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Trp RNA-binding attenuation protein: modifying symmetry and stability of a circular oligomer.

Identifieur interne : 001C25 ( PubMed/Checkpoint ); précédent : 001C24; suivant : 001C26

Trp RNA-binding attenuation protein: modifying symmetry and stability of a circular oligomer.

Auteurs : Oliver W. Bayfield [Royaume-Uni] ; Chao-Sheng Chen ; Andrea R. Patterson ; Weisha Luan ; Callum Smits ; Paul Gollnick ; Alfred A. Antson

Source :

RBID : pubmed:22970197

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English descriptors

Abstract

Subunit number is amongst the most important structural parameters that determine size, symmetry and geometry of a circular protein oligomer. The L-tryptophan biosynthesis regulator, TRAP, present in several Bacilli, is a good model system for investigating determinants of the oligomeric state. A short segment of C-terminal residues defines whether TRAP forms an 11-mer or 12-mer assembly. To understand which oligomeric state is more stable, we examine the stability of several wild type and mutant TRAP proteins.

DOI: 10.1371/journal.pone.0044309
PubMed: 22970197


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pubmed:22970197

Le document en format XML

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<term>Bacterial Proteins (metabolism)</term>
<term>Crystallography, X-Ray</term>
<term>Kinetics</term>
<term>Mass Spectrometry</term>
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<term>Tryptophan (metabolism)</term>
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<term>Bacillus subtilis (métabolisme)</term>
<term>Cinétique</term>
<term>Cristallographie aux rayons X</term>
<term>Facteurs de transcription ()</term>
<term>Facteurs de transcription (métabolisme)</term>
<term>Liaison aux protéines</term>
<term>Protéines bactériennes ()</term>
<term>Protéines bactériennes (métabolisme)</term>
<term>Protéines de liaison à l'ARN ()</term>
<term>Protéines de liaison à l'ARN (métabolisme)</term>
<term>Protéines mutantes ()</term>
<term>Protéines mutantes (métabolisme)</term>
<term>Sous-unités de protéines ()</term>
<term>Spectrométrie de masse</term>
<term>Stabilité protéique</term>
<term>Structure quaternaire des protéines</term>
<term>Structure secondaire des protéines</term>
<term>Température de transition</term>
<term>Tryptophane (métabolisme)</term>
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<term>Mutant Proteins</term>
<term>Protein Subunits</term>
<term>RNA-Binding Proteins</term>
<term>Transcription Factors</term>
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<term>Bacillus subtilis</term>
<term>Bacterial Proteins</term>
<term>Mutant Proteins</term>
<term>RNA-Binding Proteins</term>
<term>Transcription Factors</term>
<term>Tryptophan</term>
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<term>Bacillus subtilis</term>
<term>Facteurs de transcription</term>
<term>Protéines bactériennes</term>
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<term>Tryptophane</term>
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<term>Kinetics</term>
<term>Mass Spectrometry</term>
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<term>Protein Stability</term>
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<term>Protein Structure, Secondary</term>
<term>Transition Temperature</term>
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<term>Cristallographie aux rayons X</term>
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<term>Protéines bactériennes</term>
<term>Protéines de liaison à l'ARN</term>
<term>Protéines mutantes</term>
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<term>Stabilité protéique</term>
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<front>
<div type="abstract" xml:lang="en">Subunit number is amongst the most important structural parameters that determine size, symmetry and geometry of a circular protein oligomer. The L-tryptophan biosynthesis regulator, TRAP, present in several Bacilli, is a good model system for investigating determinants of the oligomeric state. A short segment of C-terminal residues defines whether TRAP forms an 11-mer or 12-mer assembly. To understand which oligomeric state is more stable, we examine the stability of several wild type and mutant TRAP proteins.</div>
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<Day>01</Day>
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<ArticleTitle>Trp RNA-binding attenuation protein: modifying symmetry and stability of a circular oligomer.</ArticleTitle>
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<AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">Subunit number is amongst the most important structural parameters that determine size, symmetry and geometry of a circular protein oligomer. The L-tryptophan biosynthesis regulator, TRAP, present in several Bacilli, is a good model system for investigating determinants of the oligomeric state. A short segment of C-terminal residues defines whether TRAP forms an 11-mer or 12-mer assembly. To understand which oligomeric state is more stable, we examine the stability of several wild type and mutant TRAP proteins.</AbstractText>
<AbstractText Label="METHODOLOGY/PRINCIPAL FINDINGS" NlmCategory="RESULTS">Among the wild type B. stearothermophilus, B. halodurans and B. subtilis TRAP, we find that the former is the most stable whilst the latter is the least. Thermal stability of all TRAP is shown to increase with L-tryptophan concentration. We also find that mutant TRAP molecules that are truncated at the C-terminus - and hence induced to form 12-mers, distinct from their 11-mer wild type counterparts--have increased melting temperatures. We show that the same effect can be achieved by a point mutation S72N at a subunit interface, which leads to exclusion of C-terminal residues from the interface. Our findings are supported by dye-based scanning fluorimetry, CD spectroscopy, and by crystal structure and mass spectrometry analysis of the B. subtilis S72N TRAP.</AbstractText>
<AbstractText Label="CONCLUSIONS/SIGNIFICANCE" NlmCategory="CONCLUSIONS">We conclude that the oligomeric state of a circular protein can be changed by introducing a point mutation at a subunit interface. Exclusion (or deletion) of the C-terminus from the subunit interface has a major impact on properties of TRAP oligomers, making them more stable, and we argue that the cause of these changes is the altered oligomeric state. The more stable TRAP oligomers could be used in potential applications of TRAP in bionanotechnology.</AbstractText>
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<ForeName>Oliver W</ForeName>
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