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• W2007965495 abstract "The nuclease hypersensitive element NHE III(I) is an important anti-cancer target as the transcription of oncogene c-myc is largely regulated by it. It has been postulated that regulatory control is mediated by G-quadruplex formation in the NHE anti-sense strand through a competition between the duplex and the quadruplex states. A mutation in the NHE has been implicated in cancer. In this study, the reported mutation has been characterized vis-a-vis the kinetics of i-tetraplex formation (in the sense strand) and its effect on duplex formation. We found that i-tetraplex formation was destabilized by approximately 1.4 kcal/mol (DeltaDeltaG at 20 degrees C, pH 5.8). Observed hysteresis allowed us to analyze the kinetics of folding for the mutant (M3). Though we observed higher association (DeltaEon approximately -23.4 kcal/mol) and dissociation (DeltaEoff approximately 22.1 kcal/mol) activation energies (at pH 5.3) for the wild-type (P1) tetraplex folding, the kinetics of folding and unfolding for M3 was somewhat faster at pH 5.3 and 5.8. Interestingly, Surface plasmon resonance (BIAcore) analysis of hybridization at pH 6.6 indicated a higher association constant for M3 (approximately 22.5 x 10(4)M(-1)s(-1)) than P1 (approximately 3.2 x 10(4)M(-1)s(-1)). The equilibrium dissociation constants also indicated favorable duplex association for M3 (approximately 22.2 and approximately 190.6 nM for M3 and P1, respectively). We envisage that the increased affinity for the duplex state due to the mutation could play a functional role in the aberrant regulation of c-myc." @default.
• W2007965495 created "2016-06-24" @default.
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• W2007965495 date "2005-02-01" @default.
• W2007965495 modified "2023-10-12" @default.
• W2007965495 title "Quadruplex–duplex competition in the nuclease hypersensitive element of human c-myc promoter: C to T mutation in C-rich strand enhances duplex association" @default.
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• W2007965495 doi "https://doi.org/10.1016/j.bbrc.2004.11.137" @default.
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