Download MendeleyStructure of the Escherichia coli ProQ RNA-binding protein.
Gonzalez, G.M., Hardwick, S.W., Maslen, S.L., Skehel, J.M., Holmqvist, E., Vogel, J., Bateman, A., Luisi, B.F., Broadhurst, R.W.(2017) RNA 23: 696-711
- PubMed: 28193673
- DOI: https://doi.org/10.1261/rna.060343.116
- Primary Citation of Related Structures:
5NB9, 5NBB - PubMed Abstract:
The protein ProQ has recently been identified as a global small noncoding RNA-binding protein in Salmonella , and a similar role is anticipated for its numerous homologs in divergent bacterial species. We report the solution structure of Escherichia coli ProQ, revealing an N-terminal FinO-like domain, a C-terminal domain that unexpectedly has a Tudor domain fold commonly found in eukaryotes, and an elongated bridging intradomain linker that is flexible but nonetheless incompressible. Structure-based sequence analysis suggests that the Tudor domain was acquired through horizontal gene transfer and gene fusion to the ancestral FinO-like domain. Through a combination of biochemical and biophysical approaches, we have mapped putative RNA-binding surfaces on all three domains of ProQ and modeled the protein's conformation in the apo and RNA-bound forms. Taken together, these data suggest how the FinO, Tudor, and linker domains of ProQ cooperate to recognize complex RNA structures and serve to promote RNA-mediated regulation.
Organizational Affiliation:
Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom.
