Journal Article

Nucleotide Sequence of Plasmid pAQ1 of Marine Cyanobacterium <i>Synechococcus</i> sp. PCC7002

Hideo Akiyama, Shozo Kanai, Masahiko Hirano and Hitoshi Miyasaka

in DNA Research

Published on behalf of Kazusa DNA Research Institute

Volume 5, issue 2, pages 127-129
Published in print January 1998 | ISSN: 1340-2838
Published online January 1998 | e-ISSN: 1756-1663 | DOI: http://dx.doi.org/10.1093/dnares/5.2.127

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We have determined the complete nucleotide sequence of pAQ1, the smallest plasmid of the unicellular marine cyanobacterium Synechococcus sp. PCC7002. The plasmid consists of 4,809 bp and has at least four open reading frames that potentially encode polypeptides of 50 or more amino acids. We found that a palindromic element, the core sequence of which is G(G/A)CGATCGCC, is over-represented not only in plasmid pAQ1 but also in the accumulated cyanobacterial genomic sequences from Synechococcus sp. PCC6301, PCC7002, PCC7942, vulcanus and Synechocystis sp. PCC6803 within GenBank and EMBL databases. It suggests that this sequence might mediate gene rearrangement, thus increasing genetic diversity, since recombination events are frequent in cyanobacteria.

Keywords: plasmid pAQ1; replication origin; palindromic element; highly iterated palindrome (HIP); Synechococcus sp. PCC7002

Journal Article.  0 words. 

Subjects: Genetics and Genomics

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