Role of the Unique Peptide Tail in Hyperthermostable Aquifex aeolicus Cochaperonin Protein 10
All known cochaperonin protein 10 (cpn10) molecules are heptamers of seven identical subunits noncovalently linked by β-strand interactions. Cpn10 from the deep-branching, hyperthermophilic bacterium Aquifex aeolicus (Aacpn10) shows high homology with mesophilic and other thermophilic cpn10 sequence...
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Published in | Biochemistry (Easton) Vol. 44; no. 44; pp. 14385 - 14395 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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United States
American Chemical Society
08.11.2005
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Abstract | All known cochaperonin protein 10 (cpn10) molecules are heptamers of seven identical subunits noncovalently linked by β-strand interactions. Cpn10 from the deep-branching, hyperthermophilic bacterium Aquifex aeolicus (Aacpn10) shows high homology with mesophilic and other thermophilic cpn10 sequences, except for a 25-residue C-terminal extension not found in any other cpn10. Prior to atomic structure information, we here address the role of the tail by biophysical means. A tail-lacking variant (Aacpn10-del25) also adopts a heptameric structure in solution and exhibits nativelike substrate-refolding activity. Thermal and chemical perturbations of both Aacpn10 and Aacpn10-del25, probed by far-UV circular dichroism, demonstrate that both proteins have high thermodynamic stability. Heptamer−monomer dissociation midpoints were defined by isothermal titration calorimetry; at 25 °C, the values for Aacpn10 and Aacpn10-del25 are within 2-fold of each other and close to reported midpoints for mesophilic cpn10 proteins. In contrast, the monomer stabilities for the A. aeolicus proteins are significantly higher than those of mesophilic homologues at 30 °C; thus, heptamer thermophily is a result of more stable monomers. Electron microscopy data reveals that Aacpn10-del25 heptamers are prone to stack on top of each other forming chainlike molecules; the electrostatic surface pattern of a structural model can explain this behavior. Taken together, the unique tail in Aacpn10 is not required for heptamer structure, stability, or function; instead, it appears to be an ancient strategy to avoid cochaperonin aggregation at extreme temperatures. |
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AbstractList | All known cochaperonin protein 10 (cpn10) molecules are heptamers of seven identical subunits noncovalently linked by beta-strand interactions. Cpn10 from the deep-branching, hyperthermophilic bacterium Aquifex aeolicus (Aacpn10) shows high homology with mesophilic and other thermophilic cpn10 sequences, except for a 25-residue C-terminal extension not found in any other cpn10. Prior to atomic structure information, we here address the role of the tail by biophysical means. A tail-lacking variant (Aacpn10-del25) also adopts a heptameric structure in solution and exhibits nativelike substrate-refolding activity. Thermal and chemical perturbations of both Aacpn10 and Aacpn10-del25, probed by far-UV circular dichroism, demonstrate that both proteins have high thermodynamic stability. Heptamer-monomer dissociation midpoints were defined by isothermal titration calorimetry; at 25 degrees C, the values for Aacpn10 and Aacpn10-del25 are within 2-fold of each other and close to reported midpoints for mesophilic cpn10 proteins. In contrast, the monomer stabilities for the A. aeolicus proteins are significantly higher than those of mesophilic homologues at 30 degrees C; thus, heptamer thermophily is a result of more stable monomers. Electron microscopy data reveals that Aacpn10-del25 heptamers are prone to stack on top of each other forming chainlike molecules; the electrostatic surface pattern of a structural model can explain this behavior. Taken together, the unique tail in Aacpn10 is not required for heptamer structure, stability, or function; instead, it appears to be an ancient strategy to avoid cochaperonin aggregation at extreme temperatures. All known cochaperonin protein 10 (cpn10) molecules are heptamers of seven identical subunits noncovalently linked by β-strand interactions. Cpn10 from the deep-branching, hyperthermophilic bacterium Aquifex aeolicus (Aacpn10) shows high homology with mesophilic and other thermophilic cpn10 sequences, except for a 25-residue C-terminal extension not found in any other cpn10. Prior to atomic structure information, we here address the role of the tail by biophysical means. A tail-lacking variant (Aacpn10-del25) also adopts a heptameric structure in solution and exhibits nativelike substrate-refolding activity. Thermal and chemical perturbations of both Aacpn10 and Aacpn10-del25, probed by far-UV circular dichroism, demonstrate that both proteins have high thermodynamic stability. Heptamer−monomer dissociation midpoints were defined by isothermal titration calorimetry; at 25 °C, the values for Aacpn10 and Aacpn10-del25 are within 2-fold of each other and close to reported midpoints for mesophilic cpn10 proteins. In contrast, the monomer stabilities for the A. aeolicus proteins are significantly higher than those of mesophilic homologues at 30 °C; thus, heptamer thermophily is a result of more stable monomers. Electron microscopy data reveals that Aacpn10-del25 heptamers are prone to stack on top of each other forming chainlike molecules; the electrostatic surface pattern of a structural model can explain this behavior. Taken together, the unique tail in Aacpn10 is not required for heptamer structure, stability, or function; instead, it appears to be an ancient strategy to avoid cochaperonin aggregation at extreme temperatures. |
Author | Apiyo, David Luke, Kathryn Wittung-Stafshede, Pernilla |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/16262239$$D View this record in MEDLINE/PubMed |
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CitedBy_id | crossref_primary_10_1002_prot_22369 crossref_primary_10_1111_j_1742_4658_2007_05955_x crossref_primary_10_1002_pro_7 crossref_primary_10_1016_j_jmb_2006_08_058 crossref_primary_10_1016_j_abb_2006_10_003 crossref_primary_10_1016_j_jmb_2008_06_021 crossref_primary_10_1002_jmr_803 crossref_primary_10_1140_epje_i2013_13078_y |
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Notes | istex:0BDC0FB649C369A09AF925424EC7B191A26B02AA Support for this project was provided by grants from NIH (GM059663) and the Robert A. Welch Foundation (C-1588). K.L. is supported by a fellowship from an NIH Biotechnology Research Training Grant. ark:/67375/TPS-63WB61GD-6 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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Snippet | All known cochaperonin protein 10 (cpn10) molecules are heptamers of seven identical subunits noncovalently linked by β-strand interactions. Cpn10 from the... All known cochaperonin protein 10 (cpn10) molecules are heptamers of seven identical subunits noncovalently linked by beta-strand interactions. Cpn10 from the... |
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SubjectTerms | Bacteria - chemistry Bacteria - genetics Chaperonin 10 - chemistry Chaperonin 10 - genetics Chaperonin 10 - metabolism Chaperonin 10 - ultrastructure Hot Temperature Models, Molecular Peptides - chemistry Peptides - genetics Peptides - metabolism Protein Structure, Quaternary Protein Structure, Tertiary Protein Subunits - chemistry Protein Subunits - genetics Protein Subunits - metabolism Thermodynamics |
Title | Role of the Unique Peptide Tail in Hyperthermostable Aquifex aeolicus Cochaperonin Protein 10 |
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