Roles of the Dal82p domains in allophanate/oxalurate-dependent gene expression in Saccharomyces cerevisiae.
Allophanate/oxalurate-induced gene expression in Saccharomyces cerevisiae requires at least five transcription factors, four of which act positively (Gln3p, Gat1p, Dal81p, and Dal82p) and one negatively (Dal80p). Gln3p binds to and Gat1p is proposed to bind to single GATA sequences; Dal80p binds to pairs of specifically oriented and spaced GATA sequences, and Dal82p binds to a pathway-specific element, UIS(ALL). Dal82p consists of at least three domains as follows: (i) UIS(ALL) DNA-binding, (ii) transcriptional activation, and (iii) coiled-coil(DAL82). Here we show that the coiled-coil(DAL82) domain possesses two demonstrable functions. (i) It prevents Dal82p-mediated transcription when inducer is absent. (ii) It is a major, although not exclusive, domain through which the inducer signal is received. Supporting the latter conclusion, a 38-amino acid fragment, containing little more than the coiled-coil(DAL82) domain, supports oxalurate-inducible, Dal81p-dependent, reporter gene transcription. Dal81p is required for inducer responsiveness of LexAp-Dal82p and LexAp coiled-coil(DAL82)-mediated transcription but isn't needed for inducer-dependent activation mediated by a Dal82p containing deletions in both the coiled-coil(DAL82), UIS(ALL)-binding domains. There may be an interaction between Dal81p and the coiled-coil(DAL82) domain since (i) Dal81p is required for transcription mediated by LexA-coiled-coil(DAL82)p and (ii) a Dal81p-Dal82p complex is detected by two-hybrid assay.
Scott
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Department of Microbiology and Immunology, University of Tennessee, Memphis, Tennessee 38163, USA.
Abul-Hamd
A T
AT
Cooper
T G
TG
D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D005656:Fungal Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D017930:Genes, Reporter; D008954:Models, Biological; D010072:Oxamic Acid / Q000031:analogs & derivatives* / Q000378:metabolism*; D010957:Plasmids / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012097:Repressor Proteins; D012441:Saccharomyces cerevisiae / Q000737:chemistry* / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism; D015534:Trans-Activators; D014157:Transcription Factors / Q000737:chemistry* / Q000235:genetics; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D020798:Two-Hybrid System Techniques; D014508:Urea / Q000031:analogs & derivatives* / Q000378:metabolism*; D001616:beta-Galactosidase / Q000378:metabolism; D000099160:LexA Repressor Protein
D001426:Bacterial Proteins; D004247:DNA; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D010072:Oxamic Acid; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D012697:Serine Endopeptidases; D015534:Trans-Activators; D014157:Transcription Factors; D014508:Urea; D001616:beta-Galactosidase; D000099160:LexA Repressor Protein; C067023:DAL81 protein, S cerevisiae; C082970:DAL82 protein, S cerevisiae; C071664:GLN3 protein, S cerevisiae; C054306:allophanic acid; C008727:oxaluric acid