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Publication Abstract from PubMed

In 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.