Chlamydiae have been known for more than a century as major pathogens of humans. Yet
they are also found ubiquitously in the environment where they thrive within protists and in …

The Chlamydiales order is composed of obligate intracellular bacteria and includes the
Chlamydiaceae family and several family-level lineages called Chlamydia-related bacteria …

The obligate intracellular human pathogen Chlamydia trachomatis (Ctr) undergoes a
complex developmental cycle in which the bacterium differentiates between two functionally …

This paper provides an overview of the current knowledge of chlamydiae. These intracellular
microorganisms belonging to the Chlamydiaceae family are widely distributed throughout …

Chlamydia trachomatis is a developmentally regulated, obligate intracellular bacterium that
encodes three sigma factors: σ66, σ54, and σ28. σ66 is the major sigma factor controlling …

The Chlamydiae phylum exclusively encompasses bacteria sharing a similar obligate
intracellular life cycle. Existing 16S rDNA data support a high diversity within the phylum …

The plastid originated 1.5 billion years ago through a primary endosymbiosis involving a
heterotrophic eukaryote and an ancient cyanobacterium. Phylogenetic and biochemical …

Background Chlamydia are ancient intracellular pathogens with reduced, though strikingly
conserved genome. Despite their parasitic lifestyle and isolated intracellular environment …

The trp operon of Chlamydia trachomatis is organized differently from other model bacteria.
It contains trpR, an intergenic region (IGR), and the biosynthetic trpB and trpA open-reading …

A transcription factor (TF) is a protein that regulates gene expression by interacting with the
RNA polymerase, another TF, and/or template DNA. GrgA is a novel transcription activator …