Bacillus subtilis class Ib ribonucleotide reductase: high activity and dynamic subunit interactions.
Identifieur interne : 000678 ( Main/Exploration ); précédent : 000677; suivant : 000679Bacillus subtilis class Ib ribonucleotide reductase: high activity and dynamic subunit interactions.
Auteurs : Mackenzie J. Parker [États-Unis] ; Xuling Zhu ; Joanne StubbeSource :
- Biochemistry [ 1520-4995 ] ; 2014.
Descripteurs français
- KwdFr :
- Bacillus subtilis (enzymologie), Biocatalyse (MeSH), Glutarédoxines (composition chimique), Glutarédoxines (génétique), Glutarédoxines (isolement et purification), Manganèse (composition chimique), Oxydoréduction (MeSH), Protéines bactériennes (composition chimique), Protéines recombinantes (composition chimique), Protéines recombinantes (génétique), Protéines recombinantes (isolement et purification), Ribonucleotide reductases (composition chimique), Sous-unités de protéines (composition chimique), Structure quaternaire des protéines (MeSH), Thioredoxin-disulfide reductase (composition chimique), Thioredoxin-disulfide reductase (génétique), Thioredoxin-disulfide reductase (isolement et purification), Thiorédoxines (composition chimique), Thiorédoxines (génétique), Thiorédoxines (isolement et purification).
- MESH :
- composition chimique : Glutarédoxines, Manganèse, Protéines bactériennes, Protéines recombinantes, Ribonucleotide reductases, Sous-unités de protéines, Thioredoxin-disulfide reductase, Thiorédoxines.
- enzymologie : Bacillus subtilis.
- génétique : Glutarédoxines, Protéines recombinantes, Thioredoxin-disulfide reductase, Thiorédoxines.
- isolement et purification : Glutarédoxines, Protéines recombinantes, Thioredoxin-disulfide reductase, Thiorédoxines.
- Biocatalyse, Oxydoréduction, Structure quaternaire des protéines.
English descriptors
- KwdEn :
- Bacillus subtilis (enzymology), Bacterial Proteins (chemistry), Biocatalysis (MeSH), Glutaredoxins (chemistry), Glutaredoxins (genetics), Glutaredoxins (isolation & purification), Manganese (chemistry), Oxidation-Reduction (MeSH), Protein Structure, Quaternary (MeSH), Protein Subunits (chemistry), Recombinant Proteins (chemistry), Recombinant Proteins (genetics), Recombinant Proteins (isolation & purification), Ribonucleotide Reductases (chemistry), Thioredoxin-Disulfide Reductase (chemistry), Thioredoxin-Disulfide Reductase (genetics), Thioredoxin-Disulfide Reductase (isolation & purification), Thioredoxins (chemistry), Thioredoxins (genetics), Thioredoxins (isolation & purification).
- MESH :
- chemical , chemistry : Bacterial Proteins, Glutaredoxins, Manganese, Protein Subunits, Recombinant Proteins, Ribonucleotide Reductases, Thioredoxin-Disulfide Reductase, Thioredoxins.
- enzymology : Bacillus subtilis.
- chemical , genetics : Glutaredoxins, Recombinant Proteins, Thioredoxin-Disulfide Reductase, Thioredoxins.
- chemical , isolation & purification : Glutaredoxins, Recombinant Proteins, Thioredoxin-Disulfide Reductase, Thioredoxins.
- Biocatalysis, Oxidation-Reduction, Protein Structure, Quaternary.
Abstract
The class Ib ribonucleotide reductase (RNR) isolated from Bacillus subtilis was recently purified as a 1:1 ratio of NrdE (α) and NrdF (β) subunits and determined to have a dimanganic-tyrosyl radical (Mn(III)2-Y·) cofactor. The activity of this RNR and the one reconstituted from recombinantly expressed NrdE and reconstituted Mn(III)2-Y· NrdF using dithiothreitol as the reductant, however, was low (160 nmol min(-1) mg(-1)). The apparent tight affinity between the two subunits, distinct from all class Ia RNRs, suggested that B. subtilis RNR might be the protein that yields to the elusive X-ray crystallographic characterization of an "active" RNR complex. We now report our efforts to optimize the activity of B. subtilis RNR by (1) isolation of NrdF with a homogeneous cofactor, and (2) identification and purification of the endogenous reductant(s). Goal one was achieved using anion exchange chromatography to separate apo-/mismetalated-NrdFs from Mn(III)2-Y· NrdF, yielding enzyme containing 4 Mn and 1 Y·/β2. Goal two was achieved by cloning, expressing, and purifying TrxA (thioredoxin), YosR (a glutaredoxin-like thioredoxin), and TrxB (thioredoxin reductase). The success of both goals increased the specific activity to ~1250 nmol min(-1) mg(-1) using a 1:1 mixture of NrdE:Mn(III)2-Y· NrdF and either TrxA or YosR and TrxB. The quaternary structures of NrdE, NrdF, and NrdE:NrdF (1:1) were characterized by size exclusion chromatography and analytical ultracentrifugation. At physiological concentrations (~1 μM), NrdE is a monomer (α) and Mn(III)2-Y· NrdF is a dimer (β2). A 1:1 mixture of NrdE:NrdF, however, is composed of a complex mixture of structures in contrast to expectations.
DOI: 10.1021/bi401056e
PubMed: 24401092
PubMed Central: PMC3985883
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Glutaredoxins (genetics)</term>
<term>Glutaredoxins (isolation & purification)</term>
<term>Manganese (chemistry)</term>
<term>Oxidation-Reduction (MeSH)</term>
<term>Protein Structure, Quaternary (MeSH)</term>
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<term>Recombinant Proteins (genetics)</term>
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<term>Thioredoxins (isolation & purification)</term>
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<term>Glutarédoxines (génétique)</term>
<term>Glutarédoxines (isolement et purification)</term>
<term>Manganèse (composition chimique)</term>
<term>Oxydoréduction (MeSH)</term>
<term>Protéines bactériennes (composition chimique)</term>
<term>Protéines recombinantes (composition chimique)</term>
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<term>Structure quaternaire des protéines (MeSH)</term>
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<term>Thioredoxin-disulfide reductase (génétique)</term>
<term>Thioredoxin-disulfide reductase (isolement et purification)</term>
<term>Thiorédoxines (composition chimique)</term>
<term>Thiorédoxines (génétique)</term>
<term>Thiorédoxines (isolement et purification)</term>
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<term>Thioredoxins</term>
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<term>Protéines recombinantes</term>
<term>Thioredoxin-disulfide reductase</term>
<term>Thiorédoxines</term>
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<front><div type="abstract" xml:lang="en">The class Ib ribonucleotide reductase (RNR) isolated from Bacillus subtilis was recently purified as a 1:1 ratio of NrdE (α) and NrdF (β) subunits and determined to have a dimanganic-tyrosyl radical (Mn(III)2-Y·) cofactor. The activity of this RNR and the one reconstituted from recombinantly expressed NrdE and reconstituted Mn(III)2-Y· NrdF using dithiothreitol as the reductant, however, was low (160 nmol min(-1) mg(-1)). The apparent tight affinity between the two subunits, distinct from all class Ia RNRs, suggested that B. subtilis RNR might be the protein that yields to the elusive X-ray crystallographic characterization of an "active" RNR complex. We now report our efforts to optimize the activity of B. subtilis RNR by (1) isolation of NrdF with a homogeneous cofactor, and (2) identification and purification of the endogenous reductant(s). Goal one was achieved using anion exchange chromatography to separate apo-/mismetalated-NrdFs from Mn(III)2-Y· NrdF, yielding enzyme containing 4 Mn and 1 Y·/β2. Goal two was achieved by cloning, expressing, and purifying TrxA (thioredoxin), YosR (a glutaredoxin-like thioredoxin), and TrxB (thioredoxin reductase). The success of both goals increased the specific activity to ~1250 nmol min(-1) mg(-1) using a 1:1 mixture of NrdE:Mn(III)2-Y· NrdF and either TrxA or YosR and TrxB. The quaternary structures of NrdE, NrdF, and NrdE:NrdF (1:1) were characterized by size exclusion chromatography and analytical ultracentrifugation. At physiological concentrations (~1 μM), NrdE is a monomer (α) and Mn(III)2-Y· NrdF is a dimer (β2). A 1:1 mixture of NrdE:NrdF, however, is composed of a complex mixture of structures in contrast to expectations.</div>
</front>
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<Abstract><AbstractText>The class Ib ribonucleotide reductase (RNR) isolated from Bacillus subtilis was recently purified as a 1:1 ratio of NrdE (α) and NrdF (β) subunits and determined to have a dimanganic-tyrosyl radical (Mn(III)2-Y·) cofactor. The activity of this RNR and the one reconstituted from recombinantly expressed NrdE and reconstituted Mn(III)2-Y· NrdF using dithiothreitol as the reductant, however, was low (160 nmol min(-1) mg(-1)). The apparent tight affinity between the two subunits, distinct from all class Ia RNRs, suggested that B. subtilis RNR might be the protein that yields to the elusive X-ray crystallographic characterization of an "active" RNR complex. We now report our efforts to optimize the activity of B. subtilis RNR by (1) isolation of NrdF with a homogeneous cofactor, and (2) identification and purification of the endogenous reductant(s). Goal one was achieved using anion exchange chromatography to separate apo-/mismetalated-NrdFs from Mn(III)2-Y· NrdF, yielding enzyme containing 4 Mn and 1 Y·/β2. Goal two was achieved by cloning, expressing, and purifying TrxA (thioredoxin), YosR (a glutaredoxin-like thioredoxin), and TrxB (thioredoxin reductase). The success of both goals increased the specific activity to ~1250 nmol min(-1) mg(-1) using a 1:1 mixture of NrdE:Mn(III)2-Y· NrdF and either TrxA or YosR and TrxB. The quaternary structures of NrdE, NrdF, and NrdE:NrdF (1:1) were characterized by size exclusion chromatography and analytical ultracentrifugation. At physiological concentrations (~1 μM), NrdE is a monomer (α) and Mn(III)2-Y· NrdF is a dimer (β2). A 1:1 mixture of NrdE:NrdF, however, is composed of a complex mixture of structures in contrast to expectations.</AbstractText>
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