Contact with the CsrA Core Is Required for Allosteric Inhibition by FliW in Bacillus subtilis
The RNA-binding protein CsrA is a posttranscriptional regulator encoded by genomes throughout the bacterial phylogeny. In the gammaproteobacteria, the activity of CsrA is inhibited by small RNAs that competitively sequester CsrA binding. In contrast, the firmicute encodes a protein inhibitor of CsrA...
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Published in | Journal of bacteriology Vol. 203; no. 2; pp. 1 - 15 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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American Society for Microbiology
18.12.2020
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Abstract | The RNA-binding protein CsrA is a posttranscriptional regulator encoded by genomes throughout the bacterial phylogeny. In the gammaproteobacteria, the activity of CsrA is inhibited by small RNAs that competitively sequester CsrA binding. In contrast, the firmicute
encodes a protein inhibitor of CsrA called FliW, which noncompetitively inhibits CsrA activity but for which the precise mechanism of antagonism is unclear. Here, we take an unbiased genetic approach to identify residues of FliW important for CsrA inhibition and these residues fall into two distinct spatial and functional classes. Most loss-of-function alleles mutated FliW residues surrounding the critical regulatory CsrA residue N55 and abolished interaction between the two proteins. Two loss-of-function alleles, however, mutated FliW residues near the CsrA core dimerization domain and maintained interaction with CsrA. One of the FliW alleles reversed a residue charge to disrupt a salt bridge with the CsrA core, and a compensatory charge reversal in the CsrA partner residue restored both the salt bridge and antagonism. We propose a model in which the initial interaction between FliW and CsrA is necessary but not sufficient for antagonism, and for which salt bridge formation with, and deformation of, the CsrA core domain is likely required to allosterically abolish RNA-binding activity.
CsrA is a small dimeric protein that binds RNA and is one of the few known examples of transcript-specific protein regulators of translation in bacteria. A protein called FliW binds to and antagonizes CsrA to govern flagellin homeostasis and flagellar assembly. Despite having a high-resolution three-dimensional structure of the FliW-CsrA complex, the mechanism of noncompetitive inhibition remains unresolved. Here, we identify FliW residues required for antagonism and we find that the residues make a linear connection in the complex from initial binding interaction with CsrA to a critical salt bridge near the core of the CsrA dimer. We propose that the salt bridge represents an allosteric contact that distorts the CsrA core to prevent RNA binding. |
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AbstractList | CsrA is a small dimeric protein that binds RNA and is one of the few known examples of transcript-specific protein regulators of translation in bacteria. A protein called FliW binds to and antagonizes CsrA to govern flagellin homeostasis and flagellar assembly. Despite having a high-resolution three-dimensional structure of the FliW-CsrA complex, the mechanism of noncompetitive inhibition remains unresolved. Here, we identify FliW residues required for antagonism and we find that the residues make a linear connection in the complex from initial binding interaction with CsrA to a critical salt bridge near the core of the CsrA dimer. We propose that the salt bridge represents an allosteric contact that distorts the CsrA core to prevent RNA binding.
The RNA-binding protein CsrA is a posttranscriptional regulator encoded by genomes throughout the bacterial phylogeny. In the gammaproteobacteria, the activity of CsrA is inhibited by small RNAs that competitively sequester CsrA binding. In contrast, the firmicute
Bacillus subtilis
encodes a protein inhibitor of CsrA called FliW, which noncompetitively inhibits CsrA activity but for which the precise mechanism of antagonism is unclear. Here, we take an unbiased genetic approach to identify residues of FliW important for CsrA inhibition and these residues fall into two distinct spatial and functional classes. Most loss-of-function alleles mutated FliW residues surrounding the critical regulatory CsrA residue N55 and abolished interaction between the two proteins. Two loss-of-function alleles, however, mutated FliW residues near the CsrA core dimerization domain and maintained interaction with CsrA. One of the FliW alleles reversed a residue charge to disrupt a salt bridge with the CsrA core, and a compensatory charge reversal in the CsrA partner residue restored both the salt bridge and antagonism. We propose a model in which the initial interaction between FliW and CsrA is necessary but not sufficient for antagonism, and for which salt bridge formation with, and deformation of, the CsrA core domain is likely required to allosterically abolish RNA-binding activity.
IMPORTANCE
CsrA is a small dimeric protein that binds RNA and is one of the few known examples of transcript-specific protein regulators of translation in bacteria. A protein called FliW binds to and antagonizes CsrA to govern flagellin homeostasis and flagellar assembly. Despite having a high-resolution three-dimensional structure of the FliW-CsrA complex, the mechanism of noncompetitive inhibition remains unresolved. Here, we identify FliW residues required for antagonism and we find that the residues make a linear connection in the complex from initial binding interaction with CsrA to a critical salt bridge near the core of the CsrA dimer. We propose that the salt bridge represents an allosteric contact that distorts the CsrA core to prevent RNA binding. The RNA-binding protein CsrA is a posttranscriptional regulator encoded by genomes throughout the bacterial phylogeny. In the gammaproteobacteria, the activity of CsrA is inhibited by small RNAs that competitively sequester CsrA binding. In contrast, the firmicute Bacillus subtilis encodes a protein inhibitor of CsrA called FliW, which noncompetitively inhibits CsrA activity but for which the precise mechanism of antagonism is unclear. Here, we take an unbiased genetic approach to identify residues of FliW important for CsrA inhibition and these residues fall into two distinct spatial and functional classes. Most loss-of-function alleles mutated FliW residues surrounding the critical regulatory CsrA residue N55 and abolished interaction between the two proteins. Two loss-of-function alleles, however, mutated FliW residues near the CsrA core dimerization domain and maintained interaction with CsrA. One of the FliW alleles reversed a residue charge to disrupt a salt bridge with the CsrA core, and a compensatory charge reversal in the CsrA partner residue restored both the salt bridge and antagonism. We propose a model in which the initial interaction between FliW and CsrA is necessary but not sufficient for antagonism, and for which salt bridge formation with, and deformation of, the CsrA core domain is likely required to allosterically abolish RNA-binding activity. IMPORTANCE CsrA is a small dimeric protein that binds RNA and is one of the few known examples of transcript-specific protein regulators of translation in bacteria. A protein called FliW binds to and antagonizes CsrA to govern flagellin homeostasis and flagellar assembly. Despite having a high-resolution three-dimensional structure of the FliW-CsrA complex, the mechanism of noncompetitive inhibition remains unresolved. Here, we identify FliW residues required for antagonism and we find that the residues make a linear connection in the complex from initial binding interaction with CsrA to a critical salt bridge near the core of the CsrA dimer. We propose that the salt bridge represents an allosteric contact that distorts the CsrA core to prevent RNA binding. The RNA-binding protein CsrA is a posttranscriptional regulator encoded by genomes throughout the bacterial phylogeny. In the gammaproteobacteria, the activity of CsrA is inhibited by small RNAs that competitively sequester CsrA binding. In contrast, the firmicute encodes a protein inhibitor of CsrA called FliW, which noncompetitively inhibits CsrA activity but for which the precise mechanism of antagonism is unclear. Here, we take an unbiased genetic approach to identify residues of FliW important for CsrA inhibition and these residues fall into two distinct spatial and functional classes. Most loss-of-function alleles mutated FliW residues surrounding the critical regulatory CsrA residue N55 and abolished interaction between the two proteins. Two loss-of-function alleles, however, mutated FliW residues near the CsrA core dimerization domain and maintained interaction with CsrA. One of the FliW alleles reversed a residue charge to disrupt a salt bridge with the CsrA core, and a compensatory charge reversal in the CsrA partner residue restored both the salt bridge and antagonism. We propose a model in which the initial interaction between FliW and CsrA is necessary but not sufficient for antagonism, and for which salt bridge formation with, and deformation of, the CsrA core domain is likely required to allosterically abolish RNA-binding activity. CsrA is a small dimeric protein that binds RNA and is one of the few known examples of transcript-specific protein regulators of translation in bacteria. A protein called FliW binds to and antagonizes CsrA to govern flagellin homeostasis and flagellar assembly. Despite having a high-resolution three-dimensional structure of the FliW-CsrA complex, the mechanism of noncompetitive inhibition remains unresolved. Here, we identify FliW residues required for antagonism and we find that the residues make a linear connection in the complex from initial binding interaction with CsrA to a critical salt bridge near the core of the CsrA dimer. We propose that the salt bridge represents an allosteric contact that distorts the CsrA core to prevent RNA binding. |
Author | Dunn, Caroline M Kearns, Daniel B Oshiro, Reid T |
Author_xml | – sequence: 1 givenname: Reid T orcidid: 0000-0002-8419-1048 surname: Oshiro fullname: Oshiro, Reid T organization: Department of Biology, Indiana University, Bloomington, Indiana, USA – sequence: 2 givenname: Caroline M surname: Dunn fullname: Dunn, Caroline M organization: Department of Biology, Indiana University, Bloomington, Indiana, USA – sequence: 3 givenname: Daniel B orcidid: 0000-0002-3460-8378 surname: Kearns fullname: Kearns, Daniel B email: dbkearns@indiana.edu organization: Department of Biology, Indiana University, Bloomington, Indiana, USA dbkearns@indiana.edu |
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DocumentTitleAlternate | Residues of FliW Required for CsrA Antagonism, Oshiro et al Residues of FliW Required for CsrA Antagonism |
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Keywords | flagella motility RsmA FliW CsrA |
Language | English |
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Snippet | The RNA-binding protein CsrA is a posttranscriptional regulator encoded by genomes throughout the bacterial phylogeny. In the gammaproteobacteria, the activity... CsrA is a small dimeric protein that binds RNA and is one of the few known examples of transcript-specific protein regulators of translation in bacteria. A... |
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SubjectTerms | Alleles Allosteric properties Amino Acid Sequence Antagonism Bacillus subtilis Bacillus subtilis - drug effects Bacillus subtilis - genetics Bacillus subtilis - physiology Bacterial Proteins - chemistry Bacterial Proteins - genetics Bacterial Proteins - pharmacology Bacteriology Charge reversal Dimerization Dimers Domains Flagella Flagellin Genomes Homeostasis Loss of Function Mutation - genetics Phylogeny Post-transcription Protein Conformation Proteins Regulators Repressor Proteins - antagonists & inhibitors Repressor Proteins - chemistry Repressor Proteins - genetics Repressor Proteins - metabolism Research Article Residues Ribonucleic acid RNA RNA, Bacterial - metabolism RNA-binding protein RNA-Binding Proteins - antagonists & inhibitors RNA-Binding Proteins - chemistry RNA-Binding Proteins - genetics RNA-Binding Proteins - metabolism Salts Spotlight |
Title | Contact with the CsrA Core Is Required for Allosteric Inhibition by FliW in Bacillus subtilis |
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