4G14

Crystal structure of samarosporin I at 293K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.09 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.120 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of samarosporin I at atomic resolution.

Gessmann, R.Axford, D.Evans, G.Bruckner, H.Petratos, K.

(2012) J.Pept.Sci. 18: 678-684

  • DOI: 10.1002/psc.2454
  • Primary Citation of Related Structures:  4G13

  • PubMed Abstract: 
  • The atomic resolution structures of samarosporin I have been determined at 100 and 293 K. This is the first crystal structure of a natural 15-residue peptaibol. The amino acid sequence in samarosporin I is identical to emerimicin IV and stilbellin I. ...

    The atomic resolution structures of samarosporin I have been determined at 100 and 293 K. This is the first crystal structure of a natural 15-residue peptaibol. The amino acid sequence in samarosporin I is identical to emerimicin IV and stilbellin I. Samarosporin is a peptide antibiotic produced by the ascomycetous fungus Samarospora rostrup and belongs to peptaibol subfamily 2. The structures at both temperatures are very similar to each other adopting mainly a 3₁₀-helical and a minor fraction of α-helical conformation. The helices are significantly bent and packed in an antiparallel fashion in the centered monoclinic lattice leaving among them an approximately 10-Å channel extending along the crystallographic twofold axis. Only two ordered water molecules per peptide molecule were located in the channel. Comparisons have been carried out with crystal structures of subfamily 2 16-residue peptaibols antiamoebin and cephaibols. The repercussion of the structural analysis of samarosporin on membrane function is discussed.


    Organizational Affiliation

    IMBB-FORTH, N. Plastira 100, Heraklion 70013, Greece.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SAMAROSPORIN I
A
16N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000920
Query on PRD_000920
ASAMAROSPORIN IPeptaibol / Antibiotic

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.09 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.120 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 46.280α = 90.00
b = 9.170β = 116.59
c = 25.250γ = 90.00
Software Package:
Software NamePurpose
xia2data scaling
SHELXL-97refinement
xia2data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-03
    Type: Initial release
  • Version 1.1: 2012-10-31
    Type: Database references
  • Version 1.2: 2012-12-26
    Type: Database references, Structure summary