Genetic structure of the dnaA region of the cyanobacterium Synechocystis sp. strain PCC6803.
We have cloned and sequenced the dnaA region of Synechocystis sp. strain PCC6803, a bacterium with a light-dependent cell cycle. The dnaA gene product, DnaA, is the central factor for replication initiation in bacteria. The deduced amino acid sequence of the protein encoded by the cyanobacterial dnaA gene is 45% identical to DnaA of Bacillus subtilis and fits very well into the homology pattern of the known eubacterial DnaA proteins. The genetic environment of the Synechocystis sp. strain PCC6803 dnaA gene is completely different from the one in other eubacteria. An open reading frame of unknown function, orf134, was detected upstream of dnaA. The purT gene homolog encoding the glycinamide ribonucleotide transformylase T starts about 200 bp away from this open reading frame in the opposite direction. Downstream of the dnaA gene we detected the start of the psbDC operon, which codes for the photosystem II reaction center proteins D2 and CP43 that are involved in the positioning of chlorophyll a.
Richter
S
S
Max-Planck-Institut für molekulare Genetik, Berlin-Dahlem, Germany.
Messer
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W
D000217:Acyltransferases / Q000096:biosynthesis / Q000235:genetics; D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000235:genetics; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics*; D001483:Base Sequence; D000458:Cyanobacteria / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D019877:Hydroxymethyl and Formyl Transferases; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D009876:Operon; D051026:Phosphoribosylglycinamide Formyltransferase; D011687:Purines / Q000096:biosynthesis; D017386:Sequence Homology, Amino Acid
D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; C066312:DnaA protein, Bacteria; D029968:Escherichia coli Proteins; D011687:Purines; D019877:Hydroxymethyl and Formyl Transferases; C494825:purT protein, E coli; D051026:Phosphoribosylglycinamide Formyltransferase; D000217:Acyltransferases