NMR structure of humanin in 30% TFE solution

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 14 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.4 of the entry. See complete history


Solution structure of humanin, a peptide against Alzheimer's disease-related neurotoxicity.

Benaki, D.Zikos, C.Evangelou, A.Livaniou, E.Vlassi, M.Mikros, E.Pelecanou, M.

(2005) Biochem Biophys Res Commun 329: 152-160

  • DOI: https://doi.org/10.1016/j.bbrc.2005.01.100
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Humanin is a newly identified 24-residue peptide that suppresses neuronal cell death caused by a wide spectrum of familial Alzheimer's disease genes and the beta-amyloid peptide. In this study, NMR and circular dichroism studies of synthetic humanin in aqueous and 30% 2,2,2-trifluoroethanol (TFE) solutions are reported. In aqueous solution, humanin exists predominantly in an unstructured conformation in equilibrium with turn-like structures involving residues Gly5 to Leu10 and Glu15 to Leu18, providing indication of nascent helix. In the less polar environment of 30% TFE, humanin readily adopts helical structure with long-range order spanning residues Gly5 to Leu18. Comparative 3D modeling studies and topology predictions are in qualitative agreement with the experimental findings in both environments. Our studies reveal a flexible peptide in aqueous environment, which is free to interact with possible receptors that mediate its action, but may also acquire a helical conformation necessary for specific interactions and/or passage through membranes.

  • Organizational Affiliation

    Institute of Biology, NCSR Demokritos, 153 10 Athens, Greece.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Humanin24N/AMutation(s): 0 
Find proteins for Q8IVG9 (Homo sapiens)
Explore Q8IVG9 
Go to UniProtKB:  Q8IVG9
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UniProt GroupQ8IVG9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 14 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-02-22
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-02
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection