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Trp RNA-Binding Attenuation Protein: Modifying Symmetry and Stability of a Circular Oligomer

Identifieur interne : 002286 ( Main/Exploration ); précédent : 002285; suivant : 002287

Trp RNA-Binding Attenuation Protein: Modifying Symmetry and Stability of a Circular Oligomer

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

Source :

RBID : PMC:3435397

Descripteurs français

English descriptors

Abstract

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.

Methodology/Principal Findings

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.

Conclusions/Significance

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.


Url:
DOI: 10.1371/journal.pone.0044309
PubMed: 22970197
PubMed Central: 3435397


Affiliations:


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<title>Background</title>
<p>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
<italic>Bacilli</italic>
, 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.</p>
</sec>
<sec>
<title>Methodology/Principal Findings</title>
<p>Among the wild type
<italic>B. stearothermophilus</italic>
,
<italic>B. halodurans</italic>
and
<italic>B. subtilis</italic>
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
<italic>B. subtilis</italic>
S72N TRAP.</p>
</sec>
<sec>
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<p>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.</p>
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