The CrP operon of Chlamydia psittaci and Chlamydia pneumoniae

Article Abstract:

The obligate pathogenic bacteria Chlamydia psittaci and Chlamydia pneumoniae contain the 9 kDa cysteine-rich protein (CrP) gene upstream from the 60 kDa CrP gene. A monocistronic stimulus induces the transcription of the 9 kDa CrP gene. A bicistronic stimulus induces the transcription of both the genes. Transcription by these stimuli is controlled by one promoter but the termination points are different. The transcription of these genes increases as the bacteria change from the replicative form to the infective form. The structure of the 9 kDa CrP gene is similar to that of C. trachomatis.

Observations, Genetic transcription, Operons, Transcription (Genetics), Amino acid sequence, Amino acid sequencing

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Plasmid diversity in Chlamydia

Article Abstract:

Southern blot analysis and restriction enzyme profiling were conducted on the plasmids of Chlamydia trachomatis, Chlamydia psittaci and Chlamydia pneumoniae to determine the complete nucleotide sequences of these plasmids. Comparison of the sequence data reveals a consistent genomic arrangement comprising eight major ORFs and four 22 bp tandem repeats. Furthermore, results suggest that the plasmids have arisen by evolution from a common ancestor.

Plasmids, Homology (Biology)

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A 28 kDa major immunogen of Chlamydia psittaci shares identity with Mip proteins of Legionella spp. and Chlamydia trachomatis - cloning and characterization of the C. psittaci mip-like gene

Article Abstract:

Sera from recovering guinea pigs infected with Chlamydia psittaci-caused guinea-pig inclusion conjunctivitis (GPIC) were utilized for identifying from a lambda expression library two overlapping GPIC genome clones that generate the 28 kDa antigenic protein. The gene coding the antigenic protein was found to be similar to the macrophage infectivity potentiator genes from Legionella pneumophila and Chlamydia trachomatis.

Chlamydia trachomatis, Legionella pneumophila, Bacterial antigens, O antigens

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