Structure of the Escherichia coli response regulator NarL
The crystal structure analysis of the NarL protein provides a first look at interactions between receiver and effector domains of a full-length bacterial response regulator. The N-terminal receiver domain, with 131 amino acids, is folded into a 5-strand beta sheet flanked by 5 alpha helices, as seen...
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| Published in: | Biochemistry (Easton) Vol. 35; no. 34; p. 11053 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
27.08.1996
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| Subjects: | |
| ISSN: | 0006-2960 |
| Online Access: | Get more information |
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| Abstract | The crystal structure analysis of the NarL protein provides a first look at interactions between receiver and effector domains of a full-length bacterial response regulator. The N-terminal receiver domain, with 131 amino acids, is folded into a 5-strand beta sheet flanked by 5 alpha helices, as seen in CheY and in the N-terminal domain of NTRC. The C-terminal DNA-binding domain, with 62 amino acids, is a compact bundle of 4 alpha helices, of which the middle 2 form a helix-turn-helix motif closely related to that of Drosophila paired protein and other H-T-H DNA-binding proteins. The 2 domains are connected by an alpha helix of 10 amino acids and a 13-residue flexible tether that is not visible and presumably disordered in the X-ray structure. In this unphosphorylated form of NarL, the C-terminal domain is turned against the receiver domain in a manner that would preclude DNA binding. Activation of NarL via phosphorylation of Asp59 must involve transfer of information to the interdomain interface and either rotation or displacement of the DNA-binding C-terminal domain. Docking of a B-DNA duplex against the isolated C-terminal domain in the manner observed in paired protein and other H-T-H proteins suggests a stereochemical basis for DNA sequence preference: T-R-C-C-Y (high affinity) or T-R-C-T-N (low affinity), which is close to the experimentally observed consensus sequence: T-A-C-Y-N. The NarL structure is a model for other members of the FixJ or LuxR family of bacterial transcriptional activators, and possibly to the more distant OmpR and NtrC families as well. |
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| AbstractList | The crystal structure analysis of the NarL protein provides a first look at interactions between receiver and effector domains of a full-length bacterial response regulator. The N-terminal receiver domain, with 131 amino acids, is folded into a 5-strand beta sheet flanked by 5 alpha helices, as seen in CheY and in the N-terminal domain of NTRC. The C-terminal DNA-binding domain, with 62 amino acids, is a compact bundle of 4 alpha helices, of which the middle 2 form a helix-turn-helix motif closely related to that of Drosophila paired protein and other H-T-H DNA-binding proteins. The 2 domains are connected by an alpha helix of 10 amino acids and a 13-residue flexible tether that is not visible and presumably disordered in the X-ray structure. In this unphosphorylated form of NarL, the C-terminal domain is turned against the receiver domain in a manner that would preclude DNA binding. Activation of NarL via phosphorylation of Asp59 must involve transfer of information to the interdomain interface and either rotation or displacement of the DNA-binding C-terminal domain. Docking of a B-DNA duplex against the isolated C-terminal domain in the manner observed in paired protein and other H-T-H proteins suggests a stereochemical basis for DNA sequence preference: T-R-C-C-Y (high affinity) or T-R-C-T-N (low affinity), which is close to the experimentally observed consensus sequence: T-A-C-Y-N. The NarL structure is a model for other members of the FixJ or LuxR family of bacterial transcriptional activators, and possibly to the more distant OmpR and NtrC families as well.The crystal structure analysis of the NarL protein provides a first look at interactions between receiver and effector domains of a full-length bacterial response regulator. The N-terminal receiver domain, with 131 amino acids, is folded into a 5-strand beta sheet flanked by 5 alpha helices, as seen in CheY and in the N-terminal domain of NTRC. The C-terminal DNA-binding domain, with 62 amino acids, is a compact bundle of 4 alpha helices, of which the middle 2 form a helix-turn-helix motif closely related to that of Drosophila paired protein and other H-T-H DNA-binding proteins. The 2 domains are connected by an alpha helix of 10 amino acids and a 13-residue flexible tether that is not visible and presumably disordered in the X-ray structure. In this unphosphorylated form of NarL, the C-terminal domain is turned against the receiver domain in a manner that would preclude DNA binding. Activation of NarL via phosphorylation of Asp59 must involve transfer of information to the interdomain interface and either rotation or displacement of the DNA-binding C-terminal domain. Docking of a B-DNA duplex against the isolated C-terminal domain in the manner observed in paired protein and other H-T-H proteins suggests a stereochemical basis for DNA sequence preference: T-R-C-C-Y (high affinity) or T-R-C-T-N (low affinity), which is close to the experimentally observed consensus sequence: T-A-C-Y-N. The NarL structure is a model for other members of the FixJ or LuxR family of bacterial transcriptional activators, and possibly to the more distant OmpR and NtrC families as well. The crystal structure analysis of the NarL protein provides a first look at interactions between receiver and effector domains of a full-length bacterial response regulator. The N-terminal receiver domain, with 131 amino acids, is folded into a 5-strand beta sheet flanked by 5 alpha helices, as seen in CheY and in the N-terminal domain of NTRC. The C-terminal DNA-binding domain, with 62 amino acids, is a compact bundle of 4 alpha helices, of which the middle 2 form a helix-turn-helix motif closely related to that of Drosophila paired protein and other H-T-H DNA-binding proteins. The 2 domains are connected by an alpha helix of 10 amino acids and a 13-residue flexible tether that is not visible and presumably disordered in the X-ray structure. In this unphosphorylated form of NarL, the C-terminal domain is turned against the receiver domain in a manner that would preclude DNA binding. Activation of NarL via phosphorylation of Asp59 must involve transfer of information to the interdomain interface and either rotation or displacement of the DNA-binding C-terminal domain. Docking of a B-DNA duplex against the isolated C-terminal domain in the manner observed in paired protein and other H-T-H proteins suggests a stereochemical basis for DNA sequence preference: T-R-C-C-Y (high affinity) or T-R-C-T-N (low affinity), which is close to the experimentally observed consensus sequence: T-A-C-Y-N. The NarL structure is a model for other members of the FixJ or LuxR family of bacterial transcriptional activators, and possibly to the more distant OmpR and NtrC families as well. |
| Author | Baikalov, I Gunsalus, R P Kaczor-Grzeskowiak, M Dickerson, R E Schröder, I Grzeskowiak, K |
| Author_xml | – sequence: 1 givenname: I surname: Baikalov fullname: Baikalov, I organization: Molecular Biology Institute, University of California, Los Angeles 90095-1570, USA – sequence: 2 givenname: I surname: Schröder fullname: Schröder, I – sequence: 3 givenname: M surname: Kaczor-Grzeskowiak fullname: Kaczor-Grzeskowiak, M – sequence: 4 givenname: K surname: Grzeskowiak fullname: Grzeskowiak, K – sequence: 5 givenname: R P surname: Gunsalus fullname: Gunsalus, R P – sequence: 6 givenname: R E surname: Dickerson fullname: Dickerson, R E |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/8780507$$D View this record in MEDLINE/PubMed |
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| SubjectTerms | Amino Acid Sequence Bacterial Proteins - chemistry Bacterial Proteins - metabolism Binding Sites Crystallography, X-Ray DNA-Binding Proteins - chemistry DNA-Binding Proteins - metabolism Escherichia coli - chemistry Escherichia coli Proteins Models, Molecular Molecular Sequence Data Phosphorylation Protein Conformation Protein Structure, Secondary Recombinant Proteins - chemistry Repressor Proteins Sequence Alignment Trans-Activators |
| Title | Structure of the Escherichia coli response regulator NarL |
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