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Cleavage of pBR322 DNA I by the restriction endonuclease HinfI is preferentially inhibited at specific HinfI cleavage sites. These sites in pBR322 DNA I have been identified and ordered with respect to the frequency with which they are cleaved. The HinfI site most resistant to cleavage in pBR322 DNA I is unique in that runs of G-C base pairs are immediately adjacent on both sites. Two differently permuted linear (DNA III) species were produced by cleavage with two different restriction endonucleases, PstI and AvaI. Only one of these linear molecules, that produced by PstI, exhibits the same preferential cleavage pattern as DNA I. The second linear species, that arising from AvaI digestion, shows pronounced relative inhibition of cleavage at the HinfI sites nearest the ends of the molecule (100 to 120 base pairs away, respectively). This result suggest that proximity to the termini of a linear DNA molecule might also influence preferential cleavage. The possibility of formation of stem-loop structures does not appear to influence preferential cleavage by HinfI.

Site-dependent cleavage of pBR322 DNA by restriction endonucleaseHinfI