Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 17.90 kDa 
• Atom Count: 1256 
• Modelled Residue Count: 168 
• Deposited Residue Count: 168 
• Unique protein chains: 1

2N1E

MAX1 peptide fibril

• PDB DOI: 10.2210/pdb2N1E/pdb
• BMRB: 25558

• Classification: PROTEIN FIBRIL
• Mutation(s): No 


• Deposited: 2015-03-30 Released: 2015-07-29 
• Deposition Author(s): Nagy-Smith, K., Moore, E., Schneider, J., Tycko, R.

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Experimental Data Snapshot

• Method: SOLID-STATE NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: all calculated structures submitted 

Literature

Molecular structure of monomorphic peptide fibrils within a kinetically trapped hydrogel network.

Nagy-Smith, K., Moore, E., Schneider, J., Tycko, R.

(2015) Proc Natl Acad Sci U S A 112: 9816-9821

• PubMed: 26216960 
• DOI: 10.1073/pnas.1509313112
• Primary Citation of Related Structures:  
  2N1E


• PubMed Abstract: 
  

Most, if not all, peptide- and protein-based hydrogels formed by self-assembly can be characterized as kinetically trapped 3D networks of fibrils. The propensity of disease-associated amyloid-forming peptides and proteins to assemble into polymorphic fibrils suggests that cross-β fibrils comprising hydrogels may also be polymorphic. We use solid-state NMR to determine the molecular and supramolecular structure of MAX1, a de novo designed gel-forming peptide, in its fibrillar state. We find that MAX1 adopts a β-hairpin conformation and self-assembles with high fidelity into a double-layered cross-β structure. Hairpins assemble with an in-register Syn orientation within each β-sheet layer and with an Anti orientation between layers. Surprisingly, although the MAX1 fibril network is kinetically trapped, solid-state NMR data show that fibrils within this network are monomorphic and most likely represent the thermodynamic ground state. Intermolecular interactions not available in alternative structural arrangements apparently dictate this monomorphic behavior.

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Organizational Affiliation: 

Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520 [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MAX1 peptide	A, B, C, D, E, F, G, H	21	N/A	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: SOLID-STATE NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: all calculated structures submitted 
• OLDERADO: 2N1E Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-03-30 
• Released Date: 2015-07-29 
Deposition Author(s): Nagy-Smith, K., Moore, E., Schneider, J., Tycko, R.

Revision History  

• Version 1.0: 2015-07-29
  Type: Initial release
  
• Version 1.1: 2015-08-12
  Changes: Database references
• Version 1.2: 2015-08-26
  Changes: Database references