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The HMGB protein Ixr1 interacts with Ssn8 and Tdh3 involved in transcriptional regulation.

FEMS Yeast Res.2018 Mar 01;18(2)
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摘要


Ixr1 is a Saccharomyces cerevisiae transcriptional factor that extensively regulates the response to hypoxia and controls other important cellular functions and DNA repair. During aerobic growth, the Ixr1 repressor function is predominant on regulated promoters of hypoxic genes, although activator effects are also observed on other genes. During hypoxia, Ixr1 expression increases and the number of genes activated by Ixr1 also increase. In this work we demonstrate that the NH2-terminal region of Ixr1 is involved in transcriptional activation. We also present the first analysis about Ixr1 interactions with three factors that have been previously identified as important players in the yeast hypoxic response, Cyc8, Tup1 and Ssn8; results demonstrate that only Ssn8 binds to Ixr1. We have also looked for other Ixr1-binding proteins associated with transcriptional regulation, by co-purification and mass spectrometry identification. Tdh3, a protein involved in transcriptional silencing, is among the new identified Ixr1-binding proteins. Differential phosphorylation of Ixr1 is found when comparing aerobic and hypoxic yeast growth. Implication of these results in transcriptional regulation mediated by Ixr1 is discussed.

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