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Volume 271, Number 26, Issue of June 28, 1996 pp. 15373-15380
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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Purification, Cloning, and Expression of a Cytidine 5-Monophosphate N-Acetylneuraminic Acid Synthetase from Haemophilus ducreyi

(Received for publication, February 14, 1996, and in revised form, April 10, 1996)

Michael V. Tullius , Robert S. Munson Jr.^¶ , Jing Wang ^¶ and Bradford W. Gibson

From the  Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94143-0446, the ^¶ Children's Hospital Research Foundation, and the  Departments of Pediatrics and Medical Microbiology and Immunology, Ohio State University, Columbus, Ohio 43205-2696

An N-acetylneuraminic acid cytidylyltransferase (EC) (CMP-NeuAc synthetase) was isolated from a Haemophilus ducreyi strain 35000 cell lysate and partially characterized. The enzyme catalyzes the reaction of CTP and NeuAc to form CMP-NeuAc, which is the nucleotide sugar donor used by sialyltransferases. Previous studies have shown that the outer membrane lipooligosaccharides of H. ducreyi contain terminal sialic acid attached to N-acetyllactosamine and that this modification is likely important to its pathogenesis. Therefore, to investigate the role of sialic acid in H. ducreyi pathogenesis, the gene encoding the CMP-NeuAc synthetase was cloned using degenerate oligonucleotide probes derived from NH₂-terminal sequence data, and the nucleotide sequence was determined. The derived amino acid sequence of the CMP-NeuAc synthetase gene has homology to other CMP-NeuAc synthetases and to a lesser extent to CMP-2-keto-3-deoxy-D-manno-octulosonic acid synthetases. The gene was cloned into a T7 expression vector, the protein expressed in Escherichia coli, and purified to apparent homogeneity by anion exchange, Green 19 dye, and hydrophobic interaction chromatography. The final step yielded 20 mg of pure protein/liter of culture. The protein has a predicted molecular mass of 25440.6 Da, which was confirmed by electrospray mass spectrometry (M_expt = 25439.9 ± 1.4 Da). The enzyme appears to exist as a dimer by size exclusion chromatography. In contrast to other bacterial CMP-NeuAc synthetases, the H. ducreyi enzyme exhibited a different substrate specificity, being capable of also using N-glycolylneuraminic acid as a substrate.

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