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. 1987 Sep;169(9):4041–4048. doi: 10.1128/jb.169.9.4041-4048.1987

Identification of the structural gene for dipeptidyl aminopeptidase yscV (DAP2) of Saccharomyces cerevisiae.

P Suárez Rendueles, D H Wolf
PMCID: PMC213706  PMID: 3305478

Abstract

Mutants of Saccharomyces cerevisiae lacking dipeptidyl aminopeptidase yscV were isolated from a strain already defective in dipeptidyl aminopeptidase yscIV, an enzyme with overlapping substrate specificity. The mutants were identified by a staining technique with the chromogenic substrate Ala-Pro-4-methoxy-beta-naphthylamide to screen colonies for the absence of the enzyme. One of the mutants had a thermolabile activity, indicating that it contained a structural gene mutation. The 53 mutants analyzed fell into one complementation group that corresponded to the yscV structural gene, DAP2. The defect segregated 2:2 in meiotic tetrads, indicating a single chromosomal gene mutation, which was shown to be recessive. Diploids heterozygous for DAP2 displayed gene dosage effects with respect to yscV enzyme activity. The absence of dipeptidyl aminopeptidase yscV or the combined loss of both dipeptidyl aminopeptidases yscIV and yscV did not affect mitotic growth under rich or poor growth conditions. In contrast to the dipeptidyl aminopeptidase yscIV lesion (ste13), which leads to alpha sterility because strains secrete incompletely processed forms of the alpha-factor pheromone, the dipeptidyl aminopeptidase yscV lesion did not affect mating, and strains produced fully active alpha-factor pheromone. dap2 mutants did not show any obvious phenotype under a variety of conditions tested.

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Selected References

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