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
- Also Cited By: 2Y90, 2YHT
- PubMed Abstract:
- Characterization of Broadly Pleiotropic Phenotypes Caused by an Hfq Insertion Mutation in Escherichia Coli K-12
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- The Sm-Like Hfq Protein Increases Oxys RNA Interaction with Target Mrnas
Zhang, A.,Wassarman, K.M.,Ortega, J.,Steven, A.C.,Storz, G.
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- Structures of the Pleiotropic Translational Regulator Hfq and an Hfq-RNA Complex: A Bacterial Sm-Like Protein
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- 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
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 ...
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.