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| | {{STRUCTURE_1s1o| PDB=1s1o | SCENE= }} | | {{STRUCTURE_1s1o| PDB=1s1o | SCENE= }} |
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| - | '''NMR Structure of a D,L Alternating pentadecamer of norleucine: double antiparallel beta-helix'''
| + | ===NMR Structure of a D,L Alternating pentadecamer of norleucine: double antiparallel beta-helix=== |
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| - | ==Overview==
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| - | Conformational characteristics of alternating D,L linear peptides are of particular interest because of their capacity to form transmembrane channels with different transport properties, as some natural antibiotics do. Single- and double-stranded beta-helical structures are common for alternating D,L peptides. The stability of the beta-helix depends on several structural factors, such as the backbone peptide length, type and position of side chains, and nature of terminal groups. The NMR and molecular dynamics solution conformation of a synthetic alternating D,L-oligopeptide with 15 norleucines (XVMe) has been used as a model to get insight in to the conformational features of double-stranded beta-helix structures. The NH chemical shift values (delta(NH)) and long-range nuclear Overhauser effects (NOE) cross peaks, in particular interstrand connectivities, clearly point to an antiparallel double-stranded beta-helix for the XVMe major conformation in solution. An extensive set of distances (from NOE cross peaks) and H-bonds (from delta(NH)) has been included in the molecular dynamics calculations. The experimental NMR data and theoretical calculations clearly indicate that the most probable conformation of XVMe in solution is a double-strand antiparallel beta(5.6) increasing decreasing-helix structure.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_12115137}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 12115137 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_12115137}} |
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| | ==About this Structure== | | ==About this Structure== |
| - | Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S1O OCA]. | + | Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S1O OCA]. |
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| | ==Reference== | | ==Reference== |
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| | [[Category: Gramicidin]] | | [[Category: Gramicidin]] |
| | [[Category: Norleucine]] | | [[Category: Norleucine]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 08:11:08 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 06:27:53 2008'' |
Revision as of 03:27, 28 July 2008
Template:STRUCTURE 1s1o
NMR Structure of a D,L Alternating pentadecamer of norleucine: double antiparallel beta-helix
Template:ABSTRACT PUBMED 12115137
About this Structure
Full experimental information is available from OCA.
Reference
Solution structure of a D,L-alternating oligonorleucine as a model of double-stranded antiparallel beta-helix., Navarro E, Fenude E, Celda B, Biopolymers. 2002 Aug 5;64(4):198-209. PMID:12115137
Page seeded by OCA on Mon Jul 28 06:27:53 2008
