1S1O

NMR Structure of a D,L Alternating pentadecamer of norleucine: double antiparallel beta-helix

• PDB DOI: https://doi.org/10.2210/pdb1S1O/pdb
• BMRB: 6101

• Classification: DE NOVO PROTEIN
• Mutation(s): No 


• Deposited: 2004-01-07 Released: 2004-02-24 
• Deposition Author(s): Navarro, E., Fennude, E., Celda, B.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 5 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure of a D,L-alternating oligonorleucine as a model of double-stranded antiparallel beta-helix.

Navarro, E., Fenude, E., Celda, B.

(2002) Biopolymers 64: 198-209

• PubMed: 12115137 
• DOI: https://doi.org/10.1002/bip.10172
• Primary Citation of Related Structures:  
  1S1O


• PubMed Abstract: 
  

  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.

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Organizational Affiliation: 

Departamento de Química Física, Facultat de Químicas, Universitat de Valencia, C/Dr. Moliner,50, 46100-Burjassot (Valencia), Spain.

Biological Assembly 1  

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.69 kDa 
• Atom Count: 258 
• Modelled Residue Count: 32 
• Deposited Residue Count: 32 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BOC-L-NLE-(D-NLE-L-NLE)5-D-NLE(METHYL)-L-NLE-D-NLE-L-NLE METHYL ESTER	A, B	16	N/A	Mutation(s): 0

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NLE	A, B	L-PEPTIDE LINKING	C6 H13 N O2		LEU
NLO	A, B	L-PEPTIDE LINKING	C7 H15 N O2		LEU

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 1
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000109	A, B	BOC-L-NLE-(D-NLE-L-NLE)5-D-NLE(METHYL)-L-NLE-D-NLE-L-NLE METHYL ESTER	Polypeptide / Antibiotic

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 5 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-02-24 
Deposition Author(s): Navarro, E., Fennude, E., Celda, B.

Revision History  

• Version 1.0: 2004-02-24
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2012-09-19
  Changes: Non-polymer description, Structure summary
• Version 1.4: 2012-12-12
  Changes: Other
• Version 1.5: 2022-02-09
  Changes: Data collection, Database references, Derived calculations
• Version 2.0: 2023-11-15
  Changes: Atomic model, Data collection, Derived calculations