作者:Ivan D. Kozekov、Lubomir V. Nechev、M. Scott Moseley、Constance M. Harris、Carmelo J. Rizzo、Michael P. Stone、Thomas M. Harris
DOI:10.1021/ja020778f
日期:2003.1.1
3-(2-deoxy-beta-d-erythro-pentofuranosyl)-5,6,7,8-tetrahydro-8-(N(2)-2'-deoxyguanosinyl)pyrimido[1,2-a]purin-10(3H)one (5a) and reduction with NaCNBH(3) followed by enzymatic digestion to give 1,3-bis(2'-deoxyguanosin-N(2)-yl)propane (6a) established that cross-linking had occurred with the exocyclic amino group of deoxyguanosine. It is concluded that the cross-link is a mixture of imine and carbinolamine structures
丙烯醛和更高的 α,β-不饱和醛是双功能基因毒素。丙烯醛的脱氧鸟苷加合物,3-(2-deoxy-beta-d-erythro-pentofuranosyl)-5,6,7,8-tetrahydro-8-hydroxypyrimido[1,2-a]purin-10(3H)-one (8-hydroxy-1,N(2)-propanodeoxyguanosine, 2a) 是由丙烯醛形成的主要 DNA 加合物。通过 HPLC、CZE、MALDI-TOF 和熔解现象评估含有 2a 的寡脱氧核苷酸双链体形成链间交联的潜力。链间交联是 DNA 中最严重的损伤类型之一,因为它们是复制的绝对障碍。在包含序列 5'-dC-2a 的寡聚脱氧核苷酸中,交联以缓慢、可逆的方式发生到大约 50% 的程度。酶消化形成 3-(2-deoxy-beta-d-erythro-pentofuranosyl)-5,6,7,8-t