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- W2783754045 abstract "Overexpression of the proinflammatory cytokine macrophage migration inhibitory factor (MIF) is linked to a number of autoimmune diseases and cancer. MIF production has been correlated to the number of CATT repeats in a microsatellite region upstream of the MIF gene. We have characterized the interaction of pituitary-specific positive transcription factor 1 (Pit-1) with a portion of the MIF promoter region flanking a microsatellite polymorphism (-794 CATT5-8). Using fluorescence anisotropy, we quantified tight complex formation between Pit-1 and an oligonucleotide consisting of eight consecutive CATT repeats (8xCATT) with an apparent Kd of 35 nM. Using competition experiments we found a 23 base pair oligonucleotide with 4xCATT repeats to be the minimum DNA sequence necessary for high affinity interaction with Pit-1. The stoichiometry of the Pit-1 DNA interaction was determined to be 2:1 and binding is cooperative in nature. We subsequently structurally characterized the complex and discovered a completely novel binding mode for Pit-1 in contrast to previously described Pit-1 complex structures. The affinity of Pit-1 for the CATT target sequence was found to be highly dependent on cooperativity. This work lays the groundwork for understanding transcriptional regulation of MIF and pursuing Pit-1 as a therapeutic target to treat MIF-mediated inflammatory disorders." @default.
- W2783754045 created "2018-01-26" @default.
- W2783754045 creator A5009877868 @default.
- W2783754045 creator A5089403623 @default.
- W2783754045 date "2017-11-23" @default.
- W2783754045 modified "2023-10-03" @default.
- W2783754045 title "Biochemical and structural characterization of a novel cooperative binding mode by Pit-1 with CATT repeats in the macrophage migration inhibitory factor promoter" @default.
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- W2783754045 doi "https://doi.org/10.1093/nar/gkx1183" @default.
- W2783754045 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5778499" @default.
- W2783754045 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29186613" @default.
- W2783754045 hasPublicationYear "2017" @default.
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