Sequence of the gtfK gene of Streptococcus salivarius ATCC 25975 and evolution of the gtf genes of oral streptococci
| Autor: | Philip M. Giffard, Nicholas A. Jacques, Donna M. Allen, Carolyn P. Milward, Christine L. Simpson |
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| Rok vydání: | 1993 |
| Předmět: |
Molecular Sequence Data
Dental Plaque Sequence alignment Regulatory Sequences Nucleic Acid Microbiology Open Reading Frames stomatognathic system Bacterial Proteins Amino Acid Sequence Gene Glucans Cloning Genetics Recombination Genetic Binding Sites Phylogenetic tree biology Base Sequence Sequence Homology Amino Acid Nucleic acid sequence Tooth surface Streptococcus biology.organism_classification Biological Evolution stomatognathic diseases Open reading frame Streptococcus salivarius Genes Bacterial Glucosyltransferases Sequence Alignment Algorithms |
| Zdroj: | Journal of general microbiology. 139(7) |
| ISSN: | 0022-1287 |
| Popis: | Summary: Many strains of oral streptococci secrete glucosyltransferases (GTFs) that polymerize sucrose into glucans that form an integral part of the plaque matrix on the tooth surface. Recently, we reported the cloning of two closely linked GTF-encoding genes (gtfJ and gtfK) from Streptococcus salivarius ATCC 25975 as well as the sequence of gtfJ, which encodes a primer-dependent GTF that synthesizes an insoluble product (a GTF-I). In this communication we report the sequence of gtfK, which encodes a primer-dependent GTF that synthesizes a soluble product (a GTF-S), as well as the sequence of a small downstream open reading frame of unknown function. The deduced sequence of GtfK was compared with those of seven other streptococcal Gtfs and an unrooted phylogenetic tree constructed. This analysis suggested that Gtfs with similar product specificities do not form phylogenetic clusters and was consistent with currently accepted phylogenetic schemes. The tree was tested by constructing a series of “sub-trees” from different blocks of the alignment. Evidence was obtained for recombination events involving gtfB and gtfC from S. mutans GS-5, gtfJ and gtfK from S. salivarius, as well as the gtfI genes from S. downei and S. sobrinus. The recombination events between gtfB and gtfC, and between the two gtfI genes, were confirmed by examining divergences at silent sites. |
| Databáze: | OpenAIRE |
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