Table 1. General features of chlamydial genomes.
| C.caviae | C.muridarum | C.trachomatis (serovar D) | C.pneumoniae (AR39) | |
|---|---|---|---|---|
| Chromosome (nt) | 1 173 390 | 1 072 950 | 1 042 519 | 1 229 858 |
| Plasmid/*phage (nt) | 7966 | 7501 | 7493 | *4524 |
| GC (%) | 39.2 | 40.3 | 41.3 | 40.6 |
| Total ORFs | 1009 | 921 | 894 | 1130 |
| Conserved hypothetical (%) | 320 (31.7) | 281 (30.5) | nda | 285 (25.2) |
| Hypothetical (%) | 84 (8.3) | 77 (8.3) | nd | 263 (23.2)b |
| tRNAs | 38 | 37 | 37 | 38 |
| rRNA operons | 1 | 2 | 2 | 1 |
| Amino acid biosynthesis | 19 | 15 | nd | 14 |
| Purine, pyrimidine, nucleoside and nucleotide metabolism | 17 | 15 | nd | 16 |
| Fatty acid and phospholipid metabolism | 22 | 24 | nd | 24 |
| Biosynthesis of cofactors, prosthetic groups and carriers | 41 | 36 | nd | 41 |
| Central intermediary metabolism | 12 | 12 | nd | 13 |
| Energy metabolism | 60 | 64 | nd | 65 |
| Transport and binding proteins | 61 | 58 | nd | 61 |
| DNA metabolism | 56 | 53 | nd | 51 |
| Transcription | 22 | 23 | nd | 23 |
| Protein synthesis | 100 | 100 | nd | 101 |
| Protein fate | 49 | 58 | nd | 63 |
| Regulatory functions | 18 | 15 | nd | 15 |
| Cell envelope | 54 | 43 | nd | 61 |
| Cellular processes | 45 | 36 | nd | 35 |
| Other | 0 | 0 | nd | 2 |
aTIGR role categories are not assigned to genomes not sequenced at TIGR.
bHigher as C.pneumoniae was annotated before C.caviae.