FIG. 1.

Genomic region containing ftsZ and dnaA in Prochlorococcus sp. strain PCC 9511. (A) The dnaA gene is framed by four putative genes, ORF1 to ORF4, close homologues of which reside at corresponding sites in P. marinus sp. strain SS120 (30). (B) Organization of the ftsZ locus. The numbers designate putative gene start and stop codons (GenBank accession no. AJ011025 for ftsZ and AF158628 for dnaA). Genetic symbols are as follows: ddlB, d-alanine—d-alanine ligase; ftsQ, filamentous temperature-sensitive Q; ftsZ, filamentous temperature-sensitive Z; panB, 3-methyl-2-oxobutanoate hydroxymethyltransferase; and hemN, oxygen-independent coproporphyrinogen III oxidase. The locations of antisense RNA probes used in the expression analysis are indicated by arrows.