The pcsA gene is identical to dinD in Escherichia coli.

AUTOR(ES)

Ohmori, H

RESUMO

The pcsA68 mutant of Escherichia coli is a cold-sensitive mutant which forms long filaments with a large nucleoid in the central region at 20 degrees C. We here show that (i) the coding region for the pcsA gene is identical with orfY located upstream of pyrE and can be deleted without loss of viability; (ii) pcsA is also identical to dinD, a DNA damage-inducible gene, whose expression is regulated by the LexA-RecA system; (iii) the cold-sensitive phenotype of the pcsA68 mutation is suppressed by delta recA or lexA1 (Ind-) mutation, but not by sulA inactivation; (iv) overproduction of PcsA68 leads to inhibition of cell growth in recA+ and delta recA strains at 20 and 37 degrees C, but PcsA+ does not show such an effect at any temperature; (v) SOS response is induced in the pcsA68 mutant cells at 20 degrees C. We discuss the possible function of the pcsA gene, comparing it with the sulA or the dif-xerCD function. We also describe a new method for gene disruption with positive and negative selection.

Documentos Relacionados

• Multicopy suppressors of the cold-sensitive phenotype of the pcsA68 (dinD68) mutation in Escherichia coli.
• The DNA damage-inducible dinD gene of Escherichia coli is equivalent to orfY upstream of pyrE.
• DNA polymerase II is encoded by the DNA damage-inducible dinA gene of Escherichia coli.
• The htrM gene, whose product is essential for Escherichia coli viability only at elevated temperatures, is identical to the rfaD gene.
• Order of ribosomal protein genes in the Rif cluster of Bacillus subtilis is identical to that of Escherichia coli.