Haemophilus influenzae Type b Strain A2 Has Multiple Sialyltransferases Involved in Lipooligosaccharide Sialylation*

The lipooligosaccharide (LOS) ofHaemophilus influenzae contains sialylated glycoforms, and a sialyltransferase, Lic3A, has been previously identified. We report evidence for two additional sialyltransferases, SiaA, and LsgB, that affect N-acetyllactosamine containing glycoforms. Mutations in genes we have designated siaA and lsgBaffected only the sialylated glycoforms containingN-acetylhexosamine. A mutation in siaA resulted in the loss of glycoforms terminating in sialyl-N-acetylhexosamine and the appearance of higher molecular weight glycoforms, containing the addition of phosphoethanolamine, N-acetylgalactosamine, andN-acetylneuraminic acid. Chromosomal complementation of thesiaA mutant resulted in the expression of the original sialylated LOS phenotype. A mutation in lic3A resulted in the loss of sialylation only in glycoforms lackingN-acetylhexosamine and had no effect on sialylation of the terminal N-acetyllactosamine epitope. A double mutant insiaA and lic3A resulted in the complete loss of sialylation of the terminal N-acetyllactosamine epitope and expression of the higher molecular weight sialylated glycoforms seen in thesiaA mutant. Mutation of lsgB resulted in persistence of sialylated glycoforms but a reduction inN-acetyllactosamine containing glycoforms. A triple mutant of siaA, lic3A, and lsgB contained no sialylated glycoforms. These results demonstrate that the sialylation of the LOS of H. influenzae is a complex process involving multiple sialyltransferases.

• Publication year

  2002

• Venue

  Journal of Biological Chemistry

• Publication date

  2002-04-26

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1074/jbc.M110986200PMID 11842084
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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