4GBK

Crystal structure of aspart insulin at pH 8.5

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

A T3R3 hexamer of the human insulin variant B28Asp.

Palmieri, L.C., Favero-Retto, M.P., Lourenco, D., Lima, L.M.

(2013) Biophys Chem 173: 1-7

  • DOI: 10.1016/j.bpc.2013.01.003
  • Primary Citation of Related Structures:  
    4GBI, 4GBK, 4GBL, 4GBN, 4GBC

  • PubMed Abstract: 

    • Insulin shows a complex equilibrium between monomers and hexamers, involving varying conformers and association states. We sought to perform a structural characterization of the fast-acting human insulin variant B28Asp ("aspart"). Small-angle X-ray scattering measurements reveal similar globular behavior in both the aspart and regular human insulin, with a Rg of 19Å and a Dmax of approximately 50Å, indicating similar mean quaternary assembly distribution ...

    Insulin shows a complex equilibrium between monomers and hexamers, involving varying conformers and association states. We sought to perform a structural characterization of the fast-acting human insulin variant B28Asp ("aspart"). Small-angle X-ray scattering measurements reveal similar globular behavior in both the aspart and regular human insulin, with a Rg of 19Å and a Dmax of approximately 50Å, indicating similar mean quaternary assembly distribution. Crystallographic assays revealed a T3R3 assembly of the aspart insulin formed by the TR dimer in the asymmetric unit, with all the first 8 residues of the B chain in the R-state monomer in helical conformation and the participation of its B3Asn in the stabilization of the hexamer. Our data provide access to novel structural information on aspart insulin such as an aspart insulin dimer in solution, the aspart insulin in T conformation and a pure R-state conformer establishing a T3R3 assembly, providing further insight on the stepwise conformational transition and assembly of this fast-insulin.

    Organizational Affiliation: 

    School of Pharmacy, Federal University of Rio de Janeiro - UFRJ. CCS, Bss34, Ilha do Fundão, 21941-590, Rio de Janeiro, RJ, Brazil.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin A chain A, C21Homo sapiensMutation(s): 0 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS:  P01308
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin B chain B, D30Homo sapiensMutation(s): 1 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS:  P01308
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.5α = 90
b = 77.5β = 90
c = 37.6γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
MAR345data collection

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-12
    Type: Initial release
  • Version 1.1: 2017-11-15
    Changes: Refinement description
  • Version 1.2: 2018-08-22
    Changes: Data collection, Database references, Structure summary