Mol. Gen. Genet.

The replication origin and both terminal segments were cloned from the large linear plasmid pSLA2-L in Streptomyces rochei 7434AN4. The basic replicon consists of a 1.9-kb DNA fragment, which contains the genetic information required for autonomous replication in circular form. Sequence analysis revealed two ORFs, RepL1 and RepL2, with no similarity to any of the replication initiator proteins in the database. Deletion and mutational analysis showed that RepL1 is essential for replication and RepL2 has a subsidiary function. The origin of replication may be located 800 bp upstream of repL1. Sequencing of the left and right terminal segments revealed the presence of 12 palindromes. The sequence of the first 90 bp, including palindromes I-IV, shows great similarity to that of other Streptomyces linear chromosomes and plasmids. These results suggest that the internal replication origins of the linear replicons vary widely, in contrast to the high degree of conservation of their telomeres.

Source:http://purl.uniprot.org/citations/10954087

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Subject	Predicate
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