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| | ==NMR Structure of a D,L alternating decamer of norleucine: double antiparallel beta-helix== | | ==NMR Structure of a D,L alternating decamer of norleucine: double antiparallel beta-helix== |
| - | <StructureSection load='1s4a' size='340' side='right'caption='[[1s4a]], [[NMR_Ensembles_of_Models | 5 NMR models]]' scene=''> | + | <StructureSection load='1s4a' size='340' side='right'caption='[[1s4a]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1s4a]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S4A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1S4A FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1s4a]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S4A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1S4A FirstGlance]. <br> |
| - | </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=DNE:D-NORLEUCINE'>DNE</scene>, <scene name='pdbligand=DNG:N-FORMYL-D-NORLEUCINE'>DNG</scene>, <scene name='pdbligand=DNM:N-METHYL-D-NORLEUCINE'>DNM</scene>, <scene name='pdbligand=NLE:NORLEUCINE'>NLE</scene>, <scene name='pdbligand=NLO:O-METHYL-L-NORLEUCINE'>NLO</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1r9v|1r9v]], [[1s1o|1s1o]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DNE:D-NORLEUCINE'>DNE</scene>, <scene name='pdbligand=DNG:N-FORMYL-D-NORLEUCINE'>DNG</scene>, <scene name='pdbligand=DNM:N-METHYL-D-NORLEUCINE'>DNM</scene>, <scene name='pdbligand=NLE:NORLEUCINE'>NLE</scene>, <scene name='pdbligand=NLO:O-METHYL-L-NORLEUCINE'>NLO</scene>, <scene name='pdbligand=PRD_000108:HCO-(D-NLE-L-NLE)3-D-MENLE-L-NLE-D-NLE-L-NLE-OME'>PRD_000108</scene></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1s4a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s4a OCA], [http://pdbe.org/1s4a PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1s4a RCSB], [http://www.ebi.ac.uk/pdbsum/1s4a PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1s4a ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1s4a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s4a OCA], [https://pdbe.org/1s4a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1s4a RCSB], [https://www.ebi.ac.uk/pdbsum/1s4a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1s4a ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Celda, B]] | + | [[Category: Celda B]] |
| - | [[Category: Fenude, E]] | + | [[Category: Fenude E]] |
| - | [[Category: Navarro, E]] | + | [[Category: Navarro E]] |
| - | [[Category: Beta-helix]]
| + | |
| - | [[Category: De novo protein]]
| + | |
| - | [[Category: Gramicidin]]
| + | |
| - | [[Category: L-alternating]]
| + | |
| - | [[Category: Norleucine]]
| + | |
| Structural highlights
1s4a is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | Solution NMR |
| Ligands: | , , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Publication Abstract from PubMed
Alternating sequences of D and L residues in peptides are directly related to the formation of several kinds of regular helical conformations usually called beta-helices. The major feature of these structures is that they can be associated with the transmembrane ion-conducting channel activity in some natural antibacterial peptides. The study of alternating D,L synthetic peptides is critical to understand how factors such as surrounding media, main chain length, type of side chain and terminal groups, among others, can determine the adoption of a specific kind of beta-helix. Early studies pointed out that the peptides Boc-(D-NLeu-L-NLeu)(6)-D-MeNLe-L-Nl-D-Nl-L-Nl-OMe (Boc: tert-butyloxycarbonyl) and Boc-L-Nle-(D-Nle-L-Nle)(5)-D-MeNle-L-Nle-D-Nle-L-Nle-OMe adopt in chloroform a unique detectable conformation single beta(4.4)- and double beta(5.6) upward arrow downward arrow -helix, respectively. The influence of terminal groups on the final stable conformation of N-formylated peptides has been studied in this work. The initial basic NMR data analysis of a synthetic alternating D,L-oligopeptide with ten norleucines, N-methylated on the residue 7 and having HCO- and -OMe as terminal groups clearly indicates the coexistence of two different conformations in equilibrium. NMR data and molecular dynamics calculations point to a dimeric antiparallel beta-helix structure beta(5.6) upward arrow downward arrow for the main conformation. On the other hand, NMR data suggest a single beta-helix structure beta(4.4) for the second conformation. Finally, a thermodynamic analysis of the equilibrium between both conformations has been carried out by one-dimensional NMR measurements at ten different temperatures. The temperature at which 50% of dimer conformation is dissociated is 319 K. In addition, the dimer-monomer equilibrium curve obtained shows a DeltaG>0 for the whole range of studied temperatures, and its behavior can be considered similar to the thermodynamic denaturation protein processes.
Conformational and structural analysis of the equilibrium between single- and double-strand beta-helix of a D,L-alternating oligonorleucine.,Navarro E, Fenude E, Celda B Biopolymers. 2004 Feb 5;73(2):229-41. PMID:14755580[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Navarro E, Fenude E, Celda B. Conformational and structural analysis of the equilibrium between single- and double-strand beta-helix of a D,L-alternating oligonorleucine. Biopolymers. 2004 Feb 5;73(2):229-41. PMID:14755580 doi:http://dx.doi.org/10.1002/bip.10549
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