Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 5.79 kDa 
• Atom Count: 480 
• Residue Count: 51 
• Unique protein chains: 2

3I3Z

Human insulin

• DOI: 10.2210/pdb3I3Z/pdb

• Classification: HORMONE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-07-01 Released: 2010-01-05 
• Deposition Author(s): Timofeev, V.I., Bezuglov, V.V., Miroshnikov, K.A., Cuprov-Netochin, R.N., Samigina, V.R., Kuranova, I.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.195 
• R-Value Work: 0.174 
• R-Value Observed: 0.175 

Literature

X-ray investigation of gene-engineered human insulin crystallized from a solution containing polysialic acid.

Timofeev, V.I., Chuprov-Netochin, R.N., Samigina, V.R., Bezuglov, V.V., Miroshnikov, K.A., Kuranova, I.P.

(2010) Acta Crystallogr Sect F Struct Biol Cryst Commun 66: 259-263

• PubMed: 20208155 
• DOI: 10.1107/S1744309110000461
• Primary Citation of Related Structures:  
  3I3Z, 3I40


• PubMed Abstract: 
  

Attempts to crystallize the noncovalent complex of recombinant human insulin with polysialic acid were carried out under normal and microgravity conditions. Both crystal types belonged to the same space group, I2(1)3, with unit-cell parameters a = b = c = 77.365 A, alpha = beta = gamma = 90.00 degrees. The reported space group and unit-cell parameters are almost identical to those of cubic insulin reported in the PDB. The results of X-ray studies confirmed that the crystals obtained were cubic insulin crystals and that they contained no polysialic acid or its fragments. Electron-density maps were calculated using X-ray diffraction sets from earth-grown and microgravity-grown crystals and the three-dimensional structure of the insulin molecule was determined and refined. The conformation and secondary-structural elements of the insulin molecule in different crystal forms were compared.

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Organizational Affiliation: 

Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, 119333 Moscow, Russia. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Insulin A chain	A	21	Homo sapiens	Mutation(s): 0  Gene Names: INS
Find proteins for P01308 (Homo sapiens) Explore P01308  Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS  P01308

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Insulin B chain	B	30	Homo sapiens	Mutation(s): 0  Gene Names: INS
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: 1.60 Å
• R-Value Free: 0.195 
• R-Value Work: 0.174 
• R-Value Observed: 0.175 
• Space Group: I 2₁ 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.365	α = 90
b = 77.365	β = 90
c = 77.365	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-07-01 
• Released Date: 2010-01-05 
Deposition Author(s): Timofeev, V.I., Bezuglov, V.V., Miroshnikov, K.A., Cuprov-Netochin, R.N., Samigina, V.R., Kuranova, I.P.

Revision History 

• Version 1.0: 2010-01-05
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance