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The second zinc finger fragment of Sp1 (Spl-ZF2), its mutant (Spl-ZF2/HT. E20→H, R23→T), and two mimic analogues (ZF20 and ZF15) were synthesized by stepwise solid phase technique. The CD spectra and UV-visible spectrum with CoCl2 indicated that the formation of zinc finger structure was affected not only by the hy-drophobic amino acids but also by the change of the distance between Cys and His. Gel-retardation electrophoresis as-says indicated that the Grlu and Arg residues are very important for recognition. A single zinc finger like Spl-ZF2 isable to bind DNA sequence specifically. 相似文献
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