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International Journal of Biological Macromolecules 2018-Sep

Study on antitumor molecular mechanism of Alisols based on p53DNA.

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Fei Xu
Cai Lu
Qinan Wu
Jun Chen
Wei Gu
Wenjia Du
Min You

キーワード

概要

Methyl thiazolyl tetrazolium (MTT) assay, UV-vis absorption spectroscopy, fluorescence spectroscopy and molecular simulation were used to investigate the antitumor activity of alisol A, alisol B and an 1:1 mixture of both compounds, the mechanism of its interaction with anti-cancer target p53DNA and explored the antitumor mechanism of alisols. MTT assay showed that the order of antitumor activity was:alisol B > alisol A > alisol A-alisol B(1:1). Spectroscopic experiments and molecular simulation suggested that alisol A, alisol B and their mixture interact with p53DNA in by partial insertion and the strength of binding affinity was consistent with the MTT assay. The Ksv of alisol A was 9.35 × 104 L·mol-1, Kq was 9.35 × 1012 L·mol-1·s-1 and the Ksv and Kq of alisol B were 11.61 × 104 L·mol-1 and 11.61 × 1012 L·mol-1·s-1. The molecular simulation revealed that competitive antagonism was observed in the interaction between the alisol mixture and p53DNA. The critical groups and significant binding sites for the interaction between alisol monomers and p53DNA include C19-OH and C22-OH of the alisols; N2 and H21 of the guanine deoxynucleotide (DG8), N2-H21 of the DG7, O4' of the DG9 in the f-chain of p53DNA; and C2-O2 of the cytosine deoxynucleotide (DC16) in the e-chain of p53DNA. Also, the C-22 and C23- of the alisols and the DA18-DT5 base pairs of p53DNA were key factors in the interaction of the mixture with p53DNA.

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