Abstract
The nucleotide sequence of nearly 6 kb of genomic DNA located immediately upstream of the omp3-omp2 operon of Chlamydia psittaci strain GPIC was obtained, revealing four significant open reading frames (ORFs), named ORF1, ORF2, ORF4 and ORF5. Searches for homologous sequences in the GenBank/EMBL databases have revealed that: (a) the open-ended ORF1 putatively encodes an homolog of RecJ of Escherichia coli, thought to be required for RecBCD-independent and conjugational recombination, and for UV repair; (b) the predicted translation product of ORF4 is highly homologous to the putative product of EUO, a previously described ORF of avian C. psittaci strain 6BC which is preferentially transcribed early during the life cycle; and (c) ORF5 putatively encodes an homolog of bacterial glutamyl-tRNA synthetases. This analysis establishes the genetic linkage of late ( omp3-omp2) and of a proposed early (EUO) genes in Chlamydia
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