期刊
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
卷 1, 期 9, 页码 636-640出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b202028a
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We used a XeCl excimer laser with 50 ns pulses, a frequency of 0.3 Hz and a wavelength of 308 nm in appropriate conditions for the photocrosslinking of EcoRII restriction endonuclease to a 14-mer DNA duplex, containing a 5-iodo-2'-deoxyuridine residue (IdU). IdU replaced the thymidine residue within the EcoRII recognition sequence 5'-CCT/AGG. The binding of EcoRII endonuclease to the IdU-containing DNA duplex was analyzed by gel retardation assay in the presence of Ca2+ or Mg2+ ions. Photocrosslinking of EcoRII to the IdU-containing DNA duplex occurred in a pre-reactive complex formed in the presence of Ca2+ ions. Photocrosslinking yields as a function of time and UV-laser light intensity were studied.
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