2002 Fiscal Year Final Research Report Summary
Design and synthesis of DNA topoisomerase II inhibitors targeting the proton-transfer process
| Project/Area Number |
12470476
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Chemical pharmacy
|
|---|
| Research Institution | KYOTO UNIVERSITY |
|---|
Principal Investigator |
IIDA Akira Kyoto University, Graduate School of Pharmaceutical Sciences, Associate Professor, 薬学研究科, 助教授 (40202816)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Keywords | topoisomerase II / inhibitor / nucleoside / DNA cleeavage complex / molecular design / proton trap / compound library / structure-activity relationship |
|---|
| Research Abstract |
DNA topoisomerases are nuclear enzymes responsible for biological processes of DNA metabolism such as replication, transcription, recombination and chromosome segregation at mitosis. Therefore, compounds that inhibit these enzymes as the primary cellular target are of special interest since those are promising candidates for anticancer drugs.
Our previous studies demonstrated that the ortho-quinone or catechol moiety in aza-deoxypodophyllotoxin analogues plays a critical role in showing topoisomerase II (topo II) enzyme inhibition, in which proton transport during cutting and resealing of DNA is presumed to be blocked by a small structural unit like ortho-quinone. In this research project, we have aimed at the synthesis and biological evaluation of nucleoside analogues as novel topo II inhibitors that are hybrids with aza-podophyllotoxin analogues. Our synthesis contains a Michael addition reaction of 1, 3-dithianes to chiral butenolide, an equivalent to the deoxyribose moiety of a nucleoside, and a Silyl-Hilbert-Johnson reaction as key reactions. As predicted, ortho-quinone and catechol showed topo II inhibition, while dimethoxy derivative was inactive. In addition to the active nucleosides, it was found that several lactone derivatives lacking a thymine base also inhibited topo II, indicating that a thymine base is not requisite to topo II inhibition. Structure-activity relationship of these lactone derivatives showed that the presence of the TBS group or dithiane moiety in the molecule is essential for topo II inhibition in the case of non-nucleoside derivatives.
|
