Abstract
The complete nucleotide sequence of the Streptococcus mutans GS-5 scrB gene coding for sucrose-6-phosphate hydrolase activity was determined. A potential ribosome-binding site as well as promoter sequences were identified upstream from the gene. The deduced amino acid sequence of the enzyme suggested a molecular weight of 51,750, which is similar to that estimated for the enzyme isolated from strain GS-5. The enzyme is slightly acidic, with a pI of 5.9, and is a relatively hydrophilic protein. The nucleotide and amino acid sequences of the enzyme showed significant homology with those of the sacA protein from Bacillus subtilis. In addition, a region of amino acid homology with the S. mutans fructosyltransferase and B. subtilis levansucrase proteins was also detected.
MeSH Terms
Amino Acid Sequence
Base Sequence
Codon
DNA, Bacterial/genetics
Genes
Genes, Bacterial
Glycoside Hydrolases/genetics
Molecular Sequence Data
Sequence Homology, Nucleic Acid
Streptococcus mutans/enzymology,genetics
beta-Fructofuranosidase
Chemicals
Codon
DNA, Bacterial
Glycoside Hydrolases
beta-Fructofuranosidase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Sato Y
Department of Microbiology-Immunology, Northwestern University Medical-Dental Schools, Chicago, Illinois 60611.
Kuramitsu H K
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