skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Recognition of U-rich RNA by Hfq from the Gram-positive pathogen Listeria monocytogenes

Journal Article · · RNA

Hfq is a post-transcriptional regulator that binds U- and A-rich regions of sRNAs and their target mRNAs to stimulate their annealing in order to effect translation regulation and, often, to alter their stability. The functional importance of Hfq and its RNA-binding properties are relatively well understood in Gram-negative bacteria, whereas less is known about the RNAbinding properties of this riboregulator in Gram-positive species. Here, we describe the structure of Hfq from the Grampositive pathogen Listeria monocytogenes in its RNA-free form and in complex with a U6 oligoribonucleotide. As expected, the protein takes the canonical hexameric toroidal shape of all other known Hfq structures. The U6 RNA binds on the “proximal face” in a pocket formed by conserved residues Q9, N42, F43, and K58. Additionally residues G5 and Q6 are involved in protein-nucleic and inter-subunit contacts that promote uracil specificity. Unlike Staphylococcus aureus (Sa) Hfq, Lm Hfq requires magnesium to bind U6 with high affinity. In contrast, the longer oligo-uridine, U16, binds Lm Hfq tightly in the presence or absence of magnesium, thereby suggesting the importance of additional residues on the proximal face and possibly the lateral rim in RNA interaction. Lastly, intrinsic tryptophan fluorescence quenching (TFQ) studies reveal, surprisingly, that Lm Hfq can bind (GU)3G and U6 on its proximal and distal faces, indicating a less stringent adenine-nucleotide specificity site on the distal face as compared to the Gram-positive Hfq proteins from Sa and Bacillus subtilis and suggesting as yet uncharacterized RNA-binding modes on both faces.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US National Institutes of Health (NIH)
Grant/Contract Number:
W-31-109-Eng-38
OSTI ID:
1253794
Journal Information:
RNA, Vol. 20, Issue 10; ISSN 1355-8382
Publisher:
Cambridge University PressCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

References (48)

PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
Electrostatics of nanosystems: Application to microtubules and the ribosome journal August 2001
iMOSFLM : a new graphical interface for diffraction-image processing with MOSFLM journal March 2011
Staphylococcus aureus RNAIII coordinately represses the synthesis of virulence factors and the transcription regulator Rot by an antisense mechanism journal June 2007
The role of Hfq in bacterial pathogens journal February 2010
Identification of small Hfq-binding RNAs in Listeria monocytogenes journal May 2006
The CCP4 suite programs for protein crystallography journal September 1994
Crystal structure of a heptameric Sm-like protein complex from archaea: implications for the structure and evolution of snRNPs journal June 2001
Association of RNAs with Bacillus subtilis Hfq journal February 2013
Hfq is essential for Vibrio cholerae virulence and downregulates σE expression: Role of Hfq in V. cholerae virulence and σE expression journal May 2004
Coot model-building tools for molecular graphics journal November 2004
The RNA Chaperone Hfq Is Involved in Stress Response and Virulence in Neisseria meningitidis and Is a Pleiotropic Regulator of Protein Expression journal February 2009
Inhibition of rot translation by RNAIII, a key feature of agr function journal August 2006
The small untranslated RNA SR1 from the Bacillus subtilis genome is involved in the regulation of arginine catabolism: Small RNA SR1 from B. subtilis involved in arginine catabolism journal September 2006
In vitro analysis of the interaction between the small RNA SR1 and its primary target ahrC mRNA journal June 2007
Structural mechanism of Staphylococcus aureus Hfq binding to an RNA A-tract journal September 2012
Staphylococcus aureus RNAIII and the endoribonuclease III coordinately regulate spa gene expression journal January 2005
Crystal Structures of Two Sm Protein Complexes and Their Implications for the Assembly of the Spliceosomal snRNPs journal February 1999
Structure of Escherichia coli Hfq bound to polyriboadenylate RNA journal November 2009
Hfq Is a Global Regulator That Controls the Pathogenicity of Staphylococcus aureus journal September 2010
Identification of new noncoding RNAs in Listeria monocytogenes and prediction of mRNA targets journal January 2007
Solving structures of protein complexes by molecular replacement with Phaser journal December 2006
Hfq journal January 2002
The crystal structure of a heptameric archaeal Sm protein: Implications for the eukaryotic snRNP core journal May 2001
Identification of a σ B -Dependent Small Noncoding RNA in Listeria monocytogenes journal September 2008
Defining a role for Hfq in Gram-positive bacteria: evidence for Hfq-dependent antisense regulation in Listeria monocytogenes journal November 2009
Despite Similar Binding to the Hfq Protein Regulatory RNAs Widely Differ in Their Competition Performance journal May 2011
NMRPipe: A multidimensional spectral processing system based on UNIX pipes journal November 1995
Conserved arginines on the rim of Hfq catalyze base pair formation and exchange journal June 2013
CodY Activates Transcription of a Small RNA in Bacillus subtilis journal September 2009
Mapping Hfq-RNA interaction surfaces using tryptophan fluorescence quenching journal November 2013
Structural basis for RNA 3′-end recognition by Hfq journal July 2011
Structures of the pleiotropic translational regulator Hfq and an Hfq-RNA complex: a bacterial Sm-like protein journal July 2002
The RNA chaperone Hfq is essential for the virulence of Salmonella typhimurium journal January 2007
Crystal structure of Hfq from Bacillus subtilis in complex with SELEX-derived RNA aptamer: insight into RNA-binding properties of bacterial Hfq journal November 2011
Controlling mRNA stability and translation with small, noncoding RNAs journal April 2004
Predicted structure and phyletic distribution of the RNA-binding protein Hfq journal September 2002
The Listeria transcriptional landscape from saprophytism to virulence journal May 2009
RNA binding in an Sm core domain: X-ray structure and functional analysis of an archaeal Sm protein complex journal May 2001
Characterization of broadly pleiotropic phenotypes caused by an hfq insertion mutation in Escherichia coli K-12 journal July 1994
The bacterial Sm-like protein Hfq: a key player in RNA transactions journal February 2004
Stoichiometry of the Sm proteins in yeast spliceosomal snRNPs supports the heptamer ring model of the core domain11Edited by T. Richmond journal April 2001
Cooperation of Escherichia coli Hfq hexamers in DsrA binding journal October 2011
Hfq-bridged ternary complex is important for translation activation of rpoS by DsrA journal April 2013
Identification of novel small RNAs using comparative genomics and microarrays journal July 2001
Impact of the RNA chaperone Hfq on multidrug resistance in Escherichia coli journal March 2010
The OxyS regulatory RNA represses rpoS translation and binds the Hfq (HF-I) protein journal October 1998
The Sm-like Hfq Protein Increases OxyS RNA Interaction with Target mRNAs journal January 2002

Cited By (16)

RNA-binding proteins involved in post-transcriptional regulation in bacteria journal March 2015
Hfq chaperone brings speed dating to bacterial sRNA journal April 2018
Mycobacterium tuberculosis 6C sRNA binds multiple mRNA targets via C-rich loops independent of RNA chaperones journal March 2019
Caulobacter crescentus Hfq structure reveals a conserved mechanism of RNA annealing regulation. text January 2019
Acidic C-terminal domains autoregulate the RNA chaperone Hfq journal August 2017
Hfq: a multifaceted RNA chaperone involved in virulence journal January 2016
Crystal structure and RNA-binding properties of an Hfq homolog from the deep-branching Aquificae: conservation of the lateral RNA-binding mode journal March 2017
Target activation by regulatory RNAs in bacteria journal May 2015
Characterization of RNA-binding properties of the archaeal Hfq-like protein from Methanococcus jannaschii text January 2016
Crystal structure and RNA-binding properties of an Hfq homolog from the deep-branching Aquificae: Conservation of the lateral RNA-binding mode journal October 2016
Characterization of RNA-binding properties of the archaeal Hfq-like protein from Methanococcus jannaschii journal July 2016
Caulobacter crescentus Hfq structure reveals a conserved mechanism of RNA annealing regulation journal May 2019
ProQ/FinO-domain proteins: another ubiquitous family of RNA matchmakers?: New family of RNA matchmakers journal May 2017
Characterization of RNA-binding properties of the archaeal Hfq-like protein from Methanococcus jannaschii text January 2016
Multicomponent mixtures for cryoprotection and ligand solubilization journal September 2015
Epitope determination of immunogenic proteins of Neisseria gonorrhoeae journal July 2017