PROBING THE STRUCTURE OF A PUTATIVE INTERMEDIATE IN HOMOLOGOUS RECOMBINATION - THE THIRD STRAND IN THE PARALLEL DNA TRIPLEX IS IN CONTACT WITH THE MAJOR GROOVE OF THE DUPLEX

摘要

A three-stranded DNA that is a putative intermediate of homologous recombination is a novel DNA tripler, R-form DNA. In R-form DNA the third strand includes both purines and pyrimidines and is parallel to the identical strand of the duplex. To test and refine our previously proposed R-form base triplets we have used two approaches: (1) dimethyl sulfate protection of R-form DNA; and (2) thermal dissociation of R-form DNAs in which the duplex strands were substituted in a strand-specific manner with either 7-deaza-guanine or 7-deaza-adenine. Together, the footprinting and isosteric substitution results demonstrate that the third strand in R-form DNA is in contact with the purines in the N-7 position in the major groove of the Watson-Crick duplex in three ((GC):G, (AT):A and (TA):T) out of the four possible triplets. Furthermore, these results suggest that the N-7 positions of the duplex play a significant role in stabilizing the DNA-DNA contacts during the homology recognition process. [References: 52]