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- W2108462810 abstract "ABSTRACT We report on the identification and first cloning of an autonomously replicating sequence element from the chromosome of an archaeon, the extreme halophile Halobacterium strain NRC-1. The putative replication origin was identified by association with the orc7 gene and replication ability in the host strain, demonstrated by cloning into a nonreplicating plasmid. Deletion analysis showed that sequences located up to 750 bp upstream of the orc7 gene translational start, plus the orc7 gene and 50 bp downstream, are sufficient to endow the plasmid with replication ability, as judged by expression of a plasmid-encoded mevinolin resistance selectable marker and plasmid recovery after transformation. Sequences located proximal to the two other chromosomally carried haloarchaeal orc genes ( orc6 and orc8 ) are not able to promote efficient autonomous replication. Located within the 750-bp region upstream of orc7 is a nearly perfect inverted repeat of 31 bp, which flanks an extremely AT-rich (44%) stretch of 189 bp. The replication ability of the plasmid was lost when one copy of the inverted repeat was deleted. Additionally, the inverted repeat structure near orc7 homologs in the genomic sequences of two other halophiles, Haloarcula marismortui and Haloferax volcanii , is highly conserved. Our results indicate that, in halophilic archaea, a chromosomal origin of replication is physically linked to orc7 homologs and that this element is sufficient to promote autonomous replication. We discuss the finding of a functional haloarchaeal origin in relation to the large number of orc1 - cdc6 homologs identified in the genomes of all haloarchaea to date." @default.
- W2108462810 created "2016-06-24" @default.
- W2108462810 creator A5026657416 @default.
- W2108462810 creator A5031584276 @default.
- W2108462810 date "2003-10-15" @default.
- W2108462810 modified "2023-09-26" @default.
- W2108462810 title "An Archaeal Chromosomal Autonomously Replicating Sequence Element from an Extreme Halophile, <i>Halobacterium</i> sp. Strain NRC-1" @default.
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- W2108462810 doi "https://doi.org/10.1128/jb.185.20.5959-5966.2003" @default.
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