1MA6

TPY4 Tachyplesin I tyrosine mutant in the presence of dodecylphosphocholine micelles (300 mM)


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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

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

(2002) Biochemistry 41: 12359-12368

  • Primary Citation of Related Structures:  

  • 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 str ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tachyplesin I
A
17Tachypleus tridentatusMutation(s): 4 
Find proteins for P14213 (Tachypleus tridentatus)
Go to UniProtKB:  P14213
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 31 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1MA6 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-10-16
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance