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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Correlation between restriction map, genetic map and catalytic functions in the gene complex URA2.

We replaced the URA2 gene by six different deleted alleles constructed in vitro by Bg/II digestion in order to correlate the genetic map with the restriction map and to define the regions coding for the different functions of the carbamylphosphate synthetase--aspartate transcarbamylase complex (CPSase-ATCase). We also enlarged the collection of ura2 point mutations by using a positive selection method based on resistance to the toxic accumulation of ureidosuccinic acid (USA). Of the new independent mutations nine mapped in the intermediary zone, a previously defined mutationless region localized between regions coding for CPSase and ATCase. This shows that the former definition resulted from analysis of a limited number of mutants (40). The study of an allele deleted in the intermediary zone shows that this sequence codes for a protein region necessary for the feedback inhibition of the CPSase-ATcase enzyme complex. The CPSase- ATCase- phenotype of 26 mutants resistant to USA accumulation shows the importance of the in vivo channelling of carbamylphosphate in the CPSase-ATCase complex for USA and subsequent pyrimidine biosynthesis. Finally, our results confirm that the CPSase and ATCase activities are separate functions.[1]


  1. Correlation between restriction map, genetic map and catalytic functions in the gene complex URA2. Potier, S., Souciet, J.L., Lacroute, F. Mol. Gen. Genet. (1987) [Pubmed]
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