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- W2146854211 abstract "The minimal replication origin (ori) of the plasmid pSC101 was defined as an about 220-bp region under the condition that the Rep (or RepA) protein, a plasmid-encoded initiator protein, was supplied in trans. The DnaA box is located at one end of ori, as in other plasmids, like mini-F and P1. The other border is a strong binding site (IR-1) of Rep which is palindromic sequence and lies in an about 50-bp region beyond the repeated sequences (iterons) in ori. This IR-1 is located just upstream of another strong Rep binding site (IR-2), the operator site of the structure gene of Rep (rep), but its function has not been determined. The present study shows that the IR-1 sequence capable of binding to Rep is essential for plasmid replication with a nearly normal copy number. Furthermore, a region between the third iteron and IR-1 is also required in a sequence-specific fashion, since some one-base substitution in this region inactivate the origin function. It is likely that the region also is a recognition site of an unknown protein. Three copy number mutations of rep can suppress any one-base substitution mutation. On the other hand, the sequence of a spacer region between the second and the third iterons, which is similar to that of the downstream region of the third iteron, can be changed without loss of the origin function. The requirement of the region downstream of iterons in pSC101 seems to be unique among iteron-driven plasmid replicons." @default.
- W2146854211 created "2016-06-24" @default.
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- W2146854211 date "1993-09-01" @default.
- W2146854211 modified "2023-09-25" @default.
- W2146854211 title "Minimal essential origin of plasmid pSC101 replication: requirement of a region downstream of iterons" @default.
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- W2146854211 doi "https://doi.org/10.1128/jb.175.18.5993-6001.1993" @default.
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