Structural highlights
Function[HFQ_PSEAE] RNA chaperone that binds small regulatory RNA (sRNAs) and mRNAs to facilitate mRNA translational regulation in response to envelope stress, environmental stress and changes in metabolite concentrations. Also binds with high specificity to tRNAs (By similarity). Publication Abstract from PubMedIn diverse bacterial species, the global regulator Hfq contributes to post-transcriptional networks that control expression of numerous genes. Hfq of the opportunistic pathogen Pseudomonas aeruginosa inhibits translation of target transcripts by forming a regulatory complex with the catabolite repression protein Crc. This repressive complex acts part of an intricate mechanism of preferred nutrient utilisation. We describe high-resolution cryo-EM structures of the assembly of Hfq and Crc bound to the translation initiation site of a target mRNA. The core of the assembly is formed through interactions of two cognate RNAs, two Hfq hexamers and a Crc pair. Additional Crc protomers are recruited to the core to generate higher-order assemblies with demonstrated regulatory activity in vivo. This study reveals how Hfq cooperates with a partner protein to regulate translation, and provides a structural basis for an RNA code that guides global regulators to interact cooperatively and regulate different RNA targets. Architectural principles for Hfq/Crc-mediated regulation of gene expression.,Pei XY, Dendooven T, Sonnleitner E, Chen S, Blasi U, Luisi BF Elife. 2019 Feb 13;8. pii: 43158. doi: 10.7554/eLife.43158. PMID:30758287[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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