We have identified an open reading frame on chromosome XI of the yeast, Saccharomyces cerevisiae, as encoding a protein with phospholipase D (PLD) activity. We have named this open reading frame, PLD1, and show that yeast bearing a disruption in this gene are unable to catalyze the hydrolysis of phosphatidylcholine. PLD1 encodes a hypothetical protein of 1683 amino acids and has a predicted molecular mass of 195 kDa. Yeast bearing disruptions at the PLD1 locus are morphologically normal and grow vegetatively like wild-type cells. In contrast, homozygous pld1 diploid cells are unable to sporulate and do not produce asci under conditions that induce meiosis and sporulation in wild-type cells. Thus, PLD1 is likely to be essential for the meiotic cycle in yeast cells.

This is the first identification of a eukaryotic, non-plant, phosphatidylcholine-hydrolyzing phospholipase D gene. Because the biological role of PLD is not well understood, we expect that pld1 yeast will become a useful tool for the characterization of PLD functions as well as for the identification of mammalian PLD homologs.

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