Synthesis of new 13-diphenylalkyl analogues of berberine and elucidation of their base pair specificity and energetics of DNA binding
摘要:
设计并合成了一系列 13-二苯基烷基小檗碱衍生物,并使用一种天然 DNA 多核苷酸和两种合成 DNA 多核苷酸评估了它们的碱基特异性和 DNA 结合能。生物物理评估结果表明,在小檗碱的 13 位添加二苯基烷基链可显著提高与 DNA 的结合能力。结合结果清楚地表明,与交替的 GC 序列相比,类似物更倾向于交替的 AT 序列。在所有情况下,结合亲和力随着链长的增加而增强,直到临界长度(CH2)3,之后结合亲和力下降。结果还表明,这些小檗碱类似物具有腺嘌呤-胸腺嘧啶(AT)碱基特异性,异喹啉发色团 13 位侧链的长度是调节结合亲和力的关键。
Organocatalytic reductive coupling of aldehydes with 1,1-diarylethylenes using an <i>in situ</i> generated pyridine-boryl radical
作者:Jia Cao、Guoqiang Wang、Liuzhou Gao、Xu Cheng、Shuhua Li
DOI:10.1039/c7sc05225a
日期:——
reductive couplingreaction of aldehydes with 1,1-diarylethylenes has been established via a combination of computational and experimental studies. Density functional theory calculations and control experiments suggest that the ketyl radical from the addition of the pyridine-boryl radical to aldehydes is the key intermediate for this C–C bond formation reaction. This metal-free reductive coupling reaction
A series of 13-diphenylalkyl berberine derivatives were designed and synthesized, and their base specificity and energetics of DNA binding were evaluated using one natural and two synthetic DNA polynucleotides. Biophysical evaluation demonstrated that the addition of the diphenylalkyl chain at the 13-position of berberine significantly improved the binding ability to DNA. The binding clearly revealed the high preference of the analogues to the alternating AT sequences compared to the alternating GC sequences. The binding affinity was enhanced with the increase in chain length up to a critical length of (CH2)3 in all the cases, after which the binding affinity decreased. Analogue BR4 had the best affinity for DNA, which corresponds to a length of (CH2)3. The results also suggested the adenine-thymine (AT) base specificity of these berberine analogues and that the length of the side chain at the 13-position of the isoquinoline chromophore is critical in modulating the binding affinity.
设计并合成了一系列 13-二苯基烷基小檗碱衍生物,并使用一种天然 DNA 多核苷酸和两种合成 DNA 多核苷酸评估了它们的碱基特异性和 DNA 结合能。生物物理评估结果表明,在小檗碱的 13 位添加二苯基烷基链可显著提高与 DNA 的结合能力。结合结果清楚地表明,与交替的 GC 序列相比,类似物更倾向于交替的 AT 序列。在所有情况下,结合亲和力随着链长的增加而增强,直到临界长度(CH2)3,之后结合亲和力下降。结果还表明,这些小檗碱类似物具有腺嘌呤-胸腺嘧啶(AT)碱基特异性,异喹啉发色团 13 位侧链的长度是调节结合亲和力的关键。