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J. Biol. Chem., Vol. 276, Issue 16, 12785-12790, April 20, 2001
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From the Institute for Biological Sciences, National Research
Council of Canada, Ottawa, Ontario, Canada, K1A 0R6
The L1 immunotype strain 126E of Neisseria
meningitidis has been shown to have an
N-acetyl-neuraminic acid-containing lipooligosaccharide in
which an
Dependence of the Bi-functional Nature of a Sialyltransferase
from Neisseria meningitidis on a Single Amino Acid
Substitution*
,
-linked galactose from a Pk epitope is
substituted at the O6 position (Wakarchuk, W. W., Gilbert, M.,
Martin, A., Wu, Y., Brisson, J. R., Thibault, P., and Richards,
J. C. (1998) Eur. J. Biochem. 254, 626-633).
Using a synthetic Pk-epitope containing acceptor in
glycosyltransferase reactions, we were able to show by NMR analysis of
the reaction product that the 126E(L1)-derived sialyltransferase can
make both
-2,3 and
-2,6 linkages to the terminal galactose. Gene
disruption experiments showed that the lst gene in 126E(L1)
was responsible for the in vivo addition of the
-2,6-linked N-acetyl-neuraminic acid residue. By
site-directed mutagenesis it was possible to change the
MC58(L3)-derived enzyme into a bifunctional enzyme with a single amino
acid change at position 168, where a glycine was changed to an
isoleucine. We performed a gene replacement experiment where the
126E(L1)
-2,3/6-sialyltransferase was replaced by allelic exchange
with the monofunctional MC58(L3)
-2,3-sialyltransferase and with the mutant MC58(L3) allele G168I. We observed that the level of LOS sialylation with the G168I allele was very similar to that of the wild
type 126E(L1), indicating that residue 168 is the critical residue for
the
-2,6-sialyltransferase activity in vitro as well as
in vivo.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed: Immunochemistry
Program, Institute for Biological Sciences, National Research Council
of Canada, 100 Sussex Dr., Ottawa, Ontario, Canada K1A 0R6. Fax:
613-941-1327; E-mail: warren.wakarchuk@nrc.ca.
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