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A new type of O-linked oligosaccharide has been
discovered on several proteins secreted by the Gram-negative bacterium
Flavobacterium meningosepticum, including Endo F
Volume 270,
Number 22,
Issue of June 2, pp. 13192-13196, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
Asp-Ser AND Asp-Thr-Thr CONSENSUS SITES
(three sites), Endo F
(one site), and a P40 protease
(one site). The oligosaccharide moiety is covalently attached via a
mannose residue to a serine or threonine at consensus sites
corresponding to Asp-Ser* or Asp-Thr*-Thr. Preliminary characterization
by mass spectroscopy revealed an oligosaccharide of 1244 Da at each of
the proposed glycosylation sites. Collision-associated dissociation
analysis showed a characteristic daughter ion series of m/z 218, 394, and 556, indicative of a common Flavobacterium oligosaccharide. Compositional analysis demonstrated an unusual
profile of monosaccharides, including hexoses, methylated hexoses, and
uronic acid derivatives.
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