Structural heterogeneity in the core oligosaccharide of the S-layer glycoprotein from Aneurinibacillus thermoaerophilus DSM 10155.
The surface layer glycoprotein of Aneurinibacillus thermoaerophilus DSM 10155 has a total carbohydrate content of 15% (by mass), consisting of O-linked oligosaccharide chains. After proteolytic digestion of the S-layer glycoprotein byPronase E and subsequent purification of the digestion products by gel permeation chromatography, chromatofocusing and high-performance liquid chromatography two glycopeptide pools A and B with identical glycans and the repeating unit structure -->4)-alpha-l-Rha p -(1-->3)-beta-d- glycero -d- manno -Hep p -(1--> (Kosma et al., 1995b, Glycobiology, 5, 791-796) were obtained. Combined evidence from modified Edman-degradation in combination with liquid chromatography electrospray mass-spectrometry and nuclear magnetic resonance spectroscopy revealed that both glycopeptides contain equal amounts of the complete core structure alpha-l-Rha p -(1-->3)-alpha-l-Rha p -(1-->3)-beta-d-Gal p NAc-(1-->O)-Thr/Ser and the truncated forms alpha-l-Rha p -(1-->3)-beta-d-Gal p NAc-(1-->O)-Thr/Ser and beta-d-Gal p NAc-(1-->O)-Thr/Ser. All glycopeptides possessed the novel linkage types beta-d-Gal p NAc-(1-->O)-Thr/Ser. The different cores were substituted with varying numbers of disaccharide repeating units. By 300 MHz proton nuclear magnetic resonance spectroscopy the complete carbohydrate core structure of the fluorescently labeled glyco-peptide B was determined after Smith-degradation of its glycan chain. The NMR data confirmed and complemented the results of the mass spectroscopy experiments. Based on the S-layer glycopeptide structure, a pathway for its biosynthesis is suggested.
Zentrum für Ultrastrukturforschung und Ludwig Boltzmann-Institut für Molekulare Nanotechnologie, Universität für Bodenkultur, A-1180 Wien, Austria.
T
T
Wugeditsch
N E
NE
Zachara
M
M
Puchberger
P
P
Kosma
A A
AA
Gooley
P
P
Messner
D001407:Bacillus / Q000737:chemistry*; D001426:Bacterial Proteins / Q000737:chemistry* / Q000302:isolation & purification; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D006020:Glycopeptides / Q000737:chemistry / Q000302:isolation & purification; D008562:Membrane Glycoproteins / Q000737:chemistry* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D009844:Oligosaccharides / Q000737:chemistry* / Q000302:isolation & purification; D011402:Pronase; D018629:Spectrometry, Mass, Secondary Ion
D001426:Bacterial Proteins; D006020:Glycopeptides; D008562:Membrane Glycoproteins; D009844:Oligosaccharides; C055764:S-layer proteins; D011402:Pronase