Plasmid-mediated complementation of a delta-aminolevulinic-acid-requiring Saccharomyces cerevisiae mutant.

Recombinant plasmids able to complement the Saccharomyces cerevisiae ole3 mutation were isolated. The nucleotide sequence responsible for complementation was localized to a 3.5-kb region. The level of delta-aminolevulinate (ALV) synthase activity in wild-type cells was six-fold lower than in plasmid-transformed ole3 mutant cells. Certain clones secreted a compound that supported growth of a lawn of adjacent ole3 mutant cells.