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Inactivation of the yeast nuclear gene YMe2 causes an increased rate of DNA escape from mitochondria to the nucleus. Mutations in yme2 also show genetic interactions with yme1, a second gene that affects DNA escape from mitochondria to the nucleus. The yme1 cold-sensitive growth phenotype is suppressed by yme2 mutations. In addition, yme1 yme2 double mutants exhibit a synthetic growth defect on ethanol-glycerol medium at 30 degrees C. YME2 was isolated by complementation of the synthetic growth defect of yme1 yme2 strains and was found to be identical with the previously cloned RNA12 gene. The dominant temperature-sensitive mutation RNA12-1 prevents growth of yeast cells at 37 degrees C. YME2 encodes a protein with a predicted molecular weight of 96,681 and is an integral inner mitochondrial membrane protein. The larger carboxyl-terminal domain of the YME2 gene product faces the intermembrane space. Null alleles of yme2 display the same genetic interactions with yme1 and high rate of DNA escape from mitochondria as do the originally isolated yme2 mutant strains. Disruption of yme2 causes a strain-dependent growth defect on nonfermentable carbon sources.

molecular and cellular biology

Inactivation of <i>YME2/RNA12</i>, Which Encodes an Integral Inner Mitochondrial Membrane Protein, Causes Increased Escape of DNA from Mitochondria to the Nucleus in <i>Saccharomyces cerevisiae</i>

Inactivation of YME2/RNA12, Which Encodes an Integral Inner Mitochondrial Membrane Protein, Causes Increased Escape of DNA from Mitochondria to the Nucleus in Saccharomyces cerevisiae