Sequence analysis of the genome of the unicellular cyanobacterium Synechocystis sp. strain PCC6803. I. Sequence features in the 1 Mb region from map positions 64% to 92% of the genome - PubMed (original) (raw)

. 1995 Aug 31;2(4):153-66, 191-8.

doi: 10.1093/dnares/2.4.153.

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• PMID: 8590279
• DOI: 10.1093/dnares/2.4.153

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Sequence analysis of the genome of the unicellular cyanobacterium Synechocystis sp. strain PCC6803. I. Sequence features in the 1 Mb region from map positions 64% to 92% of the genome

T Kaneko et al. DNA Res. 1995.

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Abstract

The contiguous sequence of 1,003,450 bp spanning map positions 64% to 92% of the genome of Synechocystis sp. strain PCC6803 has been deduced. Computer analysis of the sequence predicts that this region contains at least 818 potential ORFs, in which 255 (31%) were either genes that had already been identified or their homologues, 84 (10%) were homologues to registered hypothetical genes, and 149 (18%) showed weak similarities to reported genes. The remaining 330 ORFs showed no apparent similarity to any reported genes or carried no significant protein motifs. The potential ORFs as a whole occupied 86% of the sequenced region, implying compact arrangement of genes in the genome. As to the structural RNA genes, one rRNA operon consisting of 5,028 bp and at least 11 species of tRNA genes were identified. It is noteworthy that 10 out of the 11 tRNA species showed significant sequence similarities to tRNAs reported in plant chloroplasts. As other notable unique sequences, three classes of IS-like elements each with characteristics typical of IS elements were identified, and a typical unit of WD(Trp-Asp)-repeats which have only been detected in the regulatory proteins of eukaryotes was identified within the large 5,079-bp ORF located at map position 69%.

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