I-CeuI reveals conservation of the genome of independent strains of Salmonella typhimurium.

AUTOR(ES)

Liu, S L

RESUMO

The enzyme I-CeuI, encoded by a class I mobile intron inserted in the gene for 23S rRNA in Chlamydomonas eugamatos, cleaves a specific 19-bp sequence in this gene. This sequence is present only in the seven genes for rRNA in Salmonella typhimurium and Escherichia coli. Partial digestion with I-CeuI of DNA from 17 wild-type strains of S. typhimurium indicates that the chromosome of these strains is strongly conserved, for the digestion products closely resemble those of strain LT2. The lengths and order of chromosomal segments are conserved in 15 of the strains; 2 show some rearrangements. XbaI digestion indicated heterogeneity without revealing the genomic structure. Because of conservation of I-CeuI sites in genes for rRNA and conservation of the number and locations of these genes, I-CeuI provides an excellent tool for the rapid examination of the chromosomes of related species of bacteria; differences in the fingerprints indicate the occurrence of chromosomal rearrangements such as insertions or inversions.

Documentos Relacionados

• Evolutionarily conserved and functionally important residues in the I-CeuI homing endonuclease.
• The I-CeuI endonuclease recognizes a sequence of 19 base pairs and preferentially cleaves the coding strand of the Chlamydomonas moewusii chloroplast large subunit rRNA gene.
• Transfectability of rough strains of Salmonella typhimurium.
• Convergently functional, Rho-independent terminator in Salmonella typhimurium.
• Purification of pseudouridylate synthetase I from Salmonella typhimurium.