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- W277636414 abstract "An acid site-specific endonuclease has been detected in mature sea urchin eggs and cells of embryos at early stages of differentiation. Fractionation with ammonium sulfate, followed by chromatography on columns with DEAE, phosphocellulose, and hydroxyapatite resulted in an 18,000-fold purification. The molecular weight of the enzyme was determined at approx. 29,000, the optimum pH 5.5. The activity of the enzyme does not depend on divalent metal ions, EDTA, ATP, and tRNA, but it is modulated to a substantial degree by NaCl. The maximum rate of cleavage of the DNA supercoil (form I) is observed at 100 mM NaCl. Increasing the NaCl concentration to 350 mM only slightly lowers the rate of cleavage of form I, yielding form II, but entirely suppresses the accumulation of form III. Restriction analysis of the products of enzymatic hydrolysis of Co1E1 and pBR322 DNA showed that at the early stages of hydrolysis the enzyme exhibits pronounced specificity for definite sites, the number of which is 12 for Co1 E1 DNA and 8 sites for pBR322 DNA." @default.
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- W277636414 date "1986-01-10" @default.
- W277636414 modified "2023-09-26" @default.
- W277636414 title "Isolation and properties of the acid site-specific endonuclease from mature eggs of the sea urchin Strongylocentrotus intermedius" @default.
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