Abstract
In order to investigate the recognition mechanism and the relationship between structure and function of minihelix DNA with Tryptophanyl-tRNA Synthetase (TrpRS), TrpRS fromBacillus Subtilis was purified. Four minihelix DNAs were chemically synthesized and the photoreactive reagent s4T was incorporated into three of them at the positions of G73, T72 and T55 corresponding to tRNATrp. The apparatus for uv crosslinking was devised and the parameters for uv crosslinking were optimized. The results indicated that the G73 and T72 base of minihelix DNA interacted with TrpRS directly. The uv crosslinking reaction was improved by the dose of uv irradiation and the concentration of both TrpRS and minihelix DNA.
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