Structural insights into RapZ-mediated regulation of bacterial amino-sugar metabolism.Gonzalez, G.M., Durica-Mitic, S., Hardwick, S.W., Moncrieffe, M.C., Resch, M., Neumann, P., Ficner, R., Gorke, B., Luisi, B.F.
(2017) Nucleic Acids Res. 45: 10845-10860
- PubMed: 28977623
- DOI: 10.1093/nar/gkx732
- Primary Citation of Related Structures:
- PubMed Abstract:
In phylogenetically diverse bacteria, the conserved protein RapZ plays a central role in RNA-mediated regulation of amino-sugar metabolism. RapZ contributes to the control of glucosamine phosphate biogenesis by selectively presenting the regulatory s ...
In phylogenetically diverse bacteria, the conserved protein RapZ plays a central role in RNA-mediated regulation of amino-sugar metabolism. RapZ contributes to the control of glucosamine phosphate biogenesis by selectively presenting the regulatory small RNA GlmZ to the essential ribonuclease RNase E for inactivation. Here, we report the crystal structures of full length Escherichia coli RapZ at 3.40 Å and 3.25 Å, and its isolated C-terminal domain at 1.17 Å resolution. The structural data confirm that the N-terminal domain of RapZ possesses a kinase fold, whereas the C-terminal domain bears closest homology to a subdomain of 6-phosphofructokinase, an important enzyme in the glycolytic pathway. RapZ self-associates into a domain swapped dimer of dimers, and in vivo data support the importance of quaternary structure in RNA-mediated regulation of target gene expression. Based on biochemical, structural and genetic data, we suggest a mechanism for binding and presentation by RapZ of GlmZ and the closely related decoy sRNA, GlmY. We discuss a scenario for the molecular evolution of RapZ through re-purpose of enzyme components from central metabolism.
Georg-August University Göttingen, Department of Molecular Structural Biology Justus von Liebig Weg 11, D-37077 Göttingen, Germany.,Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1GA, UK.,Department of Microbiology, Immunology and Genetics, Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter, 1030 Vienna, Austria.