Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 0.82 kDa 
• Atom Count: 67 
• Residue Count: 7 
• Unique protein chains: 1

3HYD

LVEALYL peptide derived from human insulin chain B, residues 11-17

• DOI: 10.2210/pdb3HYD/pdb

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


• Deposited: 2009-06-22 Released: 2009-10-06 
• Deposition Author(s): Ivanova, M.I., Sawaya, M.R., Eisenberg, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.00 Å
• R-Value Free: 0.180 
• R-Value Work: 0.146 
• R-Value Observed: 0.149 

Literature

Molecular basis for insulin fibril assembly.

Ivanova, M.I., Sievers, S.A., Sawaya, M.R., Wall, J.S., Eisenberg, D.

(2009) Proc Natl Acad Sci U S A 106: 18990-18995

• PubMed: 19864624 
• DOI: 10.1073/pnas.0910080106
• Primary Citation of Related Structures:  
  3HYD


• PubMed Abstract: 
  

In the rare medical condition termed injection amyloidosis, extracellular fibrils of insulin are observed. We found that the segment of the insulin B-chain with sequence LVEALYL is the smallest segment that both nucleates and inhibits the fibrillation of full-length insulin in a molar ratio-dependent manner, suggesting that this segment is central to the cross-beta spine of the insulin fibril. In isolation from the rest of the protein, LVEALYL forms microcrystalline aggregates with fibrillar morphology, the structure of which we determined to 1 A resolution. The LVEALYL segments are stacked into pairs of tightly interdigitated beta-sheets, each pair displaying the dry steric zipper interface typical of amyloid-like fibrils. This structure leads to a model for fibrils of human insulin consistent with electron microscopic, x-ray fiber diffraction, and biochemical studies.

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Organizational Affiliation: 

Howard Hughes Medical Institute, UCLA-DOE Institute for Genomics and Proteomics, Los Angeles CA 90095-1570, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Insulin	A	7	N/A	Mutation(s): 0
Find proteins for P01308 (Homo sapiens) Explore P01308  Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS  P01308

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.00 Å
• R-Value Free: 0.180 
• R-Value Work: 0.146 
• R-Value Observed: 0.149 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.478	α = 90
b = 4.838	β = 96.65
c = 19.442	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-06-22 
• Released Date: 2009-10-06 
Deposition Author(s): Ivanova, M.I., Sawaya, M.R., Eisenberg, D.

Revision History 

• Version 1.0: 2009-10-06
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-11-01
  Changes: Refinement description