EXPRESSION OF HETEROLOGOUS PHOSPHOFRUCTOKINASE GENES IN YEAST

Genes encoding phosphofructokinases (PFK) from Escherichia coli and fr om the human muscle were expressed in PFK-deficient strains of Sacchar omyces cerevisiae under the control of an inducible GAL1 promoter. The y restored PFK activity under inducing conditions and complemented the galactose-negative growth phenotype of the recipient strains. The PFK enzymes expressed appear to be stable in yeast. The human muscle enzy me crossreacts with specific antibodies and shows the expected subunit size. As expected, its activity can be activated by fructose-2,6-bisp hosphate, in contrast to the bacterial enzyme.