M. Konrad authored a 1992 study isolating and characterizing the Saccharomyces cerevisiae gene for guanylate kinase. The enzyme transfers a terminal phosphoryl group from ATP to guanosine monophosphate, producing ADP and guanosine diphosphate in a reversible reaction.[ref]
Cloning and expression of the essential gene for guanylate kinase from yeast by M. Konrad. Abstract: reaction and gene isolation
Disrupting the gene caused recessive lethality, supporting its necessity for vegetative growth under the tested conditions. Inducible gene expression also produced large quantities of guanylate kinase in both Saccharomyces cerevisiae and Escherichia coli.[ref]
Cloning and expression of the essential gene for guanylate kinase from yeast by M. Konrad. Abstract: insertional mutation and expression systems
These interventions addressed complementary questions. Loss of function tested whether the native system could grow without the gene's contribution; increased expression made the protein available for biochemical measurements. The ability to express a protein abundantly does not by itself establish that the corresponding gene is essential.
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