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. 1975 Aug;123(2):604–615. doi: 10.1128/jb.123.2.604-615.1975

Pyrimidine biosynthetic pathway of Baccillus subtilis.

B W Potvin, R J Kelleher Jr, H Gooder
PMCID: PMC235766  PMID: 169225

Abstract

Biochemical and genetic data were obtained from a series of 51 Pyr- strains of Bacillus subtilis. The observed enzymatic deficiencies allowed the mutants to be placed into 12 clases, some of which represent defects in more than one of the six known pyrimidine biosynthetic enzymes. Mapping analysis by transformation has shown that all the Pyr- mutations are located in a single small area of the B. subtilis genome. A correlation of the biochemical defects and the genetic data has been made. Those mutations conferring similar enzymatic deficiencies were found to be contiguous on the B. subtilis map. Regulatory aspects of the pyrimidine pathway have also been investigated and are compared to previously reported results from other organisms. Evidence is presented which bears upon the possible physical association of the first three enzymes and the association of at least some of the enzymes of this pathway with particulate elements of the cell. A model for the organization of the enzymes is presented with dihydroorotate dehydrogenase as the central enzyme in a proposed aggregate.

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Selected References

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