In vitro and in vivo modification of Neisseria gonorrhoeae lipooligosaccharide epitope structure by sialylation

doi:10.1084/jem.171.5.1649

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In vitro and in vivo modification of Neisseria gonorrhoeae lipooligosaccharide epitope structure by sialylation

RE Mandrell, AJ Lesse, JV Sugai, M Shero, JM Griffiss, JA Cole, NJ Parsons, H Smith, SA Morse and MA Apicella
Center for Immunochemistry, Veterans Administration Medical Center, San Francisco, California 94121.

After growth of gonococci in the presence of cytidine monophospho-N- acetyl-neuraminic acid (CMP-NANA), their 4.5-kD lipooligosaccharide (LOS) component was increased by approximately 400 daltons, whereas the LOS of strains lacking the 4.5-kD component were unaffected. Expression of mAb-defined epitopes on the 4.5-kD component was decreased on LOS of strains grown in CMP-NANA, and treatment of the LOS with neuraminidase reversed this affect. Gonococci incubated with human PMNs also had decreased expression of the 4.5-kD+ epitopes. A detergent extract of gonococci incorporated radiolabeled NANA in the LOS, suggesting the presence of a sialyltransferase in gonococci. Exogenous sialyltransferases also could use LOS as an acceptor.
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