Molecular and General Genetics MGG

, Volume 226, Issue 1, pp 190–197

The sialidase gene from Clostridium septicum: cloning, sequencing, expression in Escherichia coli and identification of conserved sequences in sialidases and other proteins


  • Beate Rothe
    • Biochemisches InstitutChristian-Albrechts-Universität zu Kiel
  • Bernd Rothe
    • Institut für MikrobiologieUniversität Stuttgart
  • Peter Roggentin
    • Biochemisches InstitutChristian-Albrechts-Universität zu Kiel
  • Roland Schauer
    • Biochemisches InstitutChristian-Albrechts-Universität zu Kiel

DOI: 10.1007/BF00273603

Cite this article as:
Rothe, B., Rothe, B., Roggentin, P. et al. Mol Gen Genet (1991) 226: 190. doi:10.1007/BF00273603


An oligonucleotide mixture corresponding to the codons for conserved and repeated amino acid sequences of bacterial sialidases (Roggentin et al. 1989) was used to clone a 4.3 kb PstI restriction fragment of Clostridium septicum DNA in Escherichia coli. The complete nucleotide sequence of the sialidase gene was determined from this fragment. The derived amino acid sequence corresponds to a protein of 110000 Da. The ribosomal binding site and promoter-like consensus sequences were identified upstream from the putative ATG initiation codon. The molecular and immunological properties of the sialidase expressed by E. coli are similar to those of the sialidase as isolated from C. septicum. The newly synthesized protein is assumed to include a leader peptide of 26 amino acids. On sequence alignment, the sialidases from C. septicum, C. sordellii and C. perfringens show significant homologies. As in other bacterial sialidases, conserved amino acid sequences occur at four positions in the protein. Aside from the consensus sequences, only poor homology to other bacterial and viral sialidases was found. The consensus sequence could be identified even in other, non-sialidase proteins, indicating a common function or the evolutionary relatedness of these proteins.

Key words

SialidaseGene structureAmino acid sequenceHomologyClostridium septicum

Copyright information

© Springer-Verlag 1991