title: Isolation and propagation of a segment of the simian virus 40 genome containing the origin of DNA replication.
abstract: Heteroduplex DNA molecules formed from two DNAs that differ from each other by a deletion can be cleaved at the mismatched region (a deletion loop) with the single-strand-specific S1 endonuclease. A heteroduplex DNA molecule, constructed from the DNA of simian  virus 40 (SV40) mutant with a deletion of the map region 0.54-0.55 and the DNA of a second SV40 mutant having a deletion of the map segment  0.70-0.73, is cleaved twice with S1 endonuclease. One of the products is a DNA fragment of about 0.13 the length of SV40 DNA which contains the origin of SV40 DNA replication (0.67 on the SV40 DNA map).
mesh_terms: D004261:DNA Replication; D004270:DNA, Circular / Q000096:biosynthesis; D004279:DNA, Viral / Q000096:biosynthesis / Q000302:isolation & purification*; D013539:Simian virus 40 / Q000032:analysis / Q000378:metabolism*
chemical_list: D004270:DNA, Circular; D004279:DNA, Viral