2M1F

NMR Structure of Antiamoebin I (peptaibol antibiotic) bound to DMPC/DHPC bicelles

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

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Literature

Peptaibol antiamoebin I: spatial structure, backbone dynamics, interaction with bicelles and lipid-protein nanodiscs, and pore formation in context of barrel-stave model.

Shenkarev, Z.O., Paramonov, A.S., Lyukmanova, E.N., Gizatullina, A.K., Zhuravleva, A.V., Tagaev, A.A., Yakimenko, Z.A., Telezhinskaya, I.N., Kirpichnikov, M.P., Ovchinnikova, T.V., Arseniev, A.S.

(2013) Chem Biodivers 10: 838-863

  • DOI: 10.1002/cbdv.201200421
  • Primary Citation of Related Structures:  
    2M1F

  • PubMed Abstract: 

    • Antiamoebin I (Aam-I) is a membrane-active peptaibol antibiotic isolated from fungal species belonging to the genera Cephalosporium, Emericellopsis, Gliocladium, and Stilbella. In comparison with other 16-amino acid-residue peptaibols, e.g., zervamicin IIB (Zrv-IIB), Aam-I possesses relatively weak biological and channel-forming activities ...

    Antiamoebin I (Aam-I) is a membrane-active peptaibol antibiotic isolated from fungal species belonging to the genera Cephalosporium, Emericellopsis, Gliocladium, and Stilbella. In comparison with other 16-amino acid-residue peptaibols, e.g., zervamicin IIB (Zrv-IIB), Aam-I possesses relatively weak biological and channel-forming activities. In MeOH solution, Aam-I demonstrates fast cooperative transitions between right-handed and left-handed helical conformation of the N-terminal (1-8) region. We studied Aam-I spatial structure and backbone dynamics in the membrane-mimicking environment (DMPC/DHPC bicelles)(1) ) by heteronuclear (1) H,(13) C,(15) N-NMR spectroscopy. Interaction with the bicelles stabilizes the Aam-I right-handed helical conformation retaining significant intramolecular mobility on the ms-μs time scale. Extensive ms-μs dynamics were also detected in the DPC and DHPC micelles and DOPG nanodiscs. In contrast, Zrv-IIB in the DPC micelles demonstrates appreciably lesser mobility on the μs-ms time scale. Titration with Mn(2+) and 16-doxylstearate paramagnetic probes revealed Aam-I binding to the bicelle surface with the N-terminus slightly immersed into hydrocarbon region. Fluctuations of the Aam-I helix between surface-bound and transmembrane (TM) state were observed in the nanodisc membranes formed from the short-chain (diC12 : 0) DLPC/DLPG lipids. All the obtained experimental data are in agreement with the barrel-stave model of TM pore formation, similarly to the mechanism proposed for Zrv-IIB and other peptaibols. The observed extensive intramolecular dynamics explains the relatively low activity of Aam-I.

    Organizational Affiliation: 

    Shemyakin & Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya str., 16/10, 117997 Moscow, Russia. zh@nmr.ru



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Antiamoebin IA17Emericellopsis minimaMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
AIB
Query on AIB		AL-PEPTIDE LINKINGC4 H9 N O2ALA
HYP
Query on HYP		AL-PEPTIDE LINKINGC5 H9 N O3PRO
PHL
Query on PHL		AL-PEPTIDE LINKINGC9 H13 N OPHE
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 1
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000161
Query on PRD_000161		AAntiamoebin 1Peptaibol /  Antibiotic Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 
  • OLDERADO: 2M1F Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-12
    Type: Initial release
  • Version 1.1: 2013-10-02
    Changes: Database references