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Single-Strand DNA Intermediates in Phage λ 's Red Recombination Pathway
Ist Teil von
Proceedings of the National Academy of Sciences - PNAS, 1997-04, Vol.94 (7), p.2951-2956
Ort / Verlag
National Academy of Sciences of the United States of America
Erscheinungsjahr
1997
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
An assay was developed to assess early intermediates arising in λ 's Red recombination pathway. Double-strand breaks were delivered in vivo to nonreplicating λ chromosomes. Analysis by blot hybridization of total DNA extracts revealed the following: (i) long (>1.4 kilobases) single-strand DNA (ssDNA) intermediates; (ii) resection proceeding bidirectionally from the break site; (iii) single-strand overhangs of 3′polarity; and (iv) in the absence of λ 's ninR functions, a requirement of the redα gene product for the production of ssDNA. Therefore, the physical characteristics exhibited by these ssDNA molecules are consistent with their being an early recombination intermediate in the Red recombination pathway as proposed previously from genetic and in vitro biochemical analyses.