Synthesis, Electrochemistry, and Bioactivity of the Cyanobacterial Calothrixins and Related Quinones
作者:Paul H. Bernardo、Christina L. L. Chai、Graham A. Heath、Peter J. Mahon、Geoffrey D. Smith、Paul Waring、Bronwyn A. Wilkes
DOI:10.1021/jm049625o
日期:2004.9.1
biological activity. In particular, the reduction potentials of the calothrixins and some related quinones were measured electrochemically. Our studies indicate that while there is no direct correlation between the reduction potentials and biological activities of the studied compounds, in all cases quinones with EC(50) values <1.6 microM undergo reduction to their respective semiquinones readily, with
杯状毒素是从蓝藻中分离出的基于醌的天然产物,其对几种癌细胞系显示出有效的抗增殖特性。初步的机理研究表明,花环毒素的生物学作用方式可能与其经历氧化还原循环的能力有关。在这项研究中,我们比较了Calothrixins的生物活性和与结构相关的醌的生物活性,以鉴定Calothrixins中对生物活性必不可少的结构特征。特别地,用电化学方法测量了花丝氨酸毒素和一些相关醌的还原电势。我们的研究表明,虽然还原电位与所研究化合物的生物学活性之间没有直接关系,但在所有情况下,醌类的EC(50)值<1。