Identification of a fourth gene involved in dTDP-rhamnose synthesis in Streptococcus mutans

Y. Tsukioka, Y. Yamashita, Y. Nakano, T. Oho, T. Koga

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

We had isolated three genes (rmlA, rmlB, and rmlC) involved in dTDP- rhamnose synthesis in Streptococcus mutans and found that three genes were insufficient for dTDP-rhamnose synthesis (Y. Tsukioka, Y. Yamashita, T. Oho, Y. Nakano, and T. Koga, J. Bacteriol. 179:1126-1134, 1997). The rmlD gene of S. mutans, encoding the enzyme which catalyzes the last step of dTDP- rhamnose synthesis, has been cloned and sequenced. The cell extract of Escherichia coli expressing the rmlD gene of S. mutans exhibited enzymatic activity corresponding to its counterpart in Shigella flexneri, a gram- negative bacterium. Rhamnose was not detected in the cell wall preparation purified from the mutant in which the cloned gene was insertionally inactivated. Rabbit antiserum against S. mutans serotype c-specific antigen did not react with autoclaved extracts from the mutant. The rmlD gene product of S. mutans compensated for the incompleteness of dTDP-rhamnose synthesis by the three previously isolated genes. These results indicate that the rmlD gene product is indispensable for the dTDP-rhamnose pathway and subsequently far the synthesis of serotype-specific antigen in S. mutans. Furthermore, conservation of the rmlD gene in Streptococcus species was demonstrated by Southern blot analysis.

Original languageEnglish
Pages (from-to)4411-4414
Number of pages4
JournalJournal of bacteriology
Volume179
Issue number13
DOIs
Publication statusPublished - Jan 1 1997

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Rhamnose
Streptococcus mutans
Genes
Shigella flexneri
Antigens
Southern Blotting
Streptococcus
Cell Extracts
Gram-Negative Bacteria
Cell Wall
Immune Sera
Escherichia coli
Rabbits

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology

Cite this

Identification of a fourth gene involved in dTDP-rhamnose synthesis in Streptococcus mutans. / Tsukioka, Y.; Yamashita, Y.; Nakano, Y.; Oho, T.; Koga, T.

In: Journal of bacteriology, Vol. 179, No. 13, 01.01.1997, p. 4411-4414.

Research output: Contribution to journalArticle

Tsukioka, Y. ; Yamashita, Y. ; Nakano, Y. ; Oho, T. ; Koga, T. / Identification of a fourth gene involved in dTDP-rhamnose synthesis in Streptococcus mutans. In: Journal of bacteriology. 1997 ; Vol. 179, No. 13. pp. 4411-4414.
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