Two-State Allosteric Behavior in a Single-Domain Signaling Protein

Protein actions are usually discussed in terms of static structures, but function requires motion. We find a strong correlation between phosphorylation-driven activation of the signaling protein NtrC and microsecond time-scale backbone dynamics. Using nuclear magnetic resonance relaxation, we charac...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2001-03, Vol.291 (5512), p.2429-2433
Hauptverfasser: Volkman, Brian F., Lipson, Doron, Wemmer, David E., Kern, Dorothee
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container_issue 5512
container_start_page 2429
container_title Science (American Association for the Advancement of Science)
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creator Volkman, Brian F.
Lipson, Doron
Wemmer, David E.
Kern, Dorothee
description Protein actions are usually discussed in terms of static structures, but function requires motion. We find a strong correlation between phosphorylation-driven activation of the signaling protein NtrC and microsecond time-scale backbone dynamics. Using nuclear magnetic resonance relaxation, we characterized the motions of NtrC in three functional states: unphosphorylated (inactive), phosphorylated (active), and a partially active mutant. These dynamics are indicative of exchange between inactive and active conformations. Both states are populated in unphosphorylated NtrC, and phosphorylation shifts the equilibrium toward the active species. These results support a dynamic population shift between two preexisting conformations as the underlying mechanism of activation.
doi_str_mv 10.1126/science.291.5512.2429
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subjects Allosteric Regulation
Amides
Bacterial Proteins
Binding Sites
Biochemistry
Biological and medical sciences
Cell physiology
Cellular signal transduction
Chemical equilibrium
Conformation
Correlations
DNA-Binding Proteins - chemistry
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
Fundamental and applied biological sciences. Psychology
Modeling
Models, Molecular
Molecular and cellular biology
Motion
Mutation
NMR
Nuclear magnetic resonance
Nuclear Magnetic Resonance, Biomolecular
Phosphorylation
PII Nitrogen Regulatory Proteins
Population dynamics
Protein Conformation
Protein Structure, Secondary
Protein Structure, Tertiary
Proteins
Rotation
Signal Transduction
Time
Trans-Activators
Transcription Factors
title Two-State Allosteric Behavior in a Single-Domain Signaling Protein
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