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1: Gene. 1996 Oct 24;177(1-2):103-7.Links

The galE gene encoding the UDP-galactose 4-epimerase of Brevibacterium lactofermentum is coupled transcriptionally to the dmdR gene.

Oguiza JA, Marcos AT, Malumbres M, Martín JF.

Department of Ecology, Genetics and Microbiology, Faculty of Biology, University of León, Spain.

The galE gene of Brevibacterium lactofermentum, encoding UDP-galactose 4-epimerase (EC 5.1.3.2), has been identified by DNA sequencing downstream from the orf1-sigB-dmdR region. The arrangement of the sigB-dtxR-galE cluster is also conserved in Corynebacterium diphtheriae. The deduced galE product was a protein of 329 aa residues (35.4 kDa) that shared a high degree of identity to known UDP-galactose 4-epimerase proteins from Gram-positive microorganisms (Streptomyces lividans and Streptococcus thermophilus). Transcriptional analysis of the dmdR and galE genes in nutrient-rich medium showed that these genes are part of an operon, that is actively transcribed as a bicistronic mRNA during the exponential growth phase, but transcription of the operon is decreased during the stationary growth phase. In addition, the dmdR gene was also expressed as a monocistronic 0.7-kb transcript during the active growth phase.

PMID: 8921853 [PubMed - indexed for MEDLINE]