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Two different dihydroorotate dehydrogenases in Lactococcus lactis.

P S Andersen·P J Jansen·K Hammer
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Abstract

The pyrimidine de novo biosynthesis pathway has been characterized for a number of organisms. The general pathway consists of six enzymatic steps. In the characterization of the pyrimidine pathway of Lactococcus lactis, two different pyrD genes encoding dihydroorotate dehydrogenase were isolated. The nucleotide sequences of the two genes, pyrDa and pyrDb, have been determined. One of the deduced amino acid sequences has a high degree of homology to the Saccharomyces cerevisiae dihydroorotate dehydrogenase, and the other resembles the dihydroorotate dehydrogenase from Bacillus subtilis. It is possible to distinguish between the two enzymes in crude extracts by using different electron acceptors. We constructed mutants containing a mutated form of either one or the other or both of the pyrD genes. Only the double mutant is pyrimidine auxotrophic.

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Amino Acid SequenceBase SequenceDihydroorotate DehydrogenaseEscherichia coliGenes, BacterialGenetic Complementation TestLactococcus lactisModels, GeneticMolecular Sequence DataMultigene FamilyMutationOxidoreductasesOxidoreductases Acting on CH-CH Group DonorsRecombinant ProteinsRecombination, GeneticRestriction MappingSequence Analysis, DNASequence Homology, Amino AcidSubstrate SpecificityComparative StudyJournal ArticleResearch Support, Non-U.S. Gov't

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P S Andersen, P J Jansen, K Hammer. 1994. Two different dihydroorotate dehydrogenases in Lactococcus lactis.. https://doi.org/10.1128/jb.176.13.3975-3982.1994

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