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Volume 270, Number 15, Issue of April 14, pp. 8805-8814, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
Cloning and Expression of the - N-Acetylglucosaminidase Gene from Streptococcus pneumoniae
GENERATION OF TRUNCATED ENZYMES WITH MODIFIED AGLYCON SPECIFICITY

Valerie A. Clarke , Nick Platt , Terry D. Butters

The gene encoding a - N-acetylglucosaminidase from Streptococcus pneumoniae has been obtained by screening an expression library for - N-acetylglucosaminidase activity. Clones of different nucleotide sizes each having arylglycoside activity were obtained, and DNA sequencing revealed a gene of 3933 base pairs possessing typical bacterial transcription initiation and termination sequences and terminating in an ochre stop codon. Computer analysis of the translated protein of 1311 amino acids (144,210 Da) identified a tandem repeat within which lies a sequence homologous with six other hexosaminidase gene products from a wide variety of species ranging from bacteria to humans. Also found were an amino-terminal putative secretion signal peptide and a carboxyl-terminal cell sorting/anchorage motif typically found in over 20 other Gram-positive surface proteins. The expression of an almost complete DNA clone in Escherichia coli produced a functional and authentic - N-acetylglucosaminidase with aglycon specificity identical to the wild-type enzyme. However, enzymes produced from truncated DNA clones show more restricted aglycon specificity and are unable to hydrolyze terminal 1-2GlcNAc residues from N-glycans containing a bisecting N-acetylglucosamine. The availability of these clones allows structural analyses to be made of catalytic and oligosaccharide recognition protein domains that enhance functional activity.




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