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. 1990 Jun;172(6):2855–2861. doi: 10.1128/jb.172.6.2855-2861.1990

Isolation and characterization of a new mutant of Saccharomyces cerevisiae with altered synthesis of 5-aminolevulinic acid.

E Carvajal 1, A D Panek 1, J R Mattoon 1
PMCID: PMC209081  PMID: 2188943

Abstract

A new gene, RHM1, required for normal production of 5-aminolevulinic acid by Saccharomyces cerevisiae, was identified by a novel screening method. Ethyl methanesulfonate treatment of a fluorescent porphyric strain bearing the pop3-1 mutation produced nonfluorescent or weakly fluorescent mutants with defects in early stages of tetrapyrrole biosynthesis. Class I mutants defective in synthesis of 5-aminolevulinate regained fluorescence when grown on medium supplemented with 5-aminolevulinate, whereas class II mutants altered in later biosynthetic steps did not. Among six recessive class I mutants, at least three complementation groups were found. One mutant contained an allele of HEM1, the structural gene for 5-aminolevulinate synthase, and two mutants contained alleles of the regulatory gene CYC4. The remaining mutants contained genes complementary to both hem1 and cyc4. Mutant strain DA3-RS3/68 contained mutant gene rhm1, which segregated independently of hem1 and cyc4 during meiosis. 5-Aminolevulinate synthase activity of the rhm1 mutant was 35 to 40% of that of the parental pop3-1 strain, whereas intracellular 5-aminolevulinate concentration was only 3 to 4% of the parental value. Transformation of an rhm1 strain with a multicopy plasmid containing the cloned HEM1 gene restored normal levels of 5-aminolevulinate synthase activity, but intracellular 5-aminolevulinate was increased to only 9 to 10% of normal. We concluded that RHM1 could control either targeting of 5-aminolevulinate synthase to the mitochondrial matrix or the activity of the enzyme in vivo.

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Selected References

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