Triangular trimer of beta-hairpins derived from Abeta17-36 with an F20Cha mutation

Experimental Data Snapshot

  • Resolution: 2.81 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.275 

wwPDB Validation   3D Report Full Report

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Phenylalanine Mutation to Cyclohexylalanine Facilitates Triangular Trimer Formation by beta-Hairpins Derived from A beta.

Haerianardakani, S.Kreutzer, A.G.Salveson, P.J.Samdin, T.D.Guaglianone, G.E.Nowick, J.S.

(2020) J Am Chem Soc 142: 20708-20716

  • DOI: https://doi.org/10.1021/jacs.0c09281
  • Primary Citation of Related Structures:  
    7JXN, 7JXO

  • PubMed Abstract: 

    Oligomers of the β-amyloid peptide, Aβ, play a central role in the pathogenesis and progression of Alzheimer's disease. Trimers and higher-order oligomers composed of trimers are thought to be the most neurotoxic Aβ oligomers. To gain insights into the structure and assembly of Aβ oligomers, our laboratory has previously designed and synthesized macrocyclic peptides derived from Aβ 17-23 and Aβ 30-36 that fold to form β-hairpins and assemble to form trimers. In this study, we found that mutating Phe 20 to cyclohexylalanine (Cha) in macrocyclic Aβ-derived peptides promotes crystallization of an Aβ-derived peptide containing the Aβ 24-29 loop (peptide 3 F20Cha ) and permits elucidation of its structure and assembly by X-ray crystallography. X-ray crystallography shows that peptide 3 F20Cha forms a hexamer. X-ray crystallography and SDS-PAGE further show that trimer 4 F20Cha , a covalently stabilized trimer derived from peptide 3 F20Cha , forms a dodecamer. Size exclusion chromatography shows that trimer 4 F20Cha forms higher-order assemblies in solution. Trimer 4 F20Cha exhibits cytotoxicity against the neuroblastoma cell line SH-SY5Y. These studies demonstrate the use of the F20Cha mutation to further stabilize oligomers of Aβ-derived peptides that contain more of the native sequence and thus better mimic the oligomers formed by full-length Aβ.

  • Organizational Affiliation

    Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amyloid-beta 17-36 peptide
A, B, C
21Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05067 (Homo sapiens)
Explore P05067 
Go to UniProtKB:  P05067
PHAROS:  P05067
GTEx:  ENSG00000142192 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05067
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  2 Unique
IDChains TypeFormula2D DiagramParent
Query on H7V
A, B, C
Query on ORN
A, B, C
Experimental Data & Validation

Experimental Data

  • Resolution: 2.81 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.275 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.141α = 90
b = 65.141β = 90
c = 51.956γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM097562

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-09
    Type: Initial release
  • Version 1.1: 2020-12-23
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Database references, Refinement description