Sulfate transport in Aspergillus nidulans: a novel gene encoding alternative sulfate transporter.
In Aspergillus nidulans sulfate is taken up by sulfate permease encoded by the sB gene. A unique tight auxotrophic mutant with an impaired promoter region of the sulfate permease gene, sB1(pr), was isolated. Three suppressor genes were cloned by complementation of this mutation. One of them, described here, is the astA gene (alternative sulfate transporter) derived from a genomic library of the Japanese A. nidulans IAM 2006 strain. In the reference strain of Glasgow origin the astA gene was found to be a pseudogene having several nucleotide deletions in ORF. The gene encodes a novel type of sulfate transporter which is distinct from other known sulfate permeases forming the SulP family. The putative ASTA protein belongs to an extensive and poorly characterized Dal5 allantoate permease family of fungal organic anion transporters. We have shown that ASTA is a physiological sulfate transporter. We also report cloning and characterization of the sB gene in this work. Both genes, sB and astA, are regulated at the transcriptional level by sulfur metabolite repression (SMR).
Piłsyk
Sebastian
S
Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Department of Genetics, 5A Pawińskiego Str, 02-106 Warszawa, Poland.
Natorff
Renata
R
Sieńko
Marzena
M
Paszewski
Andrzej
A
D000595:Amino Acid Sequence; D027321:Anion Transport Proteins / Q000737:chemistry / Q000235:genetics*; D001233:Aspergillus nidulans / Q000235:genetics* / Q000378:metabolism*; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics*; D016153:Genes, Suppressor; D005816:Genetic Complementation Test; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D016366:Open Reading Frames; D010802:Phylogeny; D011401:Promoter Regions, Genetic; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013431:Sulfates / Q000378:metabolism*
D027321:Anion Transport Proteins; D004271:DNA, Fungal; D005656:Fungal Proteins; D013431:Sulfates; C022702:sulfate permease