NMR ensemble of Tyrocidine A analogue AC3.27

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 10 
  • Conformers Submitted: 
  • Selection Criteria: structures with acceptable covalent geometry 

wwPDB Validation   3D Report Full Report

This is version 3.0 of the entry. See complete history


Tyrocidine A Analogues Bearing the Planar d-Phe-2-Abz Turn Motif: How Conformation Impacts Bioactivity.

Cameron, A.J.Edwards, P.J.B.Harjes, E.Sarojini, V.

(2017) J Med Chem 60: 9565-9574

  • DOI: https://doi.org/10.1021/acs.jmedchem.7b00953
  • Primary Citation of Related Structures:  
    6B34, 6B35

  • PubMed Abstract: 

    The d-Phe-Pro β-turn of the cyclic β-hairpin antimicrobial decapeptide tyrocidine A, (Tyrc A) was substituted with the d-Phe-2-aminobenzoic acid (2-Abz) motif in a synthetic analogue (1). The NMR structure of 1 demonstrated that compound 1 retained the β-hairpin structure of Tyrc A with additional planarity, resulting in approximately 30-fold reduced hemolysis than Tyrc A. Although antibacterial activity was partially compromised, a single Gln to Lys substitution (2) restored activity equivalent to Tyrc A against S. aureus, enhanced activity against two Gram negative strains and maintained the reduced hemeloysis of 1. Analysis by transmission electron microscopy (TEM) suggested a membrane lytic mechanism of action for these peptides. Compound 2 also exhibits nanomolar antifungal activity in synergy with amphotericin B. The d-Phe-2-Abz turn may serve as a tool for the synthesis of structurally predictable β-hairpin libraries. Unlike traditional β-turn motifs such as d-Pro-Gly, both the 2-Abz and d-Phe rings may be further functionalized.

  • Organizational Affiliation

    School of Chemical Sciences, University of Auckland , Auckland 1142, New Zealand.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrocidine A analogue D-PHE-BE2-PHE-D-PHE-ASN-GLN-TYR-VAL-ORN-LEU10Brevibacillus brevisMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on ORN
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 10 
  • Conformers Submitted: 
  • Selection Criteria: structures with acceptable covalent geometry 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2017-12-27
    Changes: Database references
  • Version 2.0: 2020-08-12
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-06-14
    Changes: Database references, Other
  • Version 3.0: 2023-11-15
    Changes: Atomic model, Data collection, Derived calculations