Sm-Like Proteins in Eubacteria: The Crystal Structure of the Hfq Protein from Escherichia ColiSauter, C., Basquin, J., Suck, D.
(2003) Nucleic Acids Res 31: 4091
- PubMed: 12853626
- DOI: 10.1093/nar/gkg480
- Primary Citation of Related Structures:
- PubMed Abstract:
- The Sm-Like Hfq Protein Increases Oxys RNA Interaction with Target Mrnas
Zhang, A., Wassarman, K.M., Ortega, J., Steven, A.C., Storz, G.
(2002) Mol Cell 9: 11
- Hfq: A Bacterial Sm-Like Protein that Mediates RNA-RNA Interaction
Moller, T., Franch, T., Hojrup, P., Keene, D.R., Bachinger, H.P., Brennan, R.G., Valentin-Hansen, P.
(2002) Mol Cell 9: 23
- Structures of the Pleiotropic Translational Regulator Hfq and an Hfq-RNA Complex: A Bacterial Sm-Like Protein
Schumacher, M.A., Pearson, R.F., Moller, T., Valentin-Hansen, P., Brennan, R.G.
(2002) EMBO J 21: 3546
- Characterization of Broadly Pleiotropic Phenotypes Caused by an Hfq Insertion Mutation in Escherichia Coli K-12
Tsui, H.C., Leung, H.C., Winkler, M.E.
(1994) Mol Microbiol 13: 35
- Bacterial Proteins Required for Replication of Phage Q Ribonucleic Acid. Purification and Properties of Host Factor I, a Ribonucleic Acid-Binding Protein
De Fernandez, M.T.F., Hayward, W.S., August, J.T.
(1972) J Biol Chem 247: 824
The Hfq protein was discovered in Escherichia coli in the early seventies as a host factor for the Qbeta phage RNA replication. During the last decade, it was shown to be involved in many RNA processing events and remote sequence homology indicated a link to spliceosomal Sm proteins ...
The Hfq protein was discovered in Escherichia coli in the early seventies as a host factor for the Qbeta phage RNA replication. During the last decade, it was shown to be involved in many RNA processing events and remote sequence homology indicated a link to spliceosomal Sm proteins. We report the crystal structure of the E.coli Hfq protein showing that its monomer displays a characteristic Sm-fold and forms a homo-hexamer, in agreement with former biochemical data. Overall, the structure of the E.coli Hfq ring is similar to the one recently described for Staphylococcus aureus. This confirms that bacteria contain a hexameric Sm-like protein which is likely to be an ancient and less specialized form characterized by a relaxed RNA binding specificity. In addition, we identified an Hfq ortholog in the archaeon Methanococcus jannaschii which lacks a classical Sm/Lsm gene. Finally, a detailed structural comparison shows that the Sm-fold is remarkably well conserved in bacteria, Archaea and Eukarya, and represents a universal and modular building unit for oligomeric RNA binding proteins.
European Molecular Biology Laboratory, Structural and Computational Biology Programme, Meyerhofstrasse 1, D-69117 Heidelberg, Germany.