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Volume 271, Number 32, Issue of August 9, 1996 pp. 19219-19224
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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Cloning and Expression of Sialidase L, a NeuAc23Gal-specific Sialidase from the Leech, Macrobdella decora

(Received for publication, March 4, 1996)

From the Department of Biochemistry, Tulane University School of Medicine, New Orleans, Louisiana 70112

Sialidase L is a NeuAc23Gal linkage-specific sialidase that releases 2,7-anhydro-NeuAc instead of NeuAc from sialoglycoconjugates (Chou, M.-Y., Li, S.-C., Kiso, M., Hasegawa, A., and Li, Y.-T. (1994) J. Biol. Chem. 269, 18821-18826). A 2.5-kilobase cDNA of sialidase L was cloned by a combination of methods based on polymerase chain reactions. The composite cDNA sequence reveals an open reading frame coding for 762 amino acids, including a putative 28-residue signal peptide at the N terminus that is similar to the signal sequence of the Clostridium septicum sialidase. The result suggests that sialidase L is a secretory enzyme. The coding sequence excluding the putative signal peptide of sialidase L was overexpressed in Escherichia coli. The purified recombinant enzyme was characterized to be as active as the enzyme isolated from the leech. It also possessed the strict NeuAc23Gal linkage specificity and released the unique cleavage product, 2,7-anhydro-NeuAc from sialoglycoconjugates. The deduced amino acid sequence of sialidase L exhibits little similarity with other reported sialidases. However, sialidase L contains a conserved ``FRIP region'' and four repeating ``Asp box'' motifs that align well with the corresponding positions of bacterial sialidases. The predicted -strand structures near the conserved motifs of sialidase L are similar to those of Salmonella typhimurium sialidase. Several conserved single amino acid residues of bacterial sialidases, including those known to be involved in the active site of Salmonella enzyme, are conserved in the deduced amino acid sequence of sialidase L. This observation suggests that part of the catalytic mechanism of sialidase L may be similar to the ordinary sialidase.

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