Tachyplesin I Wild type peptide NMR Structure

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 31 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Solution and micelle-bound structures of tachyplesin I and its active aromatic linear derivatives

Laederach, A.Andreotti, A.H.Fulton, D.B.

(2002) Biochemistry 41: 12359-12368

  • DOI: https://doi.org/10.1021/bi026185z
  • Primary Citation of Related Structures:  
    1MA2, 1MA4, 1MA5, 1MA6

  • PubMed Abstract: 

    Tachyplesin I is a 17-residue peptide isolated from the horseshoe crab, Tachypleus tridentatus. It has high antimicrobial activity and adopts a beta-hairpin conformation in solution stabilized by two cross-strand disulfide bonds. We report an NMR structural investigation of wild-type tachyplesin I and three linear derivatives (denoted TPY4, TPF4, and TPA4 in which the bridging cysteine residues are uniformly replaced with tyrosine, phenylalanine, and alanine, respectively). The three-dimensional aqueous solution structures of the wild type and the active variant TPY4 reveal very similar beta-hairpin conformations. In contrast, the inactive variant TPA4 is unstructured in solution. The arrangement of the tyrosine side chains in the TPY4 structure suggests that the beta-hairpin is stabilized by aromatic ring stacking interactions. This is supported by experiments in which the beta-hairpin structure of TPF4 is disrupted by the addition of phenol, but not by the addition of an equimolar amount of cyclohexanol. We have also determined the structures of wild-type tachyplesin I and TPY4 in the presence of dodecylphosphocholine micelles. Both peptides undergo significant conformational rearrangement upon micelle association. Analysis of the micelle-associated peptide structures shows an increased level of exposure of specific hydrophobic side chains and an increased hydrophobic integy moment. Comparison of the structures in micelle and aqueous solution for both wild-type tachyplesin I and TPY4 reveals two requirements for high antimicrobial activity: a beta-hairpin fold in solution and the ability to rearrange critical side chain residues upon membrane association.

  • Organizational Affiliation

    Program of Bioinformatics and Computational Biology, Department of Chemical Engineering, Iowa State University, Ames, Iowa 50011, USA.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tachyplesin I17N/AMutation(s): 0 
Find proteins for P14213 (Tachypleus tridentatus)
Explore P14213 
Go to UniProtKB:  P14213
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14213
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 31 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-10-16
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations