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Cytoplasm from unfertilized eggs of the frog Xenopus laevis was separated by DEAE-cellulose column chromatography into nine fractions. Supercoiled pXir 11 DNA molecules (pXir 11 is a Col El-based recombinant plasmid containing part of the Xenopus laevis 18S and 28S ribosomal genes and transcribed spacer region) were incubated with each fraction singly and in various combinations. After incubation for 4 hr at 26 degrees C, the pXir 11 DNA was reisolated and examined by electron microscopy. Using appropriate reaction conditions (pH 7.2, 10 mM Mg2+, 250 micron NTP, 50 50 micron dNTP, 50 MM KCl, fractions III and IV or VI), at least 5-10% of the input DNA was converted to theta structures (presumed intermediates in DNA replication).
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