1G8C

STRUCTURE OF THE BOVINE ANTIMICROBIAL PEPTIDE INDOLICIDIN BOUND TO SODIUM DODECYL SULFATE MICELLES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the least restraint violations,structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the bovine antimicrobial peptide indolicidin bound to dodecylphosphocholine and sodium dodecyl sulfate micelles.

Rozek, A.Friedrich, C.L.Hancock, R.E.

(2000) Biochemistry 39: 15765-15774

  • Primary Citation of Related Structures:  
    1G89, 1G8C

  • PubMed Abstract: 

    Indolicidin is a cationic, 13-residue antimicrobial peptide (ILPWKWPWWPWRR-NH(2)) which is unusually rich in tryptophan and proline. Its antimicrobial action involves the bacterial cytoplasmic membrane. Fluorescence and circular dichroism spectra demonstrated the structural similarity of indolicidin in complexes with large unilamellar phospolipid vesicles and with detergent micelles. The structure of indolicidin bound to zwitterionic dodecylphosphocholine (DPC) and anionic sodium dodecyl sulfate (SDS) micelles was determined using NMR methods and shown to represent a unique membrane-associated peptide structure. The backbone structure in DPC, well defined between residues 3 and 11, was extended, with two half-turns at residues Lys-5 and Trp-8. The backbone structure in SDS, well defined between residues 5 and 11, was also extended, but lacked the bend in the C-terminal half. Indolicidin in complexes with DPC had a central hydrophobic core composed of proline and tryptophan, which was bracketed by positively charged regions near the peptide termini. The tryptophan side chains, with one exception, folded flat against the peptide backbone, thus giving the molecule a wedge shape. Indolicidin in complexes with SDS had an arrangement of hydrophobic and cationic regions similar to that found in the presence of DPC. The tryptophan side chains were less well defined than for indolicidin in DPC and extended away from the peptide backbone. The preferred location of indolicidin in DPC micelles and lipid bilayers, analyzed using spin-label probes, was at the membrane interface.


  • Organizational Affiliation

    Department of Microbiology and Immunology, University of British Columbia, #300-6174 University Boulevard, Vancouver, British Columbia V6T 1Z3, Canada.


Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INDOLICIDIN14N/AMutation(s): 0 
UniProt
Find proteins for P33046 (Bos taurus)
Explore P33046 
Go to UniProtKB:  P33046
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33046
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the least restraint violations,structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-11-29
    Type: Initial release
  • Version 1.1: 2008-04-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Database references, Derived calculations