1887

Abstract

Chlamydiae are major human and animal pathogens. Based on alignments of different protein sequences, a number of conserved indels (insertion/deletions) were identified that appear to be unique and distinctive characteristics of the chlamydial species. The identified signatures include one 16 aa and two single aa inserts in the enzyme UDP--acetylglucosamine 1-carboxyvinyltransferase (MurA), a 1 aa insert in protein synthesis elongation factor P (EF-P), a 1 aa insert in the Mg transport protein (MgtE), a 1 aa insert in the carboxy-terminal protease and a 1 aa deletion in the tRNA (guanine- -)-methyltransferase (TrmD) protein. The homologues of these proteins are found in all major groups of bacteria and the observed indels are present in all available chlamydial sequences but not in any other species (except for the large insert in MurA in ). The validity of three of these signatures (MurA, EF-P and MgtE) was tested by PCR amplifying the signature regions from several chlamydial species for which no sequence information was available. All species for which specific fragments could be amplified (, , , ) contained the expected signatures. Additionally, a fragment of the gene from and the gene from , two chlamydia-like species, were also cloned and sequenced. The presence of respective indels in these species provides strong evidence that they are specifically related to the traditional chlamydial species, and that these signatures may be distinctive of the entire order. A 17 aa conserved indel was also identified in the cell wall biosynthesis enzyme UDP--acetylglucosamine pyrophosphorylase (GlmU), which is shared by all archaeal and chlamydial homologues. The gene for this protein is indicated to have been horizontally transferred from an archaeon to a common ancestor of the chlamydiae. The results also support a lateral transfer of the gene between chlamydiae and . The large inserts in these peptidoglycan synthesis related genes in chlamydiae could account for their unusual cell-wall characteristics. These signatures are also potentially useful for screening of the chlamydiae species.

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2002-08-01
2019-12-07
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