Characterization of Saccharomyces cerevisiae mutants lacking the E1 alpha subunit of the pyruvate dehydrogenase complex.
Pyruvate dehydrogenase mutants of Saccharomyces cerevisiae were isolated by disruption of the PDA1 gene. To this end, the PDA1 gene encoding the E1 alpha subunit of the pyruvate dehydrogenase complex was replaced by the dominant Tn5ble marker. Disruption of the PDA1 gene abolished production of the E1 alpha subunit and pyruvate dehydrogenase activity. Two additional phenotypes were observed in the Pdh-mutants: (a) a reduced growth rate in glucose medium which was partially complemented by the amino acid leucine; (b) an increase in formation of petites which lack mitochondrial DNA [rho0], during growth on glucose. Both phenotypes were shown to be a result of inactivation of the PDA1 gene. Explanations for these phenotypes are discussed.
Wenzel
T J
TJ
Department of Cellbiology and Genetics, Leiden University, The Netherlands.
van den Berg
M A
MA
Visser
W
W
van den Berg
J A
JA
Steensma
H Y
HY
D004251:DNA Transposable Elements; D004272:DNA, Mitochondrial / Q000032:analysis; D005800:Genes, Fungal; D005816:Genetic Complementation Test; D005838:Genotype; D046911:Macromolecular Substances; D016254:Mutagenesis, Insertional; D010957:Plasmids; D011768:Pyruvate Dehydrogenase Complex / Q000235:genetics* / Q000378:metabolism; D015183:Restriction Mapping; D012234:Rho Factor / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics*
D004251:DNA Transposable Elements; D004272:DNA, Mitochondrial; D046911:Macromolecular Substances; D011768:Pyruvate Dehydrogenase Complex; D012234:Rho Factor