Summary
Constitutivity for the synthesis of the urea amidolyase bienzymatic complex is obtained by dur0hmutations located in the regulatory genetic region adjacent to the dur1, dur2 gene cluster. The dur0hmutations act only in cis and are a new case of cis effect strongly cancelled in α/a diploid, similar to cargA +0hmutation shown previously to lead to arginase constitutivity. Illegitimate diploids do not show such a cancellation of constitutivity.
The constitutivity produced by dur0hmutation comprises the process of induction and the release of the glutamine effect. It does not impair the NH +4 effect.
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Communicated by W. Gajewski
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Lemoine, Y., Dubois, E. & Wiame, JM. The regulation of urea amidolyase of Saccharomyces cerevisiae . Molec. Gen. Genet. 166, 251–258 (1978). https://doi.org/10.1007/BF00267616
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DOI: https://doi.org/10.1007/BF00267616