Transcription factor STP1 - Q00947 (STP1_YEAST)


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Transcription factor involved in the regulation of gene expression in response to extracellular amino acid levels. Synthesized as latent cytoplasmic precursor, which, upon a signal initiated by the plasma membrane SPS (SSY1-PTR3-SSY5) amino acid sensor system, becomes proteolytically activated and relocates to the nucleus, where it induces the expression of SPS-sensor-regulated genes, including the amino-acid permeases AGP1, BAP2, BAP3 and GNP1. Binding to promoters is facilitated by DAL81. Involved in the repression of genes subject to nitrogen catabolite repression and genes involved in stress response. Negatively regulated by inner nuclear membrane proteins ASI1, ASI2 and ASI3, which prevent unprocessed precursor forms that escape cytoplasmic anchoring from inducing SPS-sensor-regulated genes. May be involved in pre-tRNA splicing. UniProt
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Subunit Structure
Interacts (via Region II) with SSY5; protease component of the SPS-sensor. UniProt
The N-terminal inhibitory domain contains conserved sequence elements important for cytoplasmic retention (Region I) and proteolytic processing (Region II) of the protein. Region I is also required for ASI1/2/3-mediated negative regulation of transcription. UniProt
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