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 
  • R-Value Observed: 0.123 

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This is version 1.3 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, 4G14

  • 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. Samarosporin is a peptide antibiotic produced by the ascomycetous fungus Samarospora rostrup and belongs to peptaibol subfamily 2 ...

    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   |   3D Structure  

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SAMAROSPORIN IA16N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
AIB
Query on AIB
A L-PEPTIDE LINKINGC4 H9 N O2ALA
HYP
Query on HYP
A L-PEPTIDE LINKINGC5 H9 N O3PRO
PHL
Query on PHL
A L-PEPTIDE LINKINGC9 H13 N OPHE
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 1
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000920
Query on PRD_000920
ASAMAROSPORIN IPeptaibol / Antibiotic Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.09 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.123 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.28α = 90
b = 9.17β = 116.59
c = 25.25γ = 90
Software Package:
Software NamePurpose
SHELXL-97refinement
xia2data reduction
xia2data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-03
    Type: Initial release
  • Version 1.1: 2012-10-31
    Changes: Database references
  • Version 1.2: 2012-12-26
    Changes: Database references, Structure summary
  • Version 1.3: 2018-07-18
    Changes: Data collection, Database references