Saffran W A, Goldenberg M, Cantor C R
Proc Natl Acad Sci U S A. 1982 Aug;79(15):4594-8. doi: 10.1073/pnas.79.15.4594.
A technique has been developed for placing site-specific crosslinks into DNA by using a psoralen derivative containing a sulfhydryl group. Plasmid pBR322 was nicked at the unique BamHI restriction site, and mercurated pyrimidines were introduced by nick-translation. Then the psoralen was specifically directed to this site in the dark through a Hg-S linkage prior to irradiation to form a crosslink. The location of interstrand cross-links was examined by electron microscopy of Pst I-cut molecules and found to be at or near the BamHI site.
已开发出一种通过使用含巯基的补骨脂素衍生物将位点特异性交联引入DNA的技术。质粒pBR322在独特的BamHI限制性位点处产生切口,并通过切口平移引入汞化嘧啶。然后在照射形成交联之前,补骨脂素在黑暗中通过Hg-S键被特异性地导向该位点。通过对Pst I切割分子的电子显微镜检查来检测链间交联的位置,发现其位于BamHI位点处或附近。