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. 1973 Feb;113(2):754–762. doi: 10.1128/jb.113.2.754-762.1973

Chromatographically Fractionated Complementary Strands of Bacillus subtilis Deoxyribonucleic Acid: Transformation of Hybrids

Rivka Rudner 1, Virgilija Remeza 1
PMCID: PMC285290  PMID: 4347926

Abstract

The annealing properties as measured by the restoration of transforming activity and hypochromicity of methylated albumin-kieselguhr (MAK)-fractionated complementary strands of Bacillus subtilis deoxyribonucleic acid (DNA) are presented. Temperature-absorbance measurements performed on annealed mixtures of various L and H strand fractions indicated the existence of a complementarity gradient between the two MAK peaks. The markers purA16, leu-8, metB5, thr-5, and the linked marker hisB2-try-2 exhibited different bimodal distributions on MAK columns. The transforming efficiency of heteroduplex mixtures, prepared by cross-annealing resolved complementary strands of wild-type and recipient DNA, was compared. The transforming efficiency of the wild-type L and H strands was equal in one preparation and unequal in a second preparation. It was found that in the second strand preparation the heteroduplex DNA containing the H strand from wild type was more efficient for all of the markers tested. The variations in transforming efficiencies of the complementary strands in heteroduplex molecules reported here and by others are due in part to strands of unequal length and probably to the self-annealing property of the H strands. At present, no conclusion could be made regarding the existence of strand selection bias during integration of donor DNA in competent B. subtilis cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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