matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Pre-S2 N-glycans were characterized by anion exchange chromatography, methylation analysis, and on target sequential exoglycosidase digestions in combination with MALDI-TOF-MS, demonstrating the presence of partially sialylated diantennary complex-type oligosaccharides. In addition, the pre-S2 domain of M protein, but not that of L protein, was found to be partially O-glycosylated by a Gal(beta 1-3)GalNAcalpha -, Neu5Ac(alpha 2-3)Gal(beta 1-3)GalNAcalpha -, or GalNAcalpha -residue. The respective O-glycosylation site was assigned to Thr-37 by digestion with carboxypeptidases in combination with MALDI-TOF-MS and by quadrupole time-of-flight electrospray mass spectrometry. Analytical data further revealed that about 90% of M protein is N-terminally acetylated.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.


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