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Dihydroorotic acid dehydrogenase activity of human diploid cell strains
Science (New York, N.Y.)
|May 3, 1968
Abstract:
A gene affecting the final two enzymes of uridylic acid biosynthesis does not affect a third, metabolically adjacent enzyme. Similarly, compounds that increase cellular activity for the affected enzymes do not increase activity for the third enzyme. The pyrimidine pathway can be subdivided into groups of concurrently responding enzymes. These groups may be smaller in human cells than they are in microbial cells.
Insights
A gene mutation impacts uridylic acid biosynthesis enzymes but not adjacent ones. This suggests distinct enzyme groups within the pyrimidine pathway, potentially smaller in humans than microbes.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Uridylic acid biosynthesis is crucial for nucleotide production.
- The pyrimidine pathway involves a series of enzymatic reactions.
- Understanding enzyme regulation provides insights into metabolic control.
Purpose of the Study:
- To investigate the genetic regulation of uridylic acid biosynthesis.
- To determine if adjacent enzymes in the pyrimidine pathway respond similarly to genetic and chemical stimuli.
- To explore potential differences in enzyme group coordination between human and microbial cells.
Main Methods:
- Genetic analysis of a specific gene affecting uridylic acid biosynthesis.
- Enzyme activity assays for metabolically linked enzymes.
- Comparative analysis of enzyme response in different cellular systems.
Main Results:
- A single gene mutation affected two enzymes in uridylic acid synthesis but not a third, adjacent enzyme.
- Compounds designed to boost activity of the affected enzymes did not influence the third enzyme.
- Evidence suggests the pyrimidine pathway can be divided into independently regulated enzyme groups.
- These enzyme groups appear to be smaller in human cells compared to microbial cells.
Conclusions:
- The pyrimidine pathway is not uniformly regulated; distinct enzyme clusters exist.
- Genetic and chemical perturbations reveal functional subdivisions within metabolic pathways.
- Human cells may exhibit more specialized enzyme regulation compared to microbial systems.