The sequence of the gene encoding elongation factor Tu from Chlamydia trachomatis compared with those of other organisms

Gene. 1992 Oct 12;120(1):33-41. doi: 10.1016/0378-1119(92)90006-b.


Nucleotide (nt) sequences encoding the elongation factor Tu (EF-Tu), tRNA(Thr) and tRNA(Trp) from Chlamydia trachomatis have been determined. The environment of the EF-Tu-encoding gene (tuf), between two tRNA gene sequences, suggests that it is part of a tufB locus. The nt sequence and the deduced amino acid (aa) sequence were aligned with comparable sequences from other organisms and the resulting data bases were used to infer phylogenies. Phylogenetic trees based on aa sequences and nt sequences are similar, but not completely congruent with rRNA gene-based phylogenies. Both the nt and aa sequence trees concur on the early divergence of Thermotoga and Chlamydia from the bacterial root. The aa alignment highlights the presence of four unique Cys residues in the chlamydial sequence which are found at strictly conserved positions in other sequences. Further peculiarities of the chlamydial and eubacterial sequences have been mapped to the X-ray crystallographic structure of the protein.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Bacterial Proteins / chemistry
  • Bacterial Proteins / genetics*
  • Base Sequence
  • Biological Evolution
  • Chlamydia trachomatis / genetics*
  • Gram-Negative Anaerobic Bacteria / genetics
  • Models, Molecular
  • Molecular Sequence Data
  • Peptide Elongation Factor Tu / chemistry
  • Peptide Elongation Factor Tu / genetics*
  • Phylogeny
  • Sequence Alignment
  • Sequence Homology


  • Bacterial Proteins
  • Peptide Elongation Factor Tu

Associated data

  • GENBANK/M74221
  • GENBANK/M79310
  • GENBANK/X65053
  • GENBANK/X65107
  • GENBANK/X65108
  • GENBANK/X65109
  • GENBANK/X65110
  • GENBANK/X65111
  • GENBANK/X65112
  • GENBANK/X65113