Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another.
Most enolases are homodimers. There are a few that are octamers, with the eight subunits arranged as a tetramer of dimers. These dimers have the same basic fold and same subunit interactions as are found in the dimeric enolases. The dissociation of the octameric enolase from S. pyogenes was examined...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2010-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC2809091?pdf=render |
| _version_ | 1811203611396407296 |
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| author | Farhad Karbassi Veronica Quiros Vijay Pancholi Mary J Kornblatt |
| author_facet | Farhad Karbassi Veronica Quiros Vijay Pancholi Mary J Kornblatt |
| author_sort | Farhad Karbassi |
| collection | DOAJ |
| description | Most enolases are homodimers. There are a few that are octamers, with the eight subunits arranged as a tetramer of dimers. These dimers have the same basic fold and same subunit interactions as are found in the dimeric enolases. The dissociation of the octameric enolase from S. pyogenes was examined, using NaClO(4), a weak chaotrope, to perturb the quaternary structure. Dissociation was monitored by sedimentation velocity. NaClO(4) dissociated the octamer into inactive monomers. There was no indication that dissociation of the octamer into monomers proceeded via formation of significant amounts of dimer or any other intermediate species. Two mutations at the dimer-dimer interface, F137L and E363G, were introduced in order to destabilize the octameric structure. The double mutant was more easily dissociated than was the wild type. Dissociation could also be produced by other salts, including tetramethylammonium chloride (TMACl) or by increasing pH. In all cases, no significant amounts of dimers or other intermediates were formed. Weakening one interface in this protein weakened the other interface as well. Although enolases from most organisms are dimers, the dimeric form of the S. pyogenes enzyme appears to be unstable. |
| first_indexed | 2024-04-12T02:58:16Z |
| format | Article |
| id | doaj.art-3c4a5207a2ce4e21ad96a28c78831560 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-12T02:58:16Z |
| publishDate | 2010-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-3c4a5207a2ce4e21ad96a28c788315602022-12-22T03:50:44ZengPublic Library of Science (PLoS)PLoS ONE1932-62032010-01-0151e881010.1371/journal.pone.0008810Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another.Farhad KarbassiVeronica QuirosVijay PancholiMary J KornblattMost enolases are homodimers. There are a few that are octamers, with the eight subunits arranged as a tetramer of dimers. These dimers have the same basic fold and same subunit interactions as are found in the dimeric enolases. The dissociation of the octameric enolase from S. pyogenes was examined, using NaClO(4), a weak chaotrope, to perturb the quaternary structure. Dissociation was monitored by sedimentation velocity. NaClO(4) dissociated the octamer into inactive monomers. There was no indication that dissociation of the octamer into monomers proceeded via formation of significant amounts of dimer or any other intermediate species. Two mutations at the dimer-dimer interface, F137L and E363G, were introduced in order to destabilize the octameric structure. The double mutant was more easily dissociated than was the wild type. Dissociation could also be produced by other salts, including tetramethylammonium chloride (TMACl) or by increasing pH. In all cases, no significant amounts of dimers or other intermediates were formed. Weakening one interface in this protein weakened the other interface as well. Although enolases from most organisms are dimers, the dimeric form of the S. pyogenes enzyme appears to be unstable.http://europepmc.org/articles/PMC2809091?pdf=render |
| spellingShingle | Farhad Karbassi Veronica Quiros Vijay Pancholi Mary J Kornblatt Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another. PLoS ONE |
| title | Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another. |
| title_full | Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another. |
| title_fullStr | Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another. |
| title_full_unstemmed | Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another. |
| title_short | Dissociation of the octameric enolase from S. pyogenes--one interface stabilizes another. |
| title_sort | dissociation of the octameric enolase from s pyogenes one interface stabilizes another |
| url | http://europepmc.org/articles/PMC2809091?pdf=render |
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