Structure of ribosomal protein TL5 complexed with RNA provides new insights into the CTC family of stress proteins

Research output: Contribution to journalArticle


The crystal structure of Thermus thermophilus ribosomal protein TL5 in complex with a fragment of Escherichia coli 5S rRNA has been determined at 2.3 Å resolution. The protein consists of two domains. The structure of the N-terminal domain is close to the structure of E. coli ribosomal protein L25, but the C-terminal domain represents a new fold composed of seven -strands connected by long loops. TL5 binds to the RNA through its N-terminal domain, whereas the C-terminal domain is not included in this interaction. Cd2+ ions, the presence of which improved the crystal quality significantly, bind only to the protein component of the complex and stabilize the protein molecule itself and the interactions between the two molecules in the asymmetric unit of the crystal. The TL5 sequence reveals homology to the so-called general stress protein CTC. The hydrophobic cores which stabilize both TL5 domains are highly conserved in CTC proteins. Thus, all CTC proteins may fold with a topology close to that of TL5.


  • R V Fedorov
  • V A Meshcheryakov
  • G M Gongadze
  • N P Fomenkova
  • N A Nevskaya N A
  • Maria Selmer
  • Martin Laurberg
  • Ole Kristensen
  • Salam Al-Karadaghi
  • Anders Liljas
  • Marina Garber
  • S Nikonov
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Structural Biology


  • general stress protein CTC, protein-RNA complex, cadmium ions
Original languageEnglish
Pages (from-to)968-976
JournalActa Crystallographica. Section D: Biological Crystallography
Issue number7
Publication statusPublished - 2001
Publication categoryResearch