A Gene Coding for the Uric Acid-Xanthine Permease of Aspergillus Nidulans: Inactivational Cloning, Characterization, and Sequence of a Cis-Acting Mutation

AUTOR(ES)

Diallinas, G.

RESUMO

In Aspergillus nidulans, integration of transforming sequences can proceed through recombination with homologous sequences or at heterologous sites in the genome. In a strain with a large deletion in the gene coding for acetamidase (amdS), a plasmid carrying this gene integrates into and inactivates uapA, the putative structural gene for uric acid-xanthine permease, with a frequency of 0.3%. The integration event occurs 3' to the open reading frame of amdS. A 10-nucleotide sequence which occurs in this region is also found within the open reading frame of uapA. We have taken advantage of this integration event to clone the permease gene and to characterize a cis-acting mutation, uap-100, as a duplication of 139 bp located in the upstream region of uapA. Northern and dot blot analyses confirmed earlier results measuring the uptake of uric acid: the transcription of the uapA gene is inducible and the uap-100 mutation results in a bypass of the need for induction while having an 8-fold up-promoter effect under inducing conditions.

Documentos Relacionados

• cis-acting proteins.
• Introduction of a cis-Acting Mutation in the Capsid-Coding Gene of Moloney Murine Leukemia Virus Extends Its Leukemogenic Properties
• Identification of a cis-Acting Replication Element within the Poliovirus Coding Region
• Characterization of cis-acting sequences regulating root-specific gene expression in tobacco.
• Characterization of a cis-acting regulatory mutation that maps at the distal end of the Escherichia coli glyA gene.