Thiadiazole: A new family of intercalative photonuclease with electron transfer and radical mechanisms
摘要:
A new family of photonuclease, thiadiazole-naphthalimide were synthesized and evaluated. Thiadiazole group was incorporated for the first time. These compounds intercalated into DNA efficiently and damaged DNA as low as 10 muM photochemically. Mechanism experiment showed that electron transfer and radicals were involved. (C) 2003 Elsevier Ltd. All rights reserved.
Thio-heterocylic naphthalimides with aminoalkyl side chains: novel alternative tools for photodegradation of genomic DNA without impairment on bioactivities of proteins
作者:Qing Yang、Xuhong Qian、Jianqiang Xu、Yuanshe Sun、Yonggang Li
DOI:10.1016/j.bmc.2004.12.012
日期:2005.3.1
Thio-heterocylic naphthalimides (R1-R5) were designed, synthesized and evaluated as nonmetallic and long-wavelength photocleavers. Some of them showed highly efficient abilities in the degradation of plasmid and genomic DNA under the mild conditions without obvious impairment on the proteins' bioactivities, when compared with frequently applied nucleic acids removal reagents or precipitants. Their differences in photodegradation selectivity to DNA rather than proteins were dependent on their photodamage mechanisms and binding modes with bio-macromolecules. When maize genomic DNA was used as substrate, 2.38 x 10(-4) M of R5 exhibited the nuclease activity of 8 Unit DNase 1, R5 has some characteristic as a typical catalyst as no consumption after two cycles of the photodegradation for DNA. The experiments of enzymatic activity assay and immunology activity analysis showed that R5 was safe to proteins, suggesting its potential in the removal of transgenic material during the preparation of bioactive proteins or enzyme preparations. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of thiazo- or thiadiazo- naphthalene carboxamides via mercuric intermediates and their antitumor and DNA photocleavage activities
作者:Zhigang Li、Qing Yang、Xuhong Qian
DOI:10.1016/j.tet.2005.03.135
日期:2005.7
Two kinds of thiazo- or thiadiazo- naphthalene carboxamides with aminoalkyl side chains at 5- or 6-position modified from naphthalimides were designed, synthesized and quantitatively evaluated as antitumor and DNA photocleaving agents. The compound with aminoalkyl side chain at 6-position showed stronger antitumor (A549, P388) and DNA photocleaving abilities than its isomer with that at 5-position. B-2, the most efficient DNA photocleaver, also exhibited the highest cytotoxicity with the IC50 of 2.53 and 0.11 mu M against cell lines of A549 and P388, respectively. These compounds also photocleaved DNA more efficiently than their corresponding naphthalimides. (c) 2005 Elsevier Ltd. All rights reserved.