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Volume 153, Issue 11

The orotate transporter encoded by from is required for orotate utilization and has utility as a food-grade selectable marker Free

Abstract

A new lactococcal plasmid, pDBORO, was isolated from the subsp. biovar strain DB0410. This plasmid is responsible for the sensitivity of DB0410 to the toxic pyrimidine analogue 5-fluoroorotate. The complete nucleotide sequence has been determined and amounts to 16 404 bp. Of 15 ORFs encountered, three were found to be insertion sequence (IS) elements, identified as two IS and one IS. Two ORFs are incomplete due to the insertion of an IS element in their C-terminal region. Homologues for four ORFs were found in the IL1403 sequence: the gene, coding for a copper-potassium-transporting ATPase B, and the , and genes. The structural organization of the pDBORO replication region is highly similar to other theta-replicating plasmids in both the - () and -acting ( and ) sequences. By plasmid deletion analysis and molecular cloning, a single locus on pDBORO was found to confer sensitivity to 5-fluoroorotate. It was identified as , but renamed in order to reflect its function. The gene was found to be essential for the utilization of orotate as the sole pyrimidine source in a strain deficient in pyrimidine synthesis. The amino acid sequence encoded by the ORF showed the characteristic features of a membrane protein. Therefore, most probably encodes an orotate transporter. Surprisingly, homologues of could be identified in the genomes of both MG1363 and IL1403 despite the fact that these strains were unable to significantly utilize orotate. Cloning of in and showed that the orotate transport phenotype could be transformed to both organisms. The findings presented indicate that can be used as a powerful, food-grade selection/counterselection marker in many different organisms.

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2007-11-01
2024-04-25
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The orotate transporter encoded by oroP from Lactococcus lactis is required for orotate utilization and has utility as a food-grade selectable marker
Microbiology 153, 3645 (2007); https://doi.org/10.1099/mic.0.2007/005959-0
/content/journal/micro/10.1099/mic.0.2007/005959-0
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